3. Forces and Motion

Question 1

What is Newton’s First Law?

Answer 1

• if the forces on an object are balanced, the object will:
  1. Continue travelling at a constant velocity
  2. Or if stationary -> will remain stationary

Question 2

The same force is applied to two objects with different masses. Which will accelerate the most?

Answer 2

Lower mass object

Question 3

Two objects of same mass are pulled with different forces. Which will accelerate the most?

Answer 3

Object pulled with higher force

Question 4

What is Newton’s second law?

Answer 4

Resultant force= mass x acceleration

F= ma

Question 5

How can friction be reduced?

Answer 5

Lubrication eg oil for friction

Streamlined design for air resistance

Question 6

What is an example of useful friction?

Answer 6

Brakes on a car

Question 7

What is an example of unuseful friction/

Answer 7

Air resistance slowing a plane

Question 8

What is Newton’s 3rd law?

Answer 8

If A exerts a force on B, then B exerts the same force on A but in the opposite direction