Newton's 3rd Law EX 1

The diagram shows all the action-reaction pairs:

Force	Action-reaction pair
Gravity	$F_G$ ${EP}_{}$ The gravitational force exerted by the Earth on the puck	$F_G$ ${PE}_{}$ the gravitational force exerted by the puck on the Earth
Normal force	$F_N$ ${IP}_{}$ The normal force exerted by the ice on the puck	$F_N$ ${PI}_{}$ The normal force exerted by the puck on the ice
Force of friction	$F_f$ ${IP}_{}$ The force of friction exerted by the ice on the puck	$F_f$ ${PI}_{}$ The force of friction exerted by the puck on the ice

The magnitude of $F_G$ ${EP}_{}$ is 3 N (0.3 kg x 10 N/kg) and the magnitude of $F_G$ ${PE}_{}$ is also 3 N.

The magnitude of $F_N$ ${PI}_{}$ is 3 N and the magnitude of $F_N$ ${IP}_{}$ is also 3 N.

The magnitude of $F_f$ ${PI}_{}$ is 0.06 N and the magnitude of $F_f$ ${IP}_{}$ is also 0.06 N.

Important note: Even though $F_G$ ${EP}_{}$ and $F_N$ ${IP}_{}$ are equal and opposite forces, they are not an action-reaction pair!