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12 March, 15:38

Jack and Annie push a cart to the left with forces of 3 N and 4 N, respectively. If the cart is stationary, what is the force of friction?

A. 1 N to the left

B. 3 N to the right

C. 7 N to the right

D. 7 N in the positive direction

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  1. 12 March, 15:57
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    Jack and Annie, working together, are pushing the cart to the left with 7 Newtons of force. Since it's not moving, there must be 7 Newtons of force directed to the right coming from somewhere. That's the friction. (Choice-C.)

    If the forces on the cart didn't add up to zero, then the cart would be accelerating.
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