Friction

Friction is a force that acts in a ___________ direction of movement.

• paired

• opposite

• perpendicular

• parallel

The Force due to Gravity (Fg) is also known as _____.

• Weight

• Mass

• Friction

• Applied Force

Tags

NGSS.MS-PS2-4

Normal Force (Fn) is equal to _________.

• Force of Gravity (Fg)

• Applied Force (Fa)

• Frictional Force (Ff)

• Air Resistance (Fair)

An 5 kg book is lying motionless on a table. Which of the following statements is true?

• The force due to gravity (Fg) on the book is equal to the normal force (Fn).

• The force due to gravity (Fg) on the book is greater than the normal force (Fn).

• The force due to gravity (Fg) on the book is less than the normal force (Fn).

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Friction results from uneven surfaces ...

• in contact with each other.

• NOT in contact with each other.

Static Friction is friction of...

• stationary objects

• moving objects

Kinetic Friction is friction of...

• stationary objects

• moving objects

Which type of friction requires a GREATER force?

• Static Friction

• Kinetic Friction

The friction between two surfaces can be given as a ratio of the frictional force (Ff )to the normal force (Fn ). This is called ____________.

• coefficient of friction

• applied force

• force of gravity

• weight

The coefficient of friction has not unit of measurement.

• TRUE

• FALSE