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# Matter in Motion

### Motion, Force, Friction, Gravity

What is a reference point? An object that stays in place.
What is the SI unit for speed? m/s (meters per second)
Give the formula for speed speed = distance / time
Describe velocity in 3 words. speed with direction
What is a force? a push or a pull
What unit do scientists use to measure force? Newton
The combination of all the forces acting on an object. Net force
Forces in the same direction are: added
Forces in opposite directions are: subtracted
Is there any movement when the forces are balanced? no
Is there any movement when the forces are unbalanced? yes
A force that opposes motion between 2 surfaces friction
In 1 word, describe kinetic friction moving
In 2 words, describe static friction not moving
Who described the Law of Universal Gravitation? Sir Isaac Newton
What is mass a measure of? the amount of matter in an object
What is weight a measure of? the amount of gravitational force on an object
Is mass always the same no matter where you go in the universe? yes
Is weight always the same no matter where you go in the universe? no
Created by: SLindians
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