Question

Anna needs to move a box of paperback books across the room. If she applies a force of 20 newtons to the box, what is the magnitude of the force exerted by the box on Anna?

Answer 1

According to Newton's third law, any object exerting force against anything will receive the same amount of force that the object is exerting.

Answer 2

Since she applies 20 N of force to the object, the same amount of force, 20 N is being exerted to Anna.

Answer 3

yes
it must be 20N

Answer 4

We have Newton to thank for. So when the apple hit Newton's head newton's head exerted the same force to that apple.

Answer 5

Take this example. On a frictionless surface a boy and a girl are on two different skateboard. When either pushes the other both will move for equal distance from the reference point.

Answer 6

Or let's say there are two people on ice horseplaying and one kicks the other with one food then both guys will move for equal distance assuming no irregularities on ice

Answer 7

20