Chapter 12. Forces and Motion. Force. Force is a push or a pull. Force. A force can cause: A resting object to move Accelerate a moving object By changing the object's Speed Direction. Measuring Force. Measuring Force. lbs - Pound. N - Newton. Earth.

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Chapter 12

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Newton’s First Law The Law of Inertia An object in moving tends to stay in motion at a constant velocity and an object at rest tends to remain at rest unless a net force acts on it.

Example #1 A car with a mass of 2000kg is parked on the side of the road. How much force is needed to accelerate the car at 3m/s²? (Assume that there is no friction against the car.)