AP Physics 1· difficulty 2/5
A book rests on a table. Which pair are Newton's 3rd-law pairs?
Earth pulling book down; air pushing book up.
Earth pulling book down; table pushing book up.
Book's weight; book's mass.
Book pushing table down; table pushing book up.
Explanation
A 3rd-law pair acts between the same two objects in opposite directions: book↔table contact forces are the pair.
Want 10 more like this — adaptive to your weak spots?
A boy pushes a shopping cart forward with 50\text{N}. By Newton's third law, the cart exerts a force on the boy of…
chevron_rightA rocket accelerates by ejecting hot gases. The reaction force on the rocket is exerted by…
chevron_rightA horse pulls on a cart. By Newton's 3rd law, the cart pulls back on the horse with <strongequal</strong force. Yet the system can accelerate. Why?…
chevron_right