Newtons laws

Question 1

What is linear motion ?

Answer 1

Motion in a straight or curved line where all body parts are all moving at the same speed, distance and direction.
E.g. = the 100m sprint

Question 2

What is newton’s first law ?

Answer 2

• ‘the law of inertia’
• If an object is at rest it will stay at rest.
• If an object is in motion it will continue to move at the same velocity until a force is applied
• The bigger the mass, the larger the inertia will be which means a larger force is needed to change the state of motion

Question 3

What are push and pull ?

Answer 3

• They can alter a body in multiple ways:
  1. Causes a body to move
  2. Causes a body to accelerate
  3. Causes a body to decelerate
  4. Causes a body to change direction
  5. Causes a body to change shape (e.g a golf ball changes shape when hit)

Question 4

What is newton’s second law ?

Answer 4

• The size and direction of a force applied to the body determine the size and direction of acceleration
• The rate of acceleration is directly proportional to the force
• The masses involved remain constant and then acceleration is equal to the size of the force causing it
• E.g. If you kick a football hard, it will go far
• Every object has a mass and veloci and the product is momentum

Question 5

Equation of momentum ?

Answer 5

Momentum = mass * velocity

Question 6

Equation for Newton’s second law ?

Answer 6

Force = mass * acceleration

Question 7

What is Newton’s 3rd law ?

Answer 7

• ‘Every action has an equal and opposite reaction’
• This always occurs in pairs
  E.g. a sprint start
  Action = Athlete pushing on the blocks
  Reaction = Blocks push athletes forwards

Question 8

What is a ground force reaction ?

Answer 8

• A force exerted on the ground by the body in contact with it