What is Friction?
What is friction?
The force that resists motion between two surfaces.
Which has more friction: ice or sandpaper?
Sandpaper.
What force pulls everything toward the ground?
Gravity.
What force makes it harder to move an object?
Friction.
Why do ice skaters move quickly on ice?
Ice has very low friction.
Does friction make objects move faster or slower?
Slower.
Name a surface that has low friction.
Ice, tile, smooth glass, etc.
What happens to an object when there is no friction?
It keeps moving until something stops it.
What happens to an object when more force is applied to it?
It moves faster
What happens if you try to slide on grass with socks versus on a wooden floor?
The grass creates more friction and slows you down
What happens when you rub your hands together quickly?
They get warm because of friction.
Why do race car tires have grooves?
To create more friction and grip the road
Why does a marble slow down when rolling on a rough surface?
More friction is acting on it.
If you push a toy car on a smooth surface and a rough surface, which one will go farther?
The smooth surface.
Why do we put salt on icy roads in winter?
To increase friction and make roads less slippery
True or False: Friction only happens when two objects touch.
True.
What would happen if there was no friction between your shoes and the ground?
You would slip and fall!
What is Newton’s First Law of Motion?
An object in motion stays in motion unless acted on by another force.
What force pulls objects back to the ground when they fall?
Gravity.
How does friction help a pencil write on paper?
The rough surface of the paper creates friction with the graphite, leaving a mark.
Name one way friction is helpful in everyday life.
e.g., walking, braking a bike, gripping objects.
Why do astronauts in space have trouble stopping their movement?
There is no friction in space to slow them down.
If a car is moving and suddenly stops, why do passengers feel like they are still moving?
Because of inertia – Newton’s First Law.
If two objects of different weights fall at the same time, which one hits the ground first?
They hit at the same time, unless air resistance affects them.
What type of friction helps a car’s brakes slow it down?
Sliding friction between the brake pads and wheels