Forces and their Interactions

Question 1

What is interaction?

Answer 1

When two objects influence each other and cause a pair of forces to arise.

Like clapping hands

Question 2

What do forces cause?

Answer 2

Forces can cause change

Eg Kicking a football, change in speed, direction and shape!

Question 3

Examples of force effects?

Answer 3

1. Change in speed
2. Change in direction
3. Change in shape

Question 4

What is the difference between contact and non-contact forces?

Answer 4

Contact forces happen when two things are touching.

Non-contact forces happen when objects don’t touch.

Question 5

Examples of contact forces?

Answer 5

1. thrust
2. friction
3. air resistance
4. water resistance
5. normal contact
6. upthrust

Question 6

Examples of non-contact forces?

Answer 6

1. gravity force
2. magnetic force

Question 7

Free body force diagram

What kind of forces are shown?

Arrows to show size and direction of forces

Answer 7

• Upthrust (contact)
• Gravity (non-contact)

Arrows show the size + direction of forces. Same size? Boat stays level

Question 8

What is each force acting on? (The object)

Answer 8

The boat!

Question 9

What is causing each force?

Answer 9

• Water (up)
• Gravity (down)

Question 10

What is compression?

Answer 10

Two pushing forces cause compression - like squeezing a balloon

Question 11

What is tension?

Answer 11

Two pulling forces - like stretching an elastic band