A&P Motion & Movement

Question 1

What is angular motion?

Answer 1

A type of movement in a circular path around an axis of rotation

Question 2

The area of the body in contact with the floor. Widening this leads to an increase in stability

Answer 2

Base of support

Question 3

Define centre of mass

Answer 3

The point at which the body is balanced in all directions

Question 4

A type of force that is applied through the centre of mass. This will result in linear motion

Answer 4

Direct force

Question 5

An increase in velocity is called

Answer 5

Acceleration

Question 6

Define force

Answer 6

A push or pull that can change the direction or shape of an object. Measured in Newtons

Question 7

This is a combination of linear and angular motion, as seen in a 100m sprint

Answer 7

General motion

Question 8

The resistance of a body to change it’s state of motion

Answer 8

Inertia

Question 9

What comes through the centre of mass and if it passes through the base of support will lead to increased stability?

Answer 9

Line of gravity

Question 10

Define and give an example of linear motion

Answer 10

Is movement in a straight or curved line.
Straight- a skier travelling downhill in a straight line
Curved- a skeleton bob athlete sliding down the course

Question 11

Define Newton’s 1st law and give an example from golf

Answer 11

INERTIA- a body remains at rest or at a constant velocity unless a force acts upon it

A golf ball will remain on the tee until a force is applied to set it in motion (by the golf club)

Question 12

Define Newton’s 2nd Law and give an example from football

Answer 12

ACCELERATION- if mass of an object remains constant, applying a greater force will result in greater acceleration. The acceleration is proportional to the force applied and will act in the same direction.

The more force a player applies the the ball, the faster it will accelerate and the further it will travel

Question 13

Define Newton’s 3rd Law and give an example from sprinting

Answer 13

ACTION-REACTION- for every action there is an equal and opposite reaction.

As a sprinter applies force to the starting blocks, the blocks apply an equal and opposite reaction which propels the athlete forward.

Question 14

Using examples from football, list 3 functions that a force can have

Answer 14

Cause a body at rest to move- the ball from the penalty spot
Cause a moving body to change direction- playing a wall pass
Cause a moving body to accelerate- hooking a throw in down the line
Cause a moving body to decelerate- bringing a ball down with your instep
Change an object’s shape- the ball in the net will change the shape of the net

Question 15

More of these give a greater, more stable base of support

Answer 15

Points of contact

Question 16

What is created by an eccentric force or when the centre of mass moves outside the body?

Answer 16

Rotation

Question 17

What is a direct force?

Answer 17

A force that passes through an object’s centre of mass. It will result in linear motion

Question 18

What is an eccentric force?

Answer 18

Where a force is applied away from an object’s centre of mass. It will result in angular motion, or spin.

Question 19

The effect that a force has on an object depends on which 3 factors?

Answer 19

Size of the force (magnitude)
Direction of the force
Where the force is applied (direct or eccentric)

Question 20

_____________ is how difficult it is to disturb a body from a balanced position.

Answer 20

Stability

Question 21

The stability of an athlete is determined by which 3 factors?

Answer 21

Their:
Centre of mass
Base of support
Position of line of gravity

Question 22

To make an athlete less stable, what would you do to their:
Base of support
Centre of mass
Line of gravity

Answer 22

Base of support- narrow it
Centre of mass- raise it/move it outside the base of support
Line of gravity- move it outside the base of support