Friction is a force that —
Opposes motion
Transfers mass
Speeds objects up
Stores energy
A ball sitting at the top of a ramp has what kind of energy?
Potential
Net
Thermal
Kinetic
Which situation shows a collision with energy transfer?
A car rolling down a ramp
Two soccer balls hitting each other
A ball sitting at the top of a hill
A book resting on a desk
When an object moves faster, it has —
Greater speed
No motion
Less kinetic energy
More friction
Why do car tires have grooves (tread)?
To reduce mass
To increase friction
To store energy
To make cars faster
A toy car goes down a ramp covered with sandpaper. Compared to a smooth ramp, the car will —
Have more potential energy
Slow down sooner
Move with no friction
Travel farther
Motion is always described by —
Height and weight
Speed and direction
Mass and position
Energy and force
What is the combination of all forces acting on an object called?
Net Force
Kinetic Energy
Gravity
Friction
Which of these is an example of potential energy?
A book resting on a high shelf
A soccer ball rolling
A light bulb glowing
A child swinging on a swing
When the ball rolls down the ramp, its energy changes to —
Mass
Friction
Stored
Kinetic
In a bumper car crash, the motion of the cars changes because —
Energy transfers
Mass increases
Friction disappears
Gravity is stronger
Two students push a box in the same direction. What happens?
The box moves faster
The forces cancel out
The box slows down
The box doesn’t move
A runner starts north, then turns east. What changed?
Energy stayed the same
Mass
Speed
Direction
If an object keeps moving in the same direction at the same speed, the net force is —
Negative
Greater than zero
Increasing
Zero
A heavy marble hits a lighter marble. What happens?
Nothing changes
Energy disappears
The heavier marble speeds up
The lighter marble moves more
When two objects collide, energy —
Increases mass
Is destroyed
Transfers from one to another
Stops completely
Two students push a toy car with equal force in opposite directions. What happens?
The car gains kinetic energy
The car doesn’t move
The car speeds up
The car moves forward
Which surface would cause the most friction?
Ice
Smooth tile
Wet floor
Carpet
Which of these shows kinetic energy?
A runner crossing the finish line
A book on a shelf
A stretched rubber band
A parked car
If a car travels 20 meters in 4 seconds, it is describing —
Mass
Speed
Friction
Energy