Motion
What quantity describes how fast an object moves and in what direction?
Velocity
What is a force?
A push or a pull
What type of energy does a moving object have?
Kinetic energy
What two quantities affect momentum?
Mass and velocity
What does impulse change?
Momentum
An object moves 20 m in 5 s; what is its speed?
4 m/s
Which law explains why a seatbelt is needed when a car stops suddenly?
Newton’s First Law
What type of energy depends on height?
Potential energy
What is the formula for momentum?
p = mv
What two factors affect impulse?
Force and time
If an object changes direction but not speed, is its velocity changing?
Yes
Which Newton’s Law explains action-reaction force pairs?
Newton’s Third Law
What is the formula for work?
F X D
Which has more momentum: a fast tennis ball or a slow bowling ball?
Bowling ball
Why do airbags increase stopping time?
Reduce force
What does the slope of a distance-time graph represent?
Speed
If two objects push on each other, how do the forces compare in size?
Equal
Is work done if force is applied but the object does not move?
No
If velocity increases, what happens to momentum?
Increases
In which collision do objects stick together?
Inelastic collision
An object’s velocity changes from 10 m/s to 0 m/s; what happened to its motion?
It stopped
If no net force acts on an object, how will it move?
Constant velocity
Two students lift the same box, but one lifts faster; who has more power?
The faster student
Two objects have equal momentum; which must have greater speed?
Smaller mass
Impulse equals force times time, but is also equal to what?
Momentum change