TURNING FORCES

• Physics
• Secondary Education
• Age 13

Forces and Motion

Lesson 06. 

TURNING FORCES

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Highlights of the Day

• identify and calculate turning forces (moment = force x distance)

• Values :  Responsibility and Determination

Think about...

Give one example of
something that are turned
by forces.

Forces and Motion

Lesson 06. 

TURNING FORCES

Forces and Motion

Lesson 06. 

TURNING FORCES

00:21

A moment is a turning force around a fixed ___________.

1. pivot
2. lever

00:26

Which of the following CANNOT be a pivot?

1. nut
2. middle of the seesaw
3. hinge
4. table

00:32

What is the result of one moment acting?

1. applied force
2. turning force
3. rotating force

00:36

If something is balanced, the moments are equal and ________.

1. in the same direction
2. opposite

00:50

Moment of a force = force x ___________

1. perpendicular distance
2. linear distance
3. parallel distance
4. circular distance

01:37

What is the unit of MOMENT?

1. newton-meter (Nm)
2. meter (m)
3. newton (N)

01:41

What is the unit of force?

1. newton (N)
2. meter (m)
3. newton-meter (Nm)

01:43

What is the unit of distance?

1. newton (N)
2. meter (m)
3. newton-meter (Nm)

01:59

The moment exerted is 12Nm. What is the turning force?

1. F = 6 N
2. F = 12 N
3. F = 0.5 N

02:16

What are two types of moments in a seesaw?

Turning Effects of Forces

• When you push down on a door handle, the handle turns.
• When you push down on the pedal of a bicycle, the crank arm turns.
• When you pull on a door, the door turns toward you. 

Turning Effects of Forces

• The object that turns is called a lever.
• The point around which the lever turns is called the pivot.

QUESTION TIME!

Calculating Moments

Equation for Moment

Moment = F x d

Equation for Moment

Example

Practice

Problem 1

Problem 2

Summary

Self-survey: Rate your level of understanding and participation in this lesson.

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