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.
How many planets are in our Solar System?
8
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Pluto is now a Dwarf Planet
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 force pulls objects back to the ground when they fall?
Gravity.
In terms of land mass, this is the largest country in the world
What is Russia
If you push a toy car on a smooth surface and a rough surface, which one will go farther?
The smooth surface.
What would happen if there was no friction between your shoes and the ground?
You would slip and fall and never stop sliding until you slammed into something!
What is Newton’s First Law of Motion?
An object in motion stays in motion unless acted on by another force.
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.
This is the name of the genetic material in your body that determines what genes or traits you carry and pass on to your children
DNA
Deoxyribonucleic Acid
True or False: Friction only happens when two objects touch.
True.
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.
A box is pushed with a force of 20N across a floor with a frictional coefficient of 0.75. What is the Normal Force acting on the box?
15N
There are only 3 words in the English language that begin with the letters DW. Name 1 of them
Dwell, Dwarf, Dwindle
Name one way friction is helpful in everyday life.
e.g., walking, braking a bike, gripping objects.
A 5kg rubber ball rolls against Titanium and has a frictional Coefficient of 0.416
The same 5kg rubber ball rolls against Oak wood and has a frictional Coefficient of 0.512
Which surface has the higher friction
Oak Wood
A snowman on concrete has a frictional coefficient of 0.25 and has a normal force of 8N
What is the Frictional Force needed to move the snowman?
2N
A 20 kg log is laying on the ground. What is the gravitational force the log is exerting and what is the normal force of the log?
~196N
This is the only fruit with the seeds on its outside!
The Strawberry