Forces and it’s affects

Question 1

What is internal force?

Answer 1

It is generated by the contraction of skeletal muscles.

Question 2

What is external force?

Answer 2

It comes from the outside of the body and this is weight, reaction, friction and air resistance

Question 3

What are the five effects of force?

Answer 3

Force can create motion 
Force can accelerate a body 
Force can decelerate a body
Force can change the direction of a body
Force can change the shape of a body

Question 4

What is net force?

Answer 4

Net force is the overall force acting upon a body. Also known as the resultant force.

Question 5

What does it mean if the net force is 0

Answer 5

This means that all the forces are balanced, therefore there is no change in motion

Question 6

What does it mean and what happens when the forces are unbalanced?

Answer 6

This means that a net force is present and a body will either accelerate, decelerate, change direction or change shape

Question 7

What happens when the net force is positive?

Answer 7

A body will accelerate

Question 8

What happens when a net force is negative?

Answer 8

A body will decelerate

Question 9

Link Newton’s first Law of Inertia to net force:

Answer 9

If the net force = 0, forces are not present or they’re balanced. Newton’s first law of inertia states the body will be at rest or traveling at constant velocity.