Biomechanics >:(

Question 1

How is force created?

Answer 1

By a push or a pull

Question 2

What does force do?

Answer 2

Causes an object to:
-Start moving
-Speed up
-Slow down
-Stop
-Change direction

Question 3

What is the formula for force?

Answer 3

Force=Mass x Acceleration

Question 4

Define linear motion

Answer 4

Refers to the movement of a body along a straight or curved line

Question 5

Define angular motion

Answer 5

Refers to the movement of a body about a fixed axis

Question 6

What happens when the same force is applied to two objects?

Answer 6

The lighter one (less mass) will travel faster (with greater acceleration)

Question 7

How does torque occur?

Answer 7

When a force causes an object to rotate or turn

Question 8

What does torque do?

Answer 8

Causes changes in angular motion

Question 9

What is the formula for torque?

Answer 9

Torque= Force x Lever arm

Question 10

What does eccentric force do?

Answer 10

Causes an object to rotate

Question 11

What is eccentric force?

Answer 11

Force that is applied away from an object’s centre of gravity

Question 12

What is the formula for linear velocity?

Answer 12

Linear velocity = radius of rotation x angular velocity

Question 13

What is the formula for momentum?

Answer 13

Momentum = mass x velocity

Question 14

Define momentum

Answer 14

Amount of motion an object has, and its resistance to changing that motion

Question 15

Define moment of inertia

Answer 15

Measure of an object’s resistance to change its angular motion
(resistance to rotate)

Question 16

What is the formula for moment of inertia?

Answer 16

Moment of inertia = mass x radius²

Question 17

What is the formula for angular momentum?

Answer 17

Angular momentum = Moment of inertia x angular velocity

Question 18

How does an athlete increase moment of inertia?

Answer 18

By moving body parts away from an axis of rotation

Question 19

What is the relationship between moment of inertia and angular velocity?

Answer 19

When one increases, the other decreases.
Angular momentum remains unchanged

Question 20

How do you create a change in momentum?

Answer 20

By applying a force

Question 21

Define conservation of momentum

Answer 21

The total momentum of objects before a collision is equal to the total momentum after collision

Question 22

Define impulse

Answer 22

The change in momentum of an object

Question 23

What is the formula for impulse?

Answer 23

Impulse = Force x time

Question 24

How is impulse manipulated?

Answer 24

-a large force being applied over a very short period of time (e.g. gymnast landing with ‘stiff’ knees)
-a small force being applied over a longer period of time (e.g. gymnast landing with ‘bent’ knees)

Question 25

Define summation of momentum

Answer 25

The sequential and movement of multiple body parts to produce maximum velocity

Question 26

Define velocity

Answer 26

Measure of how far and in what direction an object travels in a given time

Question 27

Define speed

Answer 27

Measure of how fast an object travels in a given time

Question 28

How does a change of velocity occur?

Answer 28

-changing speed -changing direction -both

Question 29

How is constant velocity maintained?

Answer 29

The object has to travel at a constant speed in a constant direction (NO change in acceleration)

Question 30

Define displacement

Answer 30

The change in position from start to finish (taking direction into account)

Question 31

What are the names of Newton's three laws of (linear) motion?

Answer 31

1st: Law of Inertia 2nd: Law of Acceleration 3rd: Law of Action-Reaction

Question 32

What is the Law of Inertia?

Answer 32

"An object will remain at rest or in its current state of motion unless acted upon by an external force."

Question 33

What is the Law of Acceleration?

Answer 33

"The 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 34

What is the Law of Action-Reaction?

Answer 34

"For every 'action' there is an equal and opposite 'reaction' force."

Question 35

Define inertia

Answer 35

Tendency of an object to resist change in its state of motion

Question 36

How does mass affect inertia?

Answer 36

Greater an object's mass, the greater the resistance it has to change and therefore, the greater the force required to change its state of motion

Question 37

Define acceleration

Answer 37

The rate of change in a object's velocity

Question 38

How does mass affect acceleration?

Answer 38

If the same force is applied to different bodies, the lighter one (less mass) will have greater acceleration

Question 39

What is projectile motion?

Answer 39

Looks at the factors that influence the flight path of a projectile

Question 40

What is a projectile?

Answer 40

An airborne body