Question

According to Newton's third law, for every force there is always a reaction force of equal magnitude and opposite direction. In each of the examples below, identify an action-reaction pair of forces.

(a) A tennis racket hits a tennis ball, exerting a force

on the ball. (Select all that apply.)

the force exerted by the tennis ball on the racket

the force felt in the player's arm at time of contact

the force the tennis racket exerts on the tennis ball

the force the tennis court exerts on the player's feet

(b) Two ice skaters are initially at rest and in contact. One of the skaters then pushes on the other skater's back, exerting a force on that skater. (Select all that

apply.)

the force the first skater exerts on the back of the other

the force the other skater exerts on the first skater's hands

the force the ice rink exerts on the first skater

the force the ice rink exerts on the other skater

(c) A car is moving at high speed and runs into a tree, exerting a force on the tree. (Select all that apply.)

the force the car exerts on the tree

the force the road exerts on the tires

the force the tires exert on the road

the force the tree exerts on the car

(d) Two cars are moving in opposite directions and collide head-on. (Select all that apply.)

the force the second car exerts on the first car

the force the road exerts on the tires of the second car

the force the road exerts on the tires of the first car

the force exerted by the first car on the second car

(e) A person leans on a wall, exerting a force on the wall. (Select all that apply.)

the force the person exerts on the wall

the force the feet of the person exerts on the floor

the force the floor exerts on the feet of the person

the force the wall exerts back on the person

(f) A hammer hits a nail, exerting a force on the nail. (Select all that apply.)

the force the nail exerts on the hammer

the force the hammer exerts on the nail

the force the hammer exerts on the man

the force the man exerts on the hammer

(g) A mass hangs by a string tied to a ceiling, with the string exerting a force on the mass. (Select all that apply.)

the force the Earth exerts on the mass

the force the mass exerts on the string

the force the Earth exerts on the string

the force the string exerts on the mass

(h) A bird sits on a telephone pole, exerting a force on

the pole. (Select all that apply.)

the force the bird exerts on the telephone pole

the force the Earth exerts on the the bird

the force the telephone pole exerts on the bird

the force the Earth exerts on the telephone pole

Answer 1

Action reaction pair normally exerts in between the objects in which force is involved.

a) The action force is force acting on the ball by racket. So in turn reaction force is the force exerted by the tennis ball on racket.

b) The action force is the force the first skater exerts on the back of the other. The reaction force is the force the other skater exerts on the first skater's hands.

C) The action force is the force car exerts on the tree and the reaction force is the force that tree exerts on the car.

d) The action force is the force exerted by the first car on the second. And the reaction force is the force exerted by the second car on the first car.

e) The action force is the force exerted by the person on the wall and reaction force is the force exerted by the wall on the back of the person.

f) The action force is the force exerts by the hammer on the nail and reaction force is the force exerts by the nail on the hammer.

g) The action is the force the string exerts on the mass and reaction force is the force the mass exerts on the string.

h) The action is the force the bird exerts on the telephone pole. The reaction is the force the pole exerts on the bird.