You have a box of mass 50 kg on a frictionless incline that makes an angle of 25 degrees with the ground. You don’t want it to slide down the incline, so you push on the box. You push on the box in a direction that is parallel to the ground (so … NOT parallel to the incline!). What is the minimum force required to prevent it from sliding down the incline? NOTE: you WILL want to draw a picture to keep track of the geometry Extra Credit: What is the magnitude of the normal force while pushing on the box?

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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?”