For each of the following interactions, identify action and reaction forces (action-reaction pairs):
a. A hammer hits a nail
b. Earth’s gravity pulls down on you
c. A helicopter blade pushes air downward
d. You step off a curb
e. You pat your friend on the back
f. A wave hits a rocky shore
Answers
a)hammer force on the nail - force applied by nail on the hammer.
b)force applied by the gravity - force applied by your body.
c) the force applied by the helicopter blades on the air and in return air exert force on the blade.
e) force applied by your ✋ on the friends back - in return friends body exert force on you.
f) force exerted by the wave - return force by the rock
- According to Newton's third law, when two bodies interact, they exert forces on each other that are equal in magnitude and opposite in direction.
Action-Reaction pair of the following interaction are as follows-
a. A hammer hits a nail
ACTION- Hammer exerting force on the nail in the downward direction.
REACTION - The Nail exerts equal and opposite force on the hammer.
b. Earth’s gravity pulls down on you
ACTION- Earth attracts you towards itself by exerting gravitational force.
REACTION- You pull up the earth towards yourself.
c. A helicopter blade pushes air downward.
ACTION - Blade exerts a force on the Air around the helicopter to push it in a downward direction.
REACTION - Air around the blades of the helicopter pushed the blades in an upward direction.
d. You step off a curb
ACTION - You exert a force on the ground to push it backward.
REACTION - Ground exerts a force of equal magnitude on you in the forwarding direction.
e. You pat your friend on the back.
ACTION - Force exerted by the hand on the back of your friend in the downward direction.
REACTION - Surface of the back exerting force of the same magnitude on the hand but in the upward direction.
F. A wave hits a rocky shore
ACTION - The wave exerts force in forward direction on the rocks.
REACTION- Rocks exert an equal amount of force on the wave in the backward direction.
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