Biomechanical Principles for Analysis of Movement (Part 3)

Question 1

What is Newton’s first law?

Answer 1

The law of inertia:

- A body will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

Question 2

What is Newton’s second law?

Answer 2

The law of force and acceleration:
- A force applied to an object will produce a change in motion (acceleration) in the direction of the applied force that is directly proportional to the size of the force.

Question 3

What is Newton’s third law?

Answer 3

The law of action-reaction:
- When two objects come in contact with one another, they exert forces that are in equal in size but opposite direction on each other - for every action there is an equal and opposite reaction.

Question 4

What is a torque?

Answer 4

A rotational force (a push or pull) that makes an object rotate.

(Used in angular motion).

Question 5

What is linear motion?

Answer 5

Linear motion:

- Is the movement of the body along a straight or curved path.

Question 6

What is projectile motion?

Answer 6

• An object or body that is launched into the air and affected only by forces of gravity and air resistance.

Factors that affect projectile motion:

• Angle of release
• Speed of release
• Height of release