Download Speed= Distance/ Time

Test Review for Physics 1 – ANSWER KEY
1.
Speed is the distance an object moves in a period of time, indicating how fast the object is
moving.
Speed= Distance/ Time
2.
Acceleration is when an object speeds up, slows down and/ or changes direction.
Acceleration= Velocity (final) – Velocity (initial)/ time
3.
Velocity is how fast an object travels in a particular direction. Velocity is a factor of speed and
DIRECTION.
Velocity= Distance/ Time
4.
Something is in motion when its distance from another object is changing.
5.
Reference points are used to show that an object is moving.
6. Speed is how fast something is going. Velocity is how fast it is going, AND in what direction.
7. Force is a push or pull
8. No, all forces do not cause an object to change its speed or direction. Balanced forces are do
not cause the object to move or change its direction.
9. All forces have a direction and magnitude
10. Force is measured with a spring scale
11. Force is measured in Newton’s (N)
12. Balanced forces have a net force of 0N. The reason for that is that all forces acting upon the
object are equal.
13. Unbalanced forces are forces that are unequal and cause movement of the object in the
direction of the greater force.
14. Newton’s 1st law is the law of Inertia. Objects at rest tend to stay a rest, and an object in motion
will stay in motion until a force great enough is acted upon it.
15. Newton’s 2nd law is Force=Mass x Acceleration. The amount of acceleration depends on the
mass of the object and the force that is applied.
16. Newton’s 3rd law – For every action, there is an opposite and equal reaction. Basically it means
that if you push on something, it pushes back on your with equal force.
17. The less massive object demonstrates greater acceleration than the more massive object.
18. The greater the force exerted, the greater the acceleration. (Large Force = Large Acceleration)
19. Unbalanced forces cause objects to accelerate.
20. The motorcycle has less mass and will accelerate faster than the car.
21. Yes, inertia exists when an object is stationary. The object at rest will resist the change in
motion until a sufficient force is applied to make it move.
22. Yes, inertia exists when an object is in motion. It will remain in motion until a sufficient
resistance force is applied to make it slow down or stop.
23. You can tell that an object has stopped when the distance remains the same as the time
increases.
24. Objects with more mass have more inertia.
25. Describe the motion of each line:
a. Line with inside curve facing down: accelerating and then slowing down
b. Line diagonal from left bottom and going up the right: constant speed
c. Line is horizontal: stationary/stopped
d. Line diagonal from top left and going down to the right: returning to “zero point”
e. Line with the inside curve facing up: object is accelerating