Physics - Chapter 5 - Newton's Third Law

A force ___________ to the system is needed for acceleration

external

if action is a foot kicking a soccer ball (foot to ball), the reaction is an equal force on the

foot

Forces occur in

force pairs

When you jump vertically upward, strictly speaking, you cause the earth to

move downward

An interaction requires a _________ of forces acting on ________separate objects

pair two

A force is a push or pull that is required to change the

state of motion of an object

A boulder falls due to gravity. The reaction to the force on the boulder is

the boulder pulling UP on earth

A child can pull a wagon down the road because:

the ground provides a force on the child

Force that propels a heavy truck along a highway is provided by

the highway pushing back on the wheels of the truck

Earth pulls on the Moon with a certain force. Relative to this force, the pull of the moon on the earth is

the same

A mosquito has a collision with a the windshield of a massive high speed truck. The force impact on the mosquito is ____________ the force on the truck and the acceleration of the mosquito is_____________the acceleration of the truck

the same as, more than

A force interaction requires at least

2 forces

An axe is swung against a tree with a blow of 4000 N. The force that acts on the axe during this event is

4000N

the amount of force with which a boxers punch lands depends on the

mass of whats being hit

State newton's third law

For every action, there is an equal and opposite reaction.

Why doesn't a force exerted by your foot on a soccer ball cancel the force exerted by the ball on your foot?

You cant cancel a force on something with a force on something else

When a squid pushes against water, the squid moves forward because the water

exerts a net foward force

when the neck of an air filled ballon is untied and air escapes, the balloon shoots through the air. The force that propels the balloon is provided by the

ejected air

Two identical carts have a compressed spring between them. When the spring is released, carts recoil from each other with oppositely directed accelerations that are

equal

Every force is part of an ___________between one thing and another

interaction

Whenever one object exerts a force on a second object, the second object exerts a force on the first that

is opposite in direction, equal in size, occurs at the same time

The net force on a kicked soccer ball can be zero when

it is kicked by two feet with equal and opposite amounts of force.

A given force exerted on a small mass produces a ___________ While the same force exerted on a large mass produces a ___________

large acceleration small acceleration

A massive truck and a golf cart have a head on collision with equal amounts of force. The least amount of acceleration occur for

the truck

Why can't you move your car if you push on the dashboard while you are sitting in the car?

you are internal to the system