P8.2 Forces between objects

Question 1

What makes a force a contact force

Answer 1

If two objects must touch each other to interact.

Question 2

What are some examples of contact forces

Answer 2

• friction
• air
• resistance
• tension

Question 3

What are some examples of non-contact forces

Answer 3

• magnetic force
• electrostatic force
• force of gravity

Question 4

What does Newtons third law of motion state

Answer 4

When 2 objects interact they exert equal forces on each other that act in opposite directions.

Question 5

What is the unit for force

Answer 5

Newtons (N)