# Physical Science Final Exam #2

The front seat of the car
A passenger in the rear seat of a car moving at a steady speed us at rest relative to?
A person walks 1 mile every day for exercise, leaving her front porch at 9:00 am. and returning to her front porch at 9:25 am. What is the total displacement of her daily walk?
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By driving west 6 blocks from the starting point
A person drives north 6 blocks, then turns west, and drives 6 blocks. The driver then turns south and drives 6 blocks. How could the driver have made the distance shorter while maintaining the same displacement?
4 meters
A ball is rolled uphill a distance of 5 meters before it slows, stops and begins to roll back. The ball rolls downhill 9 meters before coming to rest against a tree. What is the magnitude of the ball’s displacement?
2 km south
Displacement vectors of 4 km south, 2 km north, 5 km south, and 5 km north combine to a total displacement of?
the amount of the time needed to travel the distance
Speed is the ratio of the distance an object moves to
at a particular instant
Instantaneous speed is measured
speed
The slope of a line on a distance-time graph is
at rest
A horizontal line on a distance-time graph means the object is
more than one direction, velocity, and one speed
vector addition is used when motion involves
acceleration
The rate at which velocity changes is called
a ball moving at a constant speed around a circular track
What identifies a change in motion that produces acceleration?
constant acceleration
Objects in free fall near the surface of the Earth experience
traveling around a circular track
What’s an example the describes constant acceleration due ONLY to a change in direction?
acceleration
The slope of a speed-time graph indicates
Slowing down, changing direction, and gaining speed.
An object that is accelerating may be
How fast a velocity is changing at a specific instant
What is instantaneous acceleration?
Frame of references
The motion of an object looks different to observes in different…?
meter
The SI unit for measuring length is the?
Displacement
The direction and length of a straight line from the starting point to the ending point of an object’s motion is?
vectors
Displacement and velocity are examples of what? because they have both magnitude and direction.
resultant vectors
The sum of two or more vectors is called the?
m/s
speed is measured in units of?
instantaneous speed
A car’s speedometer measures
speed
v = d/t is the equation for?
direction
The difference between speed and velocity indicates the _____ of motion and speed does not
two or more velocities add by
accelerate
a moving object does not ______ if its velocity remains constant.
gravity
Freely falling objects accelerate at 9.8 m/s2 because the force of _________ acts on them.
acceleration
The velocity of an object moving in a straight line changes at a constant rate when the object is experiencing constant _____
speed
The acceleration of a moving object is calculated by dividing the change in _____ by the time over which the change occurs.
curved
Accelerated motion is represented by a _____ line o a distance-time graph.
positive
A car that increases its speed for 20 km/h to 100 km/h undergoes _____ acceleration.
Instantaneous acceleration
______ ______ is how fast a velocity is changing at a specific instant.
Is the amount of matter in an object, a measure of the inertia of an object, which depends on the amount of matter the object contains
Mass:
is the force of gravity acting o an object.
Weight:
An object that is in motion stays in motion and an object at rest stays at rest as long as the net forces acting on that object are zero
Inertia:
The law of Inertia
Newton’s 1st Law states:
Newtons (N)
SI unit for force
w=m.g
Weight formula:
kg x m/s(2)
1 N:
m/s(2)
N/kg
Push or pull on an object
Force
Magnitude and direction
Vector
Velocity, Acceleration, Force, and Gravity
List 4 things that are vectors
Newton
Force (SI unit):
m/s(2)
Acceleration (SI unit):
1 m/s(2)
Velocity (SI unit):
km x 1 m/s(2)
Formula for Newton:
forces combined when they are acting on an object (they can be pushed or pulled)
What is a net force?
balanced force
What do we call it when net forces are zero acting on an object (so there is no change in the object’s motion)?
True
True/False: All moving objects are subject to friction.
acceleration= net force / mass or a=f/m
Formula for Newton’s 2nd Law of Motion
mass x velocity
Formula for Momentum
kg x m/s
SI Unit for Momentum
For every action there is an equal and opposite reaction.
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.
Newton’s Third Law of Motion
True
(True or False) Force always exist in pairs.
True
(True or False) Only when equal and opposite forces act on the same object do they result in a net force of zero.
True
(True or False) Momentum is a vector
If no net force acts on a system, then the total momentum does not change.
Law of Conservation
Momentum
What is conserved when 2 objects collide in a closed system?

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