Explain... 5. When you increase the mass of an object (while keeping the applied force the same) what happens to the rate of acceleration? Explain why this occurs using your understanding of Inertia (an object’s resistance to a change in motion). 6. When you apply a constant force to an object does the object move at a constant velocity or does its velocity increase? Explain why this occurs using your understanding of acceleration/force (gravity). 7. When you increase the applied force, what happens to the acceleration of the object? 8. As the mass increases, what happens to the amount of force needed to begin moving the object? Explain. 9. Do you need to continue applying force on an object to keep it moving? Explain why.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”