1. 8th Grade Physics Changing Motion Unit

2. Force
A push or a pull.
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3. Balanced Force
30N
30N
The net force on an object is zero and the object’s motion does not change.
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4. Unbalanced Force
50N
20N
The net force of an object does not equal zero which results in a change in the motion of the object.
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5. The sum of all the forces acting on an object.
Net Force
The sum of all the forces acting on an object.
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6. Magnitude The strength of an object or event.
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7. Speed The distance traveled by an object in a given amount of time.
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8. Velocity
Speed + Direction

9. Acceleration You can FEEL acceleration.
The rate at which an object’s speed and/or directions changes over time.
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10. Friction
The force between objects that affects how easily they move past each other.
Image: Definition: Access Science glossary, page 315.

11. Gravity A force that pulls objects together.
Gravity caused the apple to fall on Sir Isaac Newton’s head.
Image from: Definition adapted from: Access Science glossary, page 316.

12. Calculate To figure out by computation.
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13. Inertia The tendency of an object to resist a change in motion.
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14. Mass The total amount of matter in something.
Image: Definition: Access Science, glossary page 317.

15. Newton A measurement of force. 15N 
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16. Newton’s First Law
The bowl will stay on the table until an unbalanced force acts on it.
An object will stay in motion or an object will stay at rest unless acted upon by an unbalanced force.
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17. Newton’s Second Law
The smaller the object, the greater its acceleration, and the more force applied to an object, the greater its acceleration.
Image: Definition adapted from: ScienceSaurus page 284.

18. Newton’s Third Law
For every action, there is an equal but opposite reaction.
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19. Potential Energy Energy at rest or stored energy.
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20. Kinetic Energy Energy in motion.
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