Biomechanical Movements

Question 1

Newton’s first law

Answer 1

An object will remain at rest or continue to move with constant velocity unless acted upon by a resultant force for example when the football is kicked it will continue to travel in that direction until a force acts upon it like a goalkeeper save

Question 2

Newton’s second law

Answer 2

The net force acting on an object is directly proportional to the rate of change change of its momentum and is in the same direction. The more force kicked on the ball by footballer, the greater acceleration of the ball. Force = Mass x Acceleration

Question 3

Newton’s third law

Answer 3

When two objects interact they exert equal opposite forces on each other. For example when a footballer jumps up to win a header, a force is exerted on the ground to gain height. At the same time, the ground exerts an upward force upon the player.

Question 4

When Usain Bolt ran his world record 100m, his acceleration out of the blocks was 9.5m/s. Work out the force at work on Bolt who has a mass of 94kg
Answer should be in newtons

Answer 4

Force = mass x Acceleration
F = 94kg x 9.5m/s
=893N

Question 5

Position of the centre of mass

Answer 5

The point of balance

Question 6

Line of gravity

Answer 6

Line downwards from th centre of mass

Question 7

Base of support

Answer 7

Between feet o ground

Question 8

First class lever

Answer 8

L, F, E

Question 9

Second class lever

Answer 9

F, load, effort

Ankle

Question 10

Third class lever

Answer 10

L, E, F

Hip, knee