Biomechanical principles

Question 1

Newtons 1st law of linear motion

Answer 1

law of inertia- an object will remain at constant state of rest unless an external force is exerted upon it

Question 2

Newtons 2nd law of linear motion

Answer 2

Rate of body momentum is proportional to the force causing it and the change that takes place in the direction in which the force acts

force= mass x acceleration

Question 3

Newtons 3rd law of linear motion

Answer 3

To every action there is an equal and opposite reaction

Question 4

Scalar quantities

Answer 4

• speed
• distance
• mass
• temperature

Question 5

Speed

Answer 5

Speed (ms)= Distance covered (M) / time taken (S)

Question 6

Distance

Answer 6

Distance= speed x time

Question 7

Centre of mass

Answer 7

point of balance

Question 8

Factors affecting stability

Answer 8

1. height of centre of mass (lower the better)
2. mass of performer
3. area of support base
4. position of line of gravity

Question 9

Levers consist of

Answer 9

• Fulcrum
• resistance
• effort

Question 10

Fulcrum

Answer 10

point about which the lever rotates

Question 11

Resistance

Answer 11

weight to be moved by the lever system

Question 12

Effort

Answer 12

force applied by the user of the lever system

Question 13

First class lever

Answer 13

load - fulcrum - effort

Question 14

second class levers

Answer 14

fulcrum - weight - effort

Question 15

Third class lever

Answer 15

weight - effort - fulcrum

Question 16

Mechanical advantage

Answer 16

force arm is longer than the resistance arm

Question 17

Mechanical disadvantage

Answer 17

resistance arm is longer than the force arm