Collisions
True or false, when objects collide they both experience a force
True
Name one way an object’s motion can change.
Start moving, stop moving, change direction, speed up or slow down
What is mass?
The amount of matter in an object (how heavy or light something is)
Speed in a particular direction
True or False, Force strength in a collision depends on the mass of the objects
True or false, a bike on grass is a form of friction
True
If you push a soccer ball and a bowling ball with the same force, which one changes velocity more?
The soccer ball
What is required to change the velocity of an object?
A force
When a bowling ball and a tennis ball collide with the same strength of force, which object will experience the greater change in velocity?
Tennis Ball
If a force is applied in the opposite direction of motion, what happens?
It's velocity changes (slows down or stops)
If a heavy object and a light object both change speed by 5 m/s, which required more force?
The heavier object
If a force is applied in the same direction as motion, what happens to velocity?
It increases
Which law of motion explains collision forces?
Third: Equal and opposite reactions
what is a balanced force?
forces that cancel each other out
True or False, an object has the same mass no matter where it is in the universe
True
A car travels 100 meters east in 10 seconds. What is its velocity?
10 m/s
What is an elastic collision?
no kinetic energy is lost as objects bounce off each other
What is Newton's law of inertia?
Newton's first law (object at rest stays at rest)
An astronaut weighs less on the Moon than on Earth.
Why?
Because the Moon has less gravity, so the force of gravity on the astronaut is smaller.
A runner goes 400 meters around a track and ends where they started in 80 seconds.
What is displacement?
0 m