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Every action has an equal and opposite reaction.

Every action has an equal and opposite reaction

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Page 1: Every action has an equal and opposite reaction

Every action has an equal and

opposite reaction.

Page 2: Every action has an equal and opposite reaction

Action and Reaction Pairs

Feet impact boardBoard impacts feet

Bedouin pulls sheepSheep pulls bedouin

Fist hits neckNeck hits fist

Wheels push roadRoad pushes wheels

Page 3: Every action has an equal and opposite reaction

Action and Reaction on Different Masses

am

FBullet :am

FRifle :

Consider the recoil of a rifle…

Same Force

Page 4: Every action has an equal and opposite reaction
Page 5: Every action has an equal and opposite reaction

amF

JACOBS : am

FSafety :

Same force

Page 6: Every action has an equal and opposite reaction

Action and Reaction on Different Masses

Consider the launch of a space shuttle…

The shuttle continually recoils against the expelled gas from the rockets. No atmosphere is needed for this interaction.

Page 7: Every action has an equal and opposite reaction

Do Action and Reaction Forces Cancel?It depends on context…

If the car is the system, then the man is an external force acting against it. This action reaction does not cancel out. The external force of the road against the man accelerates the system.

BUT…

If the car and the man are the system, then the force pair is internal. This action reaction does cancel out.

Page 8: Every action has an equal and opposite reaction

Force and Friction

Page 9: Every action has an equal and opposite reaction

The Rickshaw Problem

Pull of man on rickshaw Pull of rickshaw on man

Push of man on ground

Push of ground on manFriction b/w cart wheels and ground

Acceleration is due to net force

Page 10: Every action has an equal and opposite reaction

The Rickshaw Problem

Net force on the rickshaw?

Push of ground on man - Pull of rickshaw on man

Push of man on ground – friction of ground on wheels

Pull of man – friction of wheels on ground

Net force on the man?

Net force on the ground?


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