# Intro to Forces

What is a force?
1 / 30
Slide 1: Mind map
Mechanical principlesFurther Education (Key Stage 5)

This lesson contains 30 slides, with interactive quizzes and text slides.

Lesson duration is: 60 min

## Items in this lesson

What is a force?

#### Slide 1 -Mind map

Forces
• A force is a push or a pull that impacts the motion of an object.
• Force is measured in newtons (N).
• To fully define a force, you need to know both its magnitude in Newtons and its direction

#### Slide 2 -Slide

A bullet is shot straight up into the air. Why doesn't it continue out to space?

#### Slide 3 -Mind map

A constant force is needed to maintain constant movement.
True
False

#### Slide 4 -Poll

A ball is travelling through the air after being thrown. What forces act on the ball?
A
The force that was used to throw the ball
B
Air resistance
C
The weight of the ball
D
Thrust

#### Slide 5 -Quiz

A stone slides across a horizontal sheet of ice after being pushed with a stick. What forces are acting on the stone?
A
A frictional force
B
The force from the stick that was used to push it
C
Its weight
D
A vertical force from the ice.

#### Slide 6 -Quiz

A book is resting on a horizontal table. What forces are acting on the book?
A
Its weight
B
Friction
C
A reaction force from the table
D
Tension

#### Slide 7 -Quiz

An object is hanging from a string. What forces act on the object?
A
Its weight
B
Air resistance
C
A reaction force
D
Tension from the string

#### Slide 8 -Quiz

Weight vs Mass
• Mass is measured in kilograms. It is a measure of how much matter there is in an object.
• Weight is measured in Newtons. It is the amount of force an object exerts due to the pull of gravity.
• Mass x Gravity = Weight
• Weight ÷ Gravity = Mass

#### Slide 9 -Slide

The weight of an object is the same on the Moon as on Earth.
A
True
B
False

#### Slide 10 -Quiz

The mass of an object is the same on the Moon as on Earth.
A
True
B
False

#### Slide 11 -Quiz

Which of the following statements is true?
A
The force on an object from a string attached to the object can be either tension or thrust.
B
The force on an object from a string attached to the object can be tension but not thrust.
C
The force on an object from a string attached to the object can be thrust but not tension.

#### Slide 12 -Quiz

Which of the following statements is true?
A
The force on a trailer from a towbar can be thrust but not tension.
B
The force on a trailer from a towbar can be tension but not thrust.
C
The force on a trailer from a towbar can be either tension or thrust.

#### Slide 13 -Quiz

An object is placed on a rough surface which has a slight slope, but not enough for the object to move, so friction does not act.
A
True
B
False

#### Slide 16 -Drag question

What forces are acting?

#### Slide 17 -Slide

What forces are acting?

#### Slide 18 -Slide

What forces are acting?

#### Slide 19 -Slide

Representation of forces
Forces can be represented by space diagrams or free body diagrams.

#### Slide 20 -Slide

The box to the left is sliding down a slope at a constant speed. Draw a free body diagram showing the box with 5N friction, 6.7N reaction force, and 10N weight.

#### Slide 21 -Slide

The boat has weight 5000N, upthrust 5000N, thrust 800N and air resistance 200N. Draw a free body diagram showing the forces and determine if the boat is in motion.

#### Slide 22 -Slide

What type of force acts at a distance without physical contact?
A
Non-contact force
B
Air resistance force
C
Contact force
D
Spring force

#### Slide 23 -Quiz

Which force allows magnets to attract or repel objects?
A
Normal force
B
Magnetic force
C
Gravitational force
D
Electrostatic force

#### Slide 24 -Quiz

What is an example of a non-contact force?
A
Frictional force
B
Magnetic force
C
Applied force
D
Tension force

#### Slide 25 -Quiz

Which of the following is not a contact force?
A
Friction
B
Gravity
C
Normal
D
Tension

#### Slide 26 -Quiz

What happens to the gravitational force between two objects when the distance between them increases?
A
Decreases
B
Increases
C
Reverses
D
Remains constant

#### Slide 27 -Quiz

What is the force that pulls objects towards the Earth?
A
Friction
B
Magnetism
C
Gravity
D
Electricity

#### Slide 28 -Quiz

Who formulated the law of universal gravitation?
A
Nikola Tesla
B
Albert Einstein
C
Isaac Newton
D
Galileo Galilei

#### Slide 29 -Quiz

What determines the strength of the force of gravity between two objects?
A
Temperature and speed
B
Volume and texture
C
Color and shape
D
Mass and distance