Friction - Lesson 1

Friction - Lesson 1

Objective

• WWBAT DEFINE and IDENTIIFY the direction of force of friction

Agenda(40 mins)

• Rub your hands and observe - 5 mins

• Force definition and Friction as force - 10 mins

• Define Friction - 10 mins

• Direction of friction - 10 mins

• Problems

When you rub, what happend?

• Do you feel anything stopping the motion?

• While washing your hands with a stop, is it the same?

• What is different in both the cases?

What if force?

The pull or push of an object that changes the motion of a body is FORCE.

Multiple Choice

If these teams are pulling with the same amount of force what will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

Multiple Choice

A ____________ is a push or a pull on an object.

• friction

• force

• magnet

• gravity

Multiple Choice

What is the net force?

• 20 N 
• 0 N 
• 400 N 
• 40 N 

Multiple Choice

What is the net force?

• 3 N

• 3 N, right

• 17 N, right

• 3 N, left

Is friction a force?

YES.

Scenario - 1

Boy kicks a football

What does friction do?

It opposes the motion.

Friction Definition

The force which opposes the RELATIVE motion of two surfaces of bodies in contact is called Frictional Force.

Multiple Choice

Rougher surfaces have ...

• greater friction
• less friction
• the same level of friction

Multiple Choice

What does friction produce?

• light
• sound
• heat
• gravity

Multiple Choice

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

• similar
• opposite
• parallel
• west

Multiple Choice

When most objects with smooth surfaces rub, there is less friction.

• True
• False

Multiple Choice

The rougher the surface, the faster an object will travel over the surface.

• True
• False

Multiple Choice

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

Multiple Choice

TRUE or FALSE if you push a box across a surface like rough wood with a lot friction, it will NEVER stop

• TRUE, as long as it doesn't run into something it will keep going and going and going

• FALSE, it will stop very quickly

Multiple Choice

Friction _____________ motion

• Works in the same direction as

• Opposes

• Has not effect on

• Pulls against

Activity

Refern the image

Post work

Identify the force of friction and its direction and the interaction between bodies.