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Force & Motion
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- 2. Speed & VelocitySpeed - the rate of change in position over time (distance/time) Instantaneous speed Average speed How is velocity different from speed? Velocity describes both speed and direction
- 3. Change in VelocityWhat makes an object change velocity?
- 4. Force Push orPull Forces can cause a change in velocity Examples: Gravity Magnetism Friction
- 5. Balanced Forces Forcesthat act on the same object are opposite in direction are equal in size
- 6. Balanced Forces Bookon table Weight of the book is downward force caused by gravity Table pushes back with an equal and opposite force Net force is zero
- 7. Unbalanced Forces Forcesthat are NOT opposite and equal What do they cause? CHANGE IN VELOCITY ACCELERATION
- 8. Friction Force thatopposes motion between 2 surfaces Depends on the: types of surfaces force between the surfaces
- 9. Types of FrictionStatic Friction: (Couch Potato) Force between objects at rest Sliding Friction: (Ice skating) Solid surfaces slide over each other Rolling Friction: (Rollerblading) An object rolls over a surface . Fluid friction: (Submarine) An object moves through a fluid
- 10. Friction Friction isgreater... between rough surfaces when there’s greater force between surfaces (such as more weight)
- 11. Lubricant Changes slidingfriction into fluid friction
- 12. Friction Is frictionalways bad?
- 13. Gravity The attractiveforce between all objects in the universe
- 14. Acceleration of GravityNear the surface of the earth the acceleration due to gravity is 9.8 m/s/s
- 15. Newton’s 1 st Law An object at rest remains at rest and an object in motion will continue moving at a constant velocity unless acted on by unbalanced forces.
- 16. Newton’s Laws ofMotion
- 17. Newton’s 1 st Law INERTIA tendency of an object to resist any change in its motion increases as mass increases
- 18. Newton‘s 2 nd Law If more force is applied, an object will be accelerated _____ more
- 19. Newton’s 2 nd Law More force means more acceleration More mass means less acceleration Force = mass X acceleration F = ma
- 20. Newton’s 3 rd Law For every action, there is an equal and opposite reaction. Forces occur only in pairs Act on different objects Equal and opposite
- 21. Newton’s 3 rd Law The hammer exerts a force on the nail to the right. The nail exerts an equal but opposite force on the hammer to the left.
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- 23. Terminal Velocity Thefinal speed of a falling object.
- 24. Terminal Velocity Airresistance is offsetting the the weight of the object
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- 27. Force Aristotle's idea:For an object to move at a constant speed, a constant force must be applied.
- 28. Force Newton’s idea:An object moving at a constant speed will continue at that speed without additional force being applied.
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