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