# physics multiple choice

c
a) optics
b) thermodynamics
c)vibrations and wave phenomena
d) relativity
b
A baker makes a loaf of bread. Identify the area of physics that this involves.
a) optics
b) thermodynamics
c) mechanics
d) relativity
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b
According to the scientific method, why does a physicist make observations and collect data?
a)to decide which parts of a problem are important
c) to make an interpretation
d) to solve all problems
c
According to the scientific method, how does a physicist formulate and objectively test hypotheses?
a) by defending an option
b) by interpreting graphs
c) by experiments
d) by stating conclusions
a
In the steps of the scientific method, what is the next step after formulating and objectively testing hypotheses?
a) interpreting results
b) stating conclusions
c) conduting experiments
d) making observations and collecting data
c
Diagrams are not designed to
a) show relationships between concepts
b) show setups of experiments
c) measure an event or situation
d) label parts of a model
b
The symbol mm represents a
a) micrometer
b) millimeter
c) megameter
d) manometer
c
If the change in position ∆x is related to velocity v (with units of m/s) in the equation ∆x=Av, the constant A has which dimension?
a) m/s²
b) m
c) s
d) m²
d
If a is acceleration (m/s²), ∆v is change in position (m), and ∆t is the time interval (s), which equation is not dimensionally correct? (hint: plug in the units to see what cancels out)
a) ∆t=∆x/∆v
b) a= v²/∆x
c) ∆v=a∆t
d) ∆t² = 2 ∆x a
c
Which of the following could NOT be a scientific hypothesis?
a) Sunscreen will cause cancer
b) Adding alcohol to gasoline will improve gas mileage
c) There is life outside our solar system
d)Eating foods high in cholesterol will cause heart problems
B
Physics and Chemistry are examples of
a)Life sciences
b)Physical sciences
c)Social science
c
Which of the following is a fundamental unit of measurement?
a) Speed
b) Velocity
c) Displacement
d) Acceleration
c
A shopping cart is given an initial velocity of 2.0m/s and experiences a constant acceleration of 3.0 m/s². What is the magnitude of the carts displacement after the first 4.0s of its motion?
a) 10.0m
b) 55m
c) 32m
d) 80.0m
a
Acceleration in Physics is ________
a) The rate at which velocity changes
b) The rate at whic distance changes
c) Always zero
d) Always constant
b
If your car is traveling at a steady speed of 30 mil/hr. Which of the following is true?
a) Your distance from the starting point is constant
d) Both a and b
e) Both b and c
b
If a ball is thrown straight up, the velocity at maximum height will be
a) 9.81 m/s²
b) zero
c) Neither of the above, it depends on how fast you threw it
d
Which of the following situations represents a negative displacement? (Assume positive position is measured vertically upward along a y-axis)
a) A cat stands on a tree limb
b) A cat jumps from the ground onto a tree limb
c) A cat jumps from a lower tree limb to a higher one
d) A cat jumps from a tree limb to the ground
b
A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the miss. At what point in the ball’s path does it experience zero velocity and nonzero velocity at the same time?
a) midway on the top
b) at the top of its path
c) the instant it leaves the catcher’s hand
d) the instant before it arrives in the catcher’s mitt
b
Which of the following is a physical quantity that has a magnitude but no direction?
a) vector
b) scalar
c) resultant
d) frame of reference
a
Which of the following is an example of a vector quantity?
a) velocity
b) temperature
c) volume
d) mass
b
Identify the following quantities as scalar or vector: the mass of an object, the number of leaves on a tree, wind velocity.
a) vector, scalar, scalar
b) scalar, scalar, vector
c) scalar, vector, scalar
d) vector, scalar, vector
c
For the winter, a duck flies 10.0 m/s due south against a gust of wind with a speed of 2.5 m/s. What is the resultant velocity of the duck?
a) 12.5 m/s south
b) -12.5 m/s south
c) 7.5 m/s south
d)-7.5 m’s south
a
Multiplying or dividing vectors by scalars results in
a) vectors
b) scalars
c) vectors if multiplied or scalars if divided
d) scalars if multiplied or vectors if divided
a
In a coordinate system, a vector is oriented at angle θ with respect to the x-axis. The x component of the vector ‘s magnitude multiplied by which trigonometric function?
a) cos θ
b) cot θ
c) sin θ
d) tan θ
d
Which of the following is the motion of objects in two dimensions under the influence of gravity?
a) horizontal velocity
b) directrix
c) vertical velocity
d) projectile motion
b
Which of the following is an example of projectile motion?
a) a jet lifting off a runway
b) a thrown baseball
c) an aluminum can dropped straight into the recycling bin
d) a space shuttle being launched
c
Which of the following is not an example of projectile motion
a) a volleyball served over a net
b) a baseball hit by a bat
c) a hot-air balloon drifting toward Earth
d) a long-jumper in action
b
What is a path of a projectile (in the absence of friction)?
a) a wavy line
b) a parabola
c) a hyperbola
d) Projectiles do not follow a predictable path
c
Which of the following would hit the group first if dropped from the same height in a vacuum, a feather or a tennis ball?
a) the feather
b) the tennis ball
c) they would hit the ground at the same time
d) they would be suspended because there is no gravity
b
A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball’s path does the ball experience zero velocity?
a) Midway on the way up
b) At the top of its trajectory
c) The instant it leaves the catcher’s mitt
d) The instant before it arrives at the catcherls mitt
a
When an object id launched with some initial horizontal velocity the rate at which it falls is considered to be
a) acceleration
b) constant
c) decelerated
d) zero
b
What does it tell you about the motion of the projectile if the vertical velocity is positive?
a) that the object is moving down
b) that the object is moving up
c) that the object is slowing down
d) that the object is speeding down
c
Which of the following is the cause of an acceleration?
a) speed
b) inertia
c) force
d) velocity
b
Which of the following statements does not describe force?
a) force causes objects at rest to remain stationary
b) force causes objects to start moving
c) force causes objects to stop moving
d) force causes objects to change direction
c
Which of the following forces arises from direct physical contact between two objects?
a) gravitational force
b) fundamental force
c) contact force
d) field force
c
A newton is equivalent to which of the following quantities?
a) kg
b) kgm/s
c) kgm/s²
d) kg(m/s)²
c
The length of a force vector represents the
a) cause of the force
b) direction of the force
c) magnitude of the force
d) type of force
c
A free-body diagram represents all of the following except
a) the object
b) forces as vectors
c) forces exerted by the object
d) forces exerted on the object
d
The free-body diagram shown above represents a car being pulled by a towing cable. In the diagram, the 5800 N force is
a) the gravitational force acting on the car
b) the backward force the road exerts on the car
c) the upward force the road exerts on the car
d) the force exerted by the towing cable on the car
b
A late traveler rushes to catch a plane, pulling a suitcase with a force directed 30.0⁰above the horizontal. If the horizontal component of the force on the suitcase is 60.6 N, what is the force exerted on the handle?
a) 53.0 N
b) 70.0 N
c) 65.2 N
d) 95.6 N
d
A car goes forward along a level road at a constant velocity. The additional force needed to bring the car into equilibrium is
a) greater than the normal force times the coefficient of static friction
b) equal to the normal force times the coefficient of static friction
c) the normal force times the coefficient of kinetic friction
d) zero
c
If a nonzero net force is acting on an object, then the object is definitely
a) at rest
b) moving with a constant velocity
c) being accelerated
d) losing mass
a
Which statement about the acceleration of an object is correct?
a) The acceleration of an object is directly proportional to the net external force acting on the object and inversly proportional to the mass of the object
b) the acceleration of an object is directly proportional to the net external force acting on the object and directly proportional to the mass of the object
c) the acceleration of an object is inversely proportional to the mass of the object
d) the acceleration of the object is inversely proportional to the net external force acting on the object
b
According to Newton’s second law, when the same force is applied to two objects of different masses,
a) the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration
b) the object with greater mass will experience a smaller acceleration, and the object with less mass will ecperience a greater acceleration
c) the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration
d) the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration
a
an airplane with a mass of 1.20 x 10⁴kg tows a glider with a mass of 0.60 x 10⁴kg. If the airplane propellers provide a net forward thrust of 3.60 x 10⁴N, what is the acceleration of the glider? (Disregard friction)
a) 2.00 m/s²
b) 3.00 m/s²
c) 6.00 m/s²
d) 9.80 m/s²
d
a sled traveling at a speed of 3.0 m/s slows to a stop 4.0m from the point where its passenger rolled off. What is the magnitude of the horizontal net force that slows the 110 N sled? (Assume a₉=9.81 m/s².)
a) 130 N
b) 34 N
c) 37 N
d) 13 N
c
The statement by Newton that for every action there is an equal and opposite reaction is which of his laws of motion?
a) first
b) second
c) third
d) fourth
d
Which are simultaneous equal but opposite forces resulting from the interaction of two objects?
a) net external forces
b) field forces
c) gravitational forces
d) two objects and two forces
d
Newton’s third law of motion involves the interaction of
a)one object and one force
b) one object and two forces
c) two objects and one force
d) two objects and two forces
b
The magnitude of the gravitational force acting on an object is
a) frictional force
b) weight
c) inertia
d) mass
d
A measure of the quanitity of matter is
a) density
b) weight
c) force
d) mass
c
A change in the gravitational force acting on the an object will affect the object’s
a) mass
b) coefficient of static friction
c) weight
d) inertia
a
A sled weighing 1.0 x 10² N is held in place on a frictionless 20.0⁰ slope by a rope attached to a stake at the top. The rope is parallel to the slope. What is the normal force of the slope acting on the sled?
a) 94 N
b) 47 N
c) 37 N
d) 34 N
a
A book with a mass of 2.0 kg is held in equilibrium on a board with a slope of 60.0⁰ by a horizontal force. What is the normal force exterted on the book?
a) 39 N
b) 61 N
c) 15 N
d) 34 N
d
What are the units of the coefficient of friction?
a) N
b) 1/N
c) N²
d) The coefficient of friction has no units

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