October 9, 2020
Forces and Motion
A force that occurs when an object rubs against another object
A(n) _______________is a push or pull and can make an object stop, speed up, slow down, or change
The force that works against motion is .
Something that makes an object start moving, stop moving, speed up, or slow down is a(n) .
Gravity and friction are examples of .
b. simple machines
The force that attracts a body toward the center of Earth, or toward any other physical body
What changes when the pull of gravity changes?
The motion of an object is affected by friction.
When you slide an object there is less friction than when you roll it.
An object in motion will continue to move in a straight line at a constant speed unless a force
acts on it.
If an object is at rest, it will remain at rest until a force (a push or a pull) is applied to it.
The tendency of an object to stay in motion or at rest until a force acts upon it is .
a. frame of reference
An object in motion will stay in motion unless what happens?
a. it will always stop
b. it becomes frozen
c. a force acts on it
What describes the speed and direction of an object's motion?
For every action there is an equal and opposite reaction is which of Newton's Laws of Motion?
Gravity does all of the following EXCEPT what?
a. Brings a ball back to Earth.
b. Pulls spilled liquid to the ground.
c. Keeps you from sliding on the grass.
d. Keeps Earth from flying off into space.
Newton’s law of motion that describes action-reaction pairs is the
a. first law.
b. second law.
c. third law.
d. law of gravity.
What is the tendency of an object to resist change in motion?
The motion of an object is not always affected by gravity.
Rollers can help reduce friction.