Biomechanics - Newton's Laws

Question 1

Newton’s 1st Law

Answer 1

Inertia - an object will remain at a state of reset or moving at constant velocity unless acted upon by an external force

Question 2

Newton’s 2nd Law

Answer 2

Acceleration - a body’s rate of change in momentum is proportional to the size of the force applied and acts in the same direction as the force applied

Question 3

Newton’s 3rd Law

Answer 3

Reaction - for every action there is an equal and opposite reaction

Question 4

Vertical Forces

Answer 4

Weight - (N) acts from the centre of mass downwards

Reaction - (N) is the equal and opposite force exerted by a body in response to the force applied to it

Question 5

Horizontal Forces

Answer 5

Friction - (N) is the force that opposes the motion of two surfaces in contact

Air Resistance - (N) is a force that opposes the motion of a body travelling through the air

Question 6

Equations:
Velocity
Acceleration
Momentum
Force
Weight

Answer 6

Velocity = displacement / time taken
Acceleration = (final - initial velocity) / time taken
Momentum = mass x velocity
Force = mass x acceleration
Weight = mass x acceleration due to gravity

Question 7

Net Force

Answer 7

is the sum of all forces acting on a body, also termed resultant force. It is the overall force acting on a body when all individual forces have been considered

Question 8

Balanced and Unbalanced forces

Answer 8

Balanced - these occur when two or more forces acting on a body are equal in size and opposite in direction.

Unbalanced - these occur when two or more forces are unequal in size and opposite in direction.