forces. force any push or pull example: opening a door pushing something across the floor
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FORCES
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Forceany push or pull Example: opening a door
Pushing something across the floor
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Balanced Forces
• Do not cause a change in motion. They are equal in size and opposite in direction. The forces cancel each other out
• Example: When arm wrestling neither arms are moving
• Pushing/Leaning against a person and neither moving
•
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Unbalanced ForcesAlways cause a change in motion. They are not equal and opposite.
Example: When arm wrestling, one person is stronger and their hand goes down (one person wins)
Pushing against a person and one person moves/falls
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FrictionThe force that one surface exerts on another when the two rub against each other
Example: When you roll a ball across the floor, it loses energy as it rolls due to friction
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InertiaAn object at rest stays at rest, and an object in motion will stay in motion unless acted on by a force
Example: the ball would continue rolling across the floor if there was no friction (until it hit something that makes it stop)