A 140-lb restaurant manager received a shipment of frozen meat in a 1600 N crate. She pushes it across the floor applying a 90 N force with her hands.
A) She will feel it pushing back at her with less than 90 N, if the crate is moving forward.
B) She will feel a 1600 N force from the crate pushing back at her.
C) The crate will push back at her with a force of 140 lb.
D) She always feels a 90 N force from the crate pushing back against her hands.
E) Only if the crate does not move will she feel a force of 90 N.
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What scientific concept do you need to know in order to solve this problem?
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