Linear motion

Question 1

Scalar

Answer 1

Measurements that only have magnitude (size).

Question 2

Vector

Answer 2

Measurements that have magnitude (size) and direction.

Question 3

Examples of a vector

Answer 3

Weight, acceleration, displacement, velocity and momentum.

Question 4

Examples of a scalar

Answer 4

Mass, distance and speed.

Question 5

Describe how vectors are usually represented

Answer 5

• With the use of an arrow.
• The longer the arrow, the greater the size.
• Direction is shown by point and line of application

Question 6

What is mass and how is it measured.

Answer 6

The quantity of matter the body possesses.
Measured in KG.

Question 7

How is weight different to mass

Answer 7

Weight is the force on a given mass due to gravity
Measured in N

Question 8

How to calculate Weight

Answer 8

Weight (N) = Mass (Kg) x Gravity (9.8)

Question 9

Distance

Answer 9

The path a body takes as it moves from start to finish

Question 10

Displacement

Answer 10

Shortest route in a straight line between start and finish

Question 11

Speed

Answer 11

A measurement in m/s of the body’s movement per unit of time with o reference to direction

Question 12

How is speed calculated.

Answer 12

Speed (m/s) = distance covered (m) ÷ time taken (s).

Question 13

Velocity

Answer 13

Measured in m/s and is the rate of change of displacement

Question 14

How is velocity calculated

Answer 14

Velocity (m/s) = displacement (m) ÷ time taken (s)

Question 15

What does the distance time graph look like for a stationary performer

Question 16

What does the distance time graph look like for a performer constant rate but distance is changing

Answer 16

/

Question 17

What does the distance time graph look like for a performer who is decelerating

Answer 17

curve

___________
/
/

Question 18

What does the distance time graph look like for a performer who is accelerating

Answer 18

curve

             /
           / ----------

Question 19

How to calculate gradient of graph

Answer 19

changes in the y / changes in the x

Question 20

What does the velocity time graph look like for a performer travelling at constant velocity

Question 21

What does the velocity time graph look like for a performer travelling at increased velocity (acceleration)

Answer 21

curve

             /
           / ----------

Question 22

What does the velocity time graph look like for a performer travelling at decreased velocity (deceleration)

Answer 22

curve

___________
/
/

Question 23

If the velocity time graph goes in to the negative x and y axis what does that mean the performer is doing

Answer 23

Change in direction

Question 24

Acceleration

Answer 24

Measured in /s2 and is the rate of change of velocity

Question 25

How to calculate acceleration

Answer 25

Change in velocity (m/s) / Time (s)

Question 26

How to calculate the change in velocity

Answer 26

(Final velocity - Initial velocity) / Time

Question 27

How to calculate momentum

Answer 27

Momentum (kgm/s) = mass (kg) X velocity (m/s)

Question 28

External force

Answer 28

Force that comes from outside the body

Question 29

Example of an external force

Answer 29

Friction, air resistance and weight.

Question 30

Internal force

Answer 30

Force generated by the contraction of skeletal muscles

Question 31

Example of an internal force

Answer 31

The force generated as the quads contract concentrically to extend the knee in a jump

Question 32

Give the two vertical forces.

Answer 32

Weight and reaction force

Question 33

When does a reaction force occur.

Answer 33

When two bodies are in contact with one another.

Question 34

Give the two horizontal forces.

Answer 34

Friction and air resistance.

Question 35

Friction

Answer 35

Occurs when 2 or more bodies are in contact with one aother

Question 36

What are the two types of frictional force

Answer 36

Static and sliding

Question 37

What 3 factors can affect friction

Answer 37

1) Surface characteristics of the 2 bodys 2) Temperature of the 2 surfaces 3) Mass of objects

Question 38

Air resistance

Answer 38

A force that acts in the opposite direction to the motion of a bod travelling through the air

Question 39

What does air resistance depend on

Answer 39

- Velocity of moving body - Cross sectional area of moving body - The shape and surface characteristics of a moving body

Question 40

Drag

Question 41

Net force

Answer 41

This is the resultant force acting on a body when all other forces have been considered

Question 42

How to calculate impulse

Answer 42

Impulse = Force x Time

Question 43

Net impulse

Answer 43

A combination of positive and negative impulses