A student pushes a television cart to the left with a constant force of 100 N. The force of friction between the cart and the floor pushes back to the right with a force of 75 N. If the cart was initially at rest, how will it move as the constant force is applied?

Explanation:

As you can see in the badly drawn picture below, the force pushing to the left  is 100N while the opposing force pushing the right is 75N. These forces are subtracted from one another, which would leave us with a total force of 25N (100N - 75N = 25N) pushing to the left. Since the cart is initially at rest, this means that there is no additional force being applied left or right of the cart. Therefore, with the 25N of force, the cart would move at a constant speed to the left.

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