Motion and Forces Section 2-3.

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Presentation transcript:

Motion and Forces Section 2-3

What is a force? a door a rubber band Shove a book across the table Some are obvious (car hits tree), others are not (floor pushing on feet).

Effects of Forces on Objects Does the object move when a force is exerted on it? Balanced forces: Unbalanced Forces:

Inertia and Mass Inertia: Compare the inertia of bowling ball with tennis ball More mass =

Newton’s first law An object remains in motion unless a net force acts on it. An object at rest unless a net force acts on it. (INERTIA) Wheelbarrow with rake on top strikes a rock. What happens? Why do cars have seatbelts?

Friction Force that that are touching. Amount of friction depends on: The , and the force pressing the surfaces together.