Biomechanical principles

Question 1

Net force

Answer 1

the sum of all the forces acting on a body.

Question 1

Internal force

Answer 1

comes from inside the body and is generated by skeletal muscles

Question 2

External force

Answer 2

comes from outside the body.

Question 3

Vertical force 1

Answer 3

weight - gravitational force that the earth exerts on the body measured in (n)
weight = mass x acceleration

Question 4

Vertical force 2

Answer 4

reaction force - the equal and opposite force exerted by a body in response to the action force acted on it.

Question 5

Horizontal force 1

Answer 5

frictional force
static - dry friction acting between two stationary surfaces
sliding - the resistance created by two objects sliding against each other.

Question 6

Horizontal force 2

Answer 6

air resistance - a force that acts in the opposite direction of the motion of a body travelling through the air (n)

Question 7

Factors affecting air resistance

Answer 7

• velocity of object
• cross sectional area
• shape and surface characteristics of the body.