Show:
Force
Friction
More Friction and Force
Gravity
Free Fall
100

causes a skater sliding on the ice to gradually slow down

What is friction?

100
pushing a box that is at rest
What is static friction?
100
friction between a car's windshield and the air as you drive
What is kinetic friction?
100

The gravitational force is also known as this. 

What is weight?

100
what force acts on an object in free fall
What is gravity?
200
A seatbelt helps you when your car stops suddenly by providing this
What is unbalanced rearward force?
200
taking notes with a pencil
What is sliding friction?
200
when the normal force increases what is the change on friction
What is increases?
200

To calculate the gravitational force of an object, you multiple what two things? 

Mass and the acceleration of gravity

200
this is the same for all objects near Earth's surface?
What is free-fall acceleration?
300
When net force is zero the object is at rest and has this type of force
What is balanced force?
300
rolling a ball across a desk
What is rolling friction?
300
friction between he air and the surface of a moving object
What is fluid friction?
300
the downward force exerted on an object due to gravity
What is weight?
300
when air resistance balances weight of an object that is falling, the velocity...
What is remains constant?
400
SI unit for force is this
What is newton?
400
engine parts wearing down is an example of
What is harmful friction?
400

When a lubricant is added between surfaces.

When does friction decrease?

400
amount of matter in an object
What is mass?
400

This is the friction that we normally ignore in free fall

What is air resistance?

500
the combination of all the forces acting on an object
What is net force?
500
force that opposes motion between two surfaces that are touching
What is friction?
500

force is a quantity made up of

What is magnitude and direction?

500
when an object is falling to the Earth due to gravity what sign does the gravitational force have
What is negative?
500

acceleration due to gravity

About 10 m/s2