Vocab
Force
pull or pull
Balanced forces
Forces that cancel each other out, so motion does
not change.
Also known as the law of
Inertia
The __________ of an object and the _________ pushing it determines how fast it moves.
mass, force
For every action, there is an ____________ and opposite reaction.
equal
Motion
when an object changes position
Unbalanced forces
Forces that are not equal and cause motion to
change.
A force can change an object’s:
direction, motion, speed
A ball has a mass of 2 kg and an acceleration of 3 m/s2.
What is the force?
6 N
Forces always come in pairs: one object ____________ and the other object ____________.
push, pull
Friction
slows down motion
Example of a collision with NO damage and why
?
An object at rest will stay at ______________ unless acted upon by a _________________
rest, force
Which object needs more force to accelerate: a light backpack or a heavy backpack? Why?
more mass
Explain how a rocket ship takes off
smoke down, rocket up
More mass = more
weight
Why might an object change shape when it collides with another object?
The force is large enough to deform the object
Give an example of inertia at rest
soccer ball on field
A shopping cart has a mass of 10 kg. If you push it with a force of 50 N, what is the acceleration?
a = F ÷ m = 50 ÷ 10 = 5 m/s2
A passenger’s body moves forward when a car suddenly stops. - what law is that?
1
acceleartion
change on speed or direction
What is the difference between an elastic and an inelastic collision?
Elastic - objects bounce off each other
Inelastic - objects stick together or change shape, damage
Why might a phone break (or not break)when you drop it?
material, force
Which would move FASTER if pushed with the same force?
bowling ball, soccer ball
bowling
A small ball and a large ball are kicked with the same force, but the smaller ball speeds up more.
What law is that?
2