05a. Biomechanics - Forces, stability and projectile motion

Question 1

Define linear motion

Answer 1

motion occurs in a straight line or curved path.

Question 2

Define angular motion

Answer 2

also known as rotation, motion occurs when a body moves along a circular path (around an axis)

Question 3

Define general motion

Answer 3

General motion involved both linear and angular motion.

Question 4

Define Mass

Answer 4

The amount of matter in a body

Question 5

Define Inertia

Answer 5

The resistance of a body to alter its state of motion

Question 6

Define Force

Answer 6

A push or pull on a body that alters its state of motion

Question 7

List the equation for weight

Answer 7

Mass x gravity

Question 8

List 3 examples of friction

Answer 8

Ground, Drag and air / wind resistance

Question 9

Define Acceleration

Answer 9

Acceleration is the rate of change of the velocity of an object

Question 9

Define distance

Answer 9

Distance is the path travelled from start to finish, regardless of direction

Question 10

Define displacement

Answer 10

Displacement is the difference between the initial position and final position of an object

Question 11

Angular Distance

Answer 11

Equals the angular distance covered by a rotating body

Question 12

Angular displacement

Answer 12

Equals the change between the initial and final position of a rotating object

Question 13

Define Speed

Answer 13

Speed is the rate of motion.

Question 14

Define velocity

Answer 14

Velocity measures the displacement an object experiences over time.

Question 15

Describe Centre of Gravity

Answer 15

The point at which all parts of an object are balanced.

Question 16

Describe Base of Support

Answer 16

The area of an object or person that is in contact with the ground

Question 17

Describe Line of gravity

Answer 17

Imaginary line which passes through the centre of gravity and continues down into the centre of an objects base of support

Question 18

List the factors that influence the air resistance a projectile will be subject to.

Answer 18

Mass, shape, surface area, nature of surface area, gravity

Question 19

List the three factors that effect projectile motion

Answer 19

Height, angle and speed of release

Question 20

What is an imaginary line which passes through the centre of gravity and continues down into the centre of an objects base of support called?

Answer 20

Line of gravity

Question 21

What is the area of an object or person that is in contact with the ground called?

Answer 21

Base of support

Question 22

What is the point at which all parts of an object are balanced called?

Answer 22

Centre of gravity

Question 23

What is motion that occurs in a straight line or curved path called?

Answer 23

Linear motion

Question 24

What is motion that occurs when a body moves along a circular path (around an axis) called?

Answer 24

Angular motion

Question 25

What is difference between distance and displacement?

Answer 25

Distance is a measure of path travelled whereas displacement is a measure that compares starting to finishing position.

Question 26

In a 400m sprint around the oval what is the distance and displacement?

Answer 26

Distance = 400m
Displacement = 0m

Question 27

If the landing height is lower than the release height then angle of release should be?

Answer 27

lower than 45 degrees

Question 28

If the landing height is higher than the release height then angle of release should be?

Answer 28

greater than 45 degrees

Question 29

If the landing height and release height are similar, what should the angle of release be?

Answer 29

approx. 45 degrees