Students place the end of a wooden board on some books so that the board can be used as an inclined plane. The students release a ball at the top of the inclined plane and measure the time for the ball to reach the bottom of the ramp. The students perform three trials. The students then cover the board with a cloth and follow the same procedure as before. The data are graphed below.   Part A Describe two forces acting on the ball during the investigation. Part B Explain why the ball takes more time to roll down the ramp with a cloth surface. Part C Explain why the students repeated the investigation three times. Part D Explain how the ball's energy changes as the ball moves down the ramp.

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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?”