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Section 2-3 Connecting Motion with Forces

Section 2-3 Connecting Motion with Forces. What is a force?. Force- a push or pull one body exerts on another. Force changes the motion or shape of an object. Unbalanced force – when the forces on an object are unequal. Ex. Man pushing car. Result = motion.

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Section 2-3 Connecting Motion with Forces

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  1. Section 2-3 Connecting Motion with Forces

  2. What is a force? • Force- a push or pull one body exerts on another

  3. Force changes the motion or shape of an object

  4. Unbalanced force – when the forces on an object are unequal Ex. Man pushing car Result = motion

  5. Balanced Force – forces on an object that are equal in size and opposite in direction

  6. Balanced forces Chair pushing up Gravity pulling down Example: sitting down Result – forces are equal, no motion

  7. Friction – the force that opposes motion between two surfaces that are touching each other.

  8. What factors affect friction • Type of Surface • How hard the surfaces are pushed together

  9. Friction increases when: • Surfaces are pushed harder against each other

  10. Friction acts: • In a direction opposite to the direction of the objects motion • Without friction: a moving object will not stop until it strikes another object.

  11. Pair share: • Would you encounter a weaker frictional force walking on a dirt trail or crossing a wet log bridge? • Crossing a wet bridge more slippery • Would you have a greater frictional force to overcome pushing a box of full water bottles across a floor or pushing a box of empty water bottles across the same floor? Explain • Pushing full bottles full bottles harder to push against the surface of the floor

  12. It is hardest to push over the surface with the most friction

  13. Dodge Viper Burnout

  14. Life without Friction

  15. Types of friction • Show pg 38-39 pearson text book • Sliding • Static • Rolling • Fluid

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