Week 5 - Linear Kinetics

Question 1

Mass

Answer 1

amount of matter in an object (kg)

Question 2

Weight

Answer 2

mass x acceleration (due to gravity, N)

Question 3

Gravity force (vertical)

Answer 3

-10m/s2

Question 4

Force

Answer 4

push/pull that changes the motion of an object

Question 5

What is the difference between attractive/contact forces?

Answer 5

Attractive - gravity (no contact)

Contact - starting block for runners (contact)

Question 6

What is Newtons’s Law #1?

Answer 6

1. Law of Inertia – every object remains in a state of rest or uniform motion in a straight line, unless acted on by a force, which is external and unbalanced

Question 7

What is Newton’s Law #2?

Answer 7

2. Law of Acceleration/resultant force – the translational acceleration of an object is proportional to the resultant external force acting on it and is in the same direction as this force (the force applied to an object causes acceleration)

Question 8

What is Newton’s Law #3?

Answer 8

3. Law of action/reaction – For every action, there is an equal and opposite reaction

Question 9

Ground reaction force means?

Answer 9

Force from ground to object that is in contact with ground

Question 10

The vertical ground reaction force takes up how much magnitude?

Answer 10

120%

Question 11

The anterior-posterior ground reaction force takes up how much magnitude?

Answer 11

20%

Question 12

The mediolateral ground reaction force takes up how much magnitude?

Answer 12

5%

Question 13

What is the centre of pressure?

Answer 13

The pressure around the foot during walking gait (heel to big toe)