Balanced And Unbalanced Forces

Question 1

Definition of external force

Answer 1

A force that comes from outside the body
Vertical-weight and reaction
Horizontal- friction and air resistance

Question 2

Definition of net force

Answer 2

The overall force acting on a body when all the other individual forces have been considered
Dictates the direction of motion

Question 3

Definition of Balanced forces

Answer 3

When two forces acting on a body are equal in size but opposite in direction
The body will remain stationary or at uniform velocity, net force=0

Question 4

Definition of unbalanced forces

Answer 4

When a force acting in once direction is greater in size than the force acting in the opposite direction
The body will accelerate (+ve net force) or decelerate (-ve net force)

Question 5

Which of Newton’s laws links with being stationary?

Answer 5

Newton 1

Law of inertia

Question 6

Which 2 of Newton’s laws are best to talk about when something is moving?

Answer 6

Newton 1 (inertia)
Newton 2 (acceleration)

Question 7

Which newton laws can you talk about when someone is jumping?

Answer 7

Newton 3 (reaction)
Newton 2 (acceleration)
Newton 1 (inertia)

Question 8

Definition of reaction force

Answer 8

Equal and opposite force exerted by a body in response to the action force placed upon it.

Question 9

Definition of friction

Answer 9

The force that opposes the motion of 2 surfaces in contact

Question 10

Definition of air resistance

Answer 10

Force that opposes the motion of a body travelling through air

Question 11

Definition of weight

Answer 11

Gravitational pull that the earth exerts on a body

Question 12

What are the 6 things to include in a commentary of a free body diagram?

Answer 12

Horizontal or vertical 
What the forces are
Equal/unequal
Net force (+ve/-ve)
Acceleration/deceleration
Newton law it links to