The law itself
Newtons Third law states: For every___, There is an equal and opposite___
Action,Reaction
You jump off a small boat and it drifts backward. Which law explains this?
Newton’s Third Law
Identify the action and reaction: a hammer hits a nail.
Action—hammer on nail; Reaction—nail on hammer)
Do action-reaction pairs cancel each other?
No, because they act on different objects
You push on a wall and it doesn’t move. Does Newton’s Third Law still apply?
Yes, the wall pushes back with equal force
What scientists formulated the three laws of motion?
Issac Newton
When a bird flaps its wings down, the air pushes the bird ____.
Upward
You sit on a chair. What’s the reaction force?
The chair pushes up on you)
If a truck hits a car, which experiences the greater force?
Both experience equal force
Why do you move backward when firing a gun?
The bullet pushes forward, and the gun pushes backward on you
True or False: Forces in a third-law pair act on the same object.
False
When you walk, your foot pushes backward on the ground. What pushes you forward?
The ground pushes forward on you
A car’s tires push backward on the road. The road pushes the car ____.
Forward
Why does the car accelerate more than the truck in a collision?
It has less mass, so more acceleration for the same force
If two skaters push each other, what happens?
They move in opposite directions with equal and opposite forces
What do we call the “push or pull” that results from interaction between objects?
A force
Rockets launch by expelling gas downward; what happens to the rocket?
It moves upward
A baseball bat hits a ball. What is the reaction force?
The ball pushes back on the bat
The Earth pulls on you with gravity. What’s the reaction force?
You pull on Earth with the same force
Why can’t you move forward by pushing on the air?
The air’s reaction force is too weak to move you significantly
What unit measures force in the SI system?
The Newton
A swimmer pushes water backward with her hands; what’s the reaction force?
The water pushes her forward
When a balloon releases air, what’s the reaction direction of the balloon?
Opposite to the air’s direction
If a mosquito hits your arm, which one experiences a bigger acceleration?
The mosquito, because it has much less mass
Why do astronauts float while throwing objects in space?
The object pushes back on them with equal force, causing them to drift