ANANDU S APhysical ScienceReg.No. 182 14 340 003

Newton’s 3rd Law• For every action there is an equal and

opposite reaction.

Book toearth

Table tobook

Example 1

A horse harnessed to a cart exerts an equal and opposite force to the cart as it exerts a force against the ground.

Example 2

Space shuttle’s rocket boosters propel the orbiter into space by exerting an equal and opposite force to exhaust gasses.

Action: earth pulls on you

Reaction: you pull on earth

Action and Reaction on Different Masses

Consider you and the earth

Action: tire pushes on roadReaction: road pushes on tire

Action: rocket pushes on gases

Reaction: gases push on rocket

Concept Question 1

Why are we able to

walk?

Answer

We walk forward because when one foot pushes backward against the ground, the ground pushes forward on that foot.

Concept Question 2

What makes a car go forward?

Answer By Newton’s third

law, the ground pushes on the tires in the opposite direction, accelerating the car forward.

ReviewNewton’s Third Law:

For every action there is an equal and opposite reaction.

THANKYOU