# Physics Exam

force
what is the cause of an acceleration or a change in objects motion
contact force
What force arises from direct physical contact between two objects
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field force
what forces exists between objects even in the absence of direct physical contact
velocity
what is the tendency of an object to maintain its state of motion
the object with greater mass will experience a smaller acceleration and the object with less mass will experience a greater acceleration.
according to Newton’s second law, when the same force is applied to two objects of different masses,
the hammer exerts a force on the nail; the nail exerts a force on the hammer
a hammer drives a nail into a piece of wood. Identify an action-reaction pair, and compare the forces exerted by each object
third
The statement by Newton that for every action there is an equal but opposite reaction is which of his laws of motion
action-reaction pairs
What is simultaneous equal but opposite forces resulting from the interaction of two objects
weight
The magnitude of te force of gravity acting on an object is
mass
a measure of the quantity of matter is
force diagram
A diagram of the object involved in a situation and the forces exerted in the object
Net External Force
The total force resulting from a combo of external forces o an object
equilibrium
the state in which there is no change in a body’s motion
strong nuclear force
the force that holds the nucleus together it is the strongest of the 4 forces
weak force
a form of electromagnetic force and it only acts over small distances
newtons first law
an object with no net force acting on it moving at constant velocity
Termicna Velocity
the constant velocity reached by a falling object when the air resistance equals the downward force of gravity
contact force
a force that arises from the physical contact of 2 objects
vector
what is a physical quantity that has a magnitude and direction
scalar
the speed of a snail is a
scalar
the time it takes to run a mile is a
scalar
what is a physical quantity that has a magnitude but no direction
velocity
what is an example of a vector quantity
scalar
the number of leaves on a tree is a
vectors
multiplying or dividing vectors by scalars results in
positive x-axis pointing east; positive y-axis pointing north
what is the best coordinate system to analyze a car traveling northeast from one city to another
boldface
vectors are represented in a diagram by
component
the projection of a vector along the aces of a coordinate system called a
mechanics
what is an area of physics that studies motion and its causes
thermodynamics
what is an area of physics that studies hear and temperature
vibration and wave phenomena
thermodynamics
a baker makes a load of bread. Identify the area of physics this involves
electormagnetism
a hiker uses a compass to navigate through the woods. What area of physics does this involve
by experiments
according to the scientific method, how does a physicist formulate and objectively test hypotheses
interpreting results
in the steps of the scientific method, what is the next step after formulating and objectively testing hypotheses
in a form that can be evaluated by others
according to the scientific method, how should conclusions be stated
measure an event or situation
diagrams are not designed to
models manipulate a single variable or factor in an experiment
this states meant about models is not correct
length and time
what two dimensions, in addition to mass, are commonly used by physicists to derive additional measurements
millimeter
the symbol ‘mm’ represents a
mm,cm,m,and km
the symbols for units of length in order from smallest to largest are
kilogram
the SI base unit used to measure mass is the
1 second
the SI base unit for time is
meter
the most appropriate SI unit for measuring the length of an automobile is the
precise but not accurate
if some measurements agree closely with each other but differ widely from the actual value, these measurements are
precise
these vaules were obtained as the mass of a bar of metal: 8.83 g;8.84 g; 8.82 g. The known mass is 10.68 g. The vaules are
accurately
In a game of horseshoes, one lands on the post. Four horseshoes land nowhere near the post. The one horseshoe on the post was thrown
straight down
a piece of chalk is dropped by a teacher at a speed of 1.5m/s. From the teachers perspective, the chalk appears to fall
+30 m/s east
what is another way of saying -30 m/s west
components of a vector
The projectiles of a vector along the areas of a coordinate system are called
1930 km at 37 degrees
A plane travels from Huston, TX to washington D.C. which is 1540 km east and 1160 km north of Huston. What is the total displacement of the plane
7.5 m/s south
For winter a duck flies 10.0 m/s due south against a gust of wind with a velocity of 2.5 m/s. What is the resultant velocity of the duck
0.00 m/s
A lightning bug flies at a velocity 0.25 m/s due east toward another lightning bug seen off in the distance. A ligh easterly breeze blows on the bug at a velocity of 0.25 m/s. What is the resultant velocity of the lightning bug?
13.0 blocks
a jogger runs 10.0 blocks due east, 5.0 blocks due south and another 2.0 blocks due east. Assume all blocks are of equal size. Use the graphical method to find the magnitude of the jogger’s net displacement
12 m
a cave explorer travels 3.0 m eastward, then 2.5 m northward and finally 15 m westward. Use the graphical method to find the magnitude of the net displacement
200
A student adds two vectors with magnitudes of 200 and 40. Taking into account significant figures, which is the only possible choice for the magnitude of the resultant?
43 m
a quarterback takes the ball from the line of scrimmage and runs backward for -1.0×10(1) m then sideways parallel to the line of scrimmage for 15 m. The ball s thrown forward 5.0×10(1) m perpendicular to the line of scrimmage. The receiver is tackled immediately. How far is the football displaced from its original position
45.6 m at 9.5 east of south
while following directions on a treasure map, a person walks 45.0 m south, then turns and walks 7.50 m east. Which single straight line displacement could the treasure hunter have walked to reach the same spot?
95 m; 55 m
an athlete runs 110 m across a level field at an angle of 30.0 degrees north of east. What are the east and north components, receptively, of this displacement
23.5 m; 8.55 m
A skateboarder rolls 25.0 m down a hill that descends at an angle of 20.0 degrees with a horizontal. Find the horizontal and vertical components of the skateboarder’s displacement
248 units 53.9 degrees north of east
find the resultant vector of these two vectors: 2.00 x 10(2) unitys due east and 4.00×10(2) units 30.0 degrees north of west
95.16 km/hr east
How fast must a truck travel to stay beneath an airplane that is moving 105 km/hr at an angle of 25 degrees to the ground?
23 km
a truck driver attempting to deliver some furniture ravels 8 km east, turns around and travels 3 km west and then travels 12 km east to his destination. What distance has the driver traveled
108 m/s
If this vessel were to undergo an average acceleration of 1.80 m/s squared, it would go from rest to its top speed in 1.00 min what will t speed be after the minute? Calculate the answer in meters per second
32 m
a shopping cart given an initial velocity of 2.0 m/s undergoes a constant acceleration of 3.0 m/s squared. what is the magnitude of the carts displacement after the first 4.0 s of its motion?
23 m/s
in 1935, a french destroyer, La Terrible, attained on eof the fastest speeds for any standard warship. Suppose it took 2.0 min at a constant acceleration of 0.19 m/s squared for the ship to reach its top speed after staring from rest. Calculate the ships final speed in m/s
5.7×10 cubed m
the Boeing 747 can carry more than 560 passengers and has a maximum speed of about 9.70×10 squared km/hr. After takeoff, the plane takes a certain time to reach its maximum speed. Suppose the plane has a constant acceleration with a magnitude of 4.8 m/s squared. What distance does the plane travel between the moment its speed is 50.0 percent of maciumum and the moment its maximum speed it attained
1.5 m/s squared
in 1991, four English teenagers build an eletic car that could attain a speed 30.0 m/s. Suppose it takes 8.0 s for this car to accelerate from 18.0 m/s to 30.0 m/s what is the magnitude of the cars acceleration in m/s squared
27 s
with an average acceleration of -0.50 m/s squared, how long will it take a cyclist to bring a bicycle with a initial speed of 13.5 m/s to a complete stop
a=V/T
What is the expression for acceleration
1.3×10 cubed
Suppose a polar bear wants to swim from an ice floe to a particular point on shore where it knows that seals gather. The bear dives into the water and begins swimming with a speed of 2.60 m/s. By the time the bear arrives at the shore, its speed has decreased to 2.20 m/s. If the bear’s swim takes exactly 9.00 min and it has a constant deceleration, what is the distance traveled by the bear?
8.75 cm/s squared
a curious kitten pushes a ball of yarn at rest with its nose, displacing the ball of yarn 17.5 cm in 2.00 s. What is the acceleration of the ball of yarn?
93 m
a ball initialy at rest rolls down a hill with an acceleration of 3.3 m/s squared. If it accelerates for 7.5s how far will it move?
-7.5 m/s
a car starts from rest and tavels for 5.0s with a uniform acceleration of -1.5 m/s squared. What is the final velocity of the car?
10.0 m/s squared
a race car accelerates from 0 m/s to 30.0 m/s with a displacement of 45.0 m. What is the vehicles acceleration?
17 m/s
a toy car is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s squared. What is the final velocity after 6.0s?
the objects slows down
what velocity is positive and acceleration is negative. What happens to the objects motion
0.0 m/s
What is the speed of an object at rest?
Vavg= X/T
what is the expression for average velocity?
Change of X
in addition to displacement, which of the following must be used for a more complete description of the average velocity of an object
1.1 km
a dolphin swims 1.85 km/h. How far has the dolphin taveled after 0.60 h?
3.4 km to the south
a hiker travels south along a staight path for 1.5 h with an average velocity of 0.75 km/h then travels south for 2.5 h with an average velocity of 0.90 km/h. What is the hiker’s displacement for the total trip?
5.25 m/s
a soccer ball is kicked horzantly. What is its average speed if its displacement is 21.0 m after 4.00 s
111 m
a sports car accelerates at a constant rate from rest to a speed of 27.8 m/s in 8.00s. What is the displacement of the sports car in this time interval?
average velocity
the total displacement divided by the time interval during which the displacement occurred
displacement
the change in position of an object
instantaneous velocity
the velocity of an object at some instant
frame of reference
a coordinate system for specific the precise location of objects in space
the displacement is 0
distinguish between the displacement of a traveler who takes a train from New York to Boston and the displacement of a traveler who flies from boston to New York. Be sure to compare the magnitudes of the displacement
738.338
the sears tower in chicago is 443m tall. Joe wants to set the world’s stari climbing record and tuns all the way to the roof of the tower. If joe’s average upward speed is 0.60 m/s, how long will it take Joe to climb from street level to the roof of the Sears Tower
69.20 m/s
A falcon can fly 1.73 km downward in 25s. What is the average velocity of a peregrine falcon?
m/s squared
what units are used to measure free fall
-9.81m/s squared
what is the value for acceleration of object in free fall
free-fall acceleration
acceleration due to gravity is also called
at the top of its trajectory
the baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to mitt. At what point in the balls’s path does it experience zero velocity and nonzero acceleration at the same time
19.6 m
a rock is thrown straight upward with an initial velocity or 24.5 m/s where the downward acceleration due to gravity is 9.81 m/s squared. What is the rocks displacement after 1.00s
4.00 s
a rock is thrown straight upward with an initial velocity of 19.6 m/s where the downward acceleration due to gravity is 9.81 m/s squared. What time interval elapses between the rock’s being thrown and its return to the original launch point.
177 m
a baseball is released at rest from the top of the Washington Monument. It hits the grund after falling for 6.00s. What was the height from which the ball was dropped?
15 m/s
a coin is released at rest from the top of a tower hits the ground after falling 1.5s. What is the speed of the coin as it hits the ground
44 m
a rock is thrown from the top of a cliff with an initial speed of 12 m/s. If the rock hits the ground after 2.0s what is the height of the cliff
28.0 m/s
a tourist accidentally drops a camera from a 40.0 m high bridge. If g=-9.81 m/s squared and air resistance is disregarded, what is the speed of the camera as it hits the water
at least 19.6 cm
human reaction time is usually about 0.20s. If your lab partner holds a ruler between your finger and thumbs and releases it without warning, how far can you expect the ruler to fall before you catch it?
fall with equal acceleration with similar displacement
what there is no air resistance, objects of different masses
faster and faster
objects that are falling toward Earth move
they would hit the ground at the same time
which would hit the ground first if dropped from the same height in a vacuum, a feather or a metal bolt?
they would accelerate at the same rate
which would fall with greater acceleration in a vacuum, a leaf or a stone
projectile motion
what is the motion of object moving in two dimensions under the influence of gravity
a bullet being fired from a gun
what is an example if projectile motion
a hot air balloon toward earth
what is not an example of projectile motion
a parabola
what is the path of a projectile
a person diving into a pool from a diving board
what exhibits parabolic motion
a flat piece of paper released from a window
what does not exhibit parabolic motion
120 m
a stone is thrown at an angle of 30 degrees about the horizontal from the top edge of a cliff with an initial speed of 12 m/s. a stopwatch measures the stones the stones trajectory time from the top of the cliff to the bottom at 5.6s. What is the height of the cliff?
fame of reference
what is a coordinate system for specifying the precise location of objects in space
move west at a speed that is equal to the bus’s speed
a passenger on a bus moving east sees a man standing on a curb. From the passengers perspective, the man appears to be
straight down
a piece of chalk is dropped by a teacher walking at a speed of 1.5 m/s from the teachers perspective, the chalk appears to fall
208 s
a boat moves at 10.0 m/s relative to the water. If the boat is in a river where the current is 2.00 m/s, how long does it take the boat to make a complete round trip of 1000.0 m downstream?
7s; 143 m/s
a superhero flying at treetop level sees the Eiffel Tower elevator begin to free fall. If the superhero is 1.00 km away from the tower and the elevator falls from a height of 240.0 m, how long does the superhero have to save the people in the elevator? What should the superhero’s average velocity be?
25 km/h north
a small airplane flies at a velocity of 145 km/h toward the south as observed by a person on the ground. The airplane pilot measures an air velocity of 170.0 km/h south. What is the velocity of the wind that affects the plane
2.0s; 4.8 m
a baseball is thrown at an angle of 25 degrees relative to the ground at a speed of 23.0 m/s. If the ball was caught 42.0m from the thrower, how long was it in the air? How high was the tallest spot in the balls path
0 m/s
a passenger at the rear of a train traveling at 15m/s relative to earth throws a baseball with a speed of 15 m/s in the direction opposite the motion of the train. What is the velocity of the baseball relative to Earth as it leaves the throwers hand?
14.5 m/s
a spy runs from the front to the back of an aircraft carrier at a velocity of 3.5 m/s. If the aircraft carrier is moving forward at 18.0 m/s, how fast does the spy appear to be running when viewed by an observer on a nearby stationary submarine?
false
a hawk diving to catch a mouse is an example of projectile motion

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