Speed

Question 1

How do you work out distance?

Answer 1

Speed X Time = Distance

Question 2

How do you work out speed?

Answer 2

Distance / Time = Speed

/ = divided by

Question 3

How do you work out time?

Answer 3

Distances / Speed = Time

/ = divided by

Question 4

What is speed?

Answer 4

Speed is a way of saying how fast or slow something is moving

Question 5

If the units for distance are meters and the units for time is seconds, what is the units for speed?

Answer 5

The units for speed will be meters per seconds (m/s)

Question 6

How do you work out the speed?

Answer 6

Speed = distance / time

Question 7

If the gradient line is steep, what does this mean for the speed of a car?

Answer 7

The steeper the gradient line the faster the car

Question 8

How do you work out the gradient?

Answer 8

To work out the gradient you first work out how many seconds there are per box in the chart

Question 9

When an object falls through the air what two forces does it experience?

Answer 9

When an object falls through the air it experiences two forces, weight and air resistance

Question 10

As an object falls initially how does the weight relate to the air resistance?

Answer 10

As an object falls initially the weight is much greater than the air resistance

Question 11

What happens to an object as it falls to make it stop accelerating?

Answer 11

As the object speeds up the air resistance gets bigger until the two forces are equal. At this time, the forces are balanced and the object stops accelerating.

Question 12

What is the speed triangle?

Answer 12

/ \
  / D \
 \_\_\_\_\_
/S x T\
------

Question 13

On a speed time graph what is the area under the graph?

Answer 13

On a speed time graph the area under the graph = distance

Question 14

If a speed time graph has a positive correlation what does it show the vehicle is doing

Answer 14

It shows the vehicle is accelerating

Question 15

If the speed time graph has a gradient of 0 {flat} what does it mean the vehicle is doing?

Answer 15

It shows the vehicle is stationary or at a constant speed

Question 16

If the speed time graph has a negative correlation what does this mean for the vehicle?

Answer 16

It means the vehicle has a negative correlation

Question 17

What is terminal velocity?

Answer 17

Terminal velocity means the object can’t go /fall/ any faster

Question 18

What is the mean speed?

Answer 18

Mean speed is the average speed the object travels at across the entire distance

Question 19

What is a wind tunnel?

Answer 19

A wind tunnel is when you send a stream of smoke over a car and see the line that it takes to see how much resistance there is

Question 20

If there is a lot of air {force} hitting an object, how does it effect the speed of the object and why?

Answer 20

The amount of air {force} hitting the object, the higher the area of the object must be, so the higher the pressure, meaning the slower he object goes

Question 21

What is turbulence?

Answer 21

Turbulence is the disturbance in the pattern of air

Question 22

If an object has high resistance and is slow then what happens to the turbulence?

Answer 22

This means the turbulence is higher

Question 23

Give four examples of streamlined objects

Answer 23

Rugby balls
Bullets
Knives {throwing}
Swords
Darts
Coats

Question 24

Why do we streamline objects?

Answer 24

We streamline objects to reach maximum speed with minimum effort

Question 25

What is air resistance caused by?

Answer 25

Air resistance is caused by force across an area

Question 26

How does speed affect air resistance?

Answer 26

^ Speed Increase in speed means
^ distance / time an increase in distance over time means
^ air particles collide more air particles collide, meaning
^ FoRcE a higher force
^ area {which is higher if the area is higher}
^ pressure meaning more pressure, also meaning
^air pressure there is higher air resistance

Question 27

What causes resistance?

Answer 27

Collision with particles causes resistance