Motion and forces

Question 1

describe a scalar quantity

Answer 1

It has a magnitude (size) but no specific direction

Question 2

describe a vector quantity

Answer 2

It has a magnitude (size) and a direction

Question 3

name 5 vector quantities

Answer 3

1. Displacement
2. Velocity
3. Acceleration
4. Momentum
5. Force
   (Lift Drag Thrust Weight)

Question 4

name 5 scalar quantities

Answer 4

1. Length
2. Area
3. Speed
4. Volume
5. Mass
   (Density, Pressure, Temp, Energy, Direction ,Power)

Question 5

define velocity

Answer 5

Speed in a stated direction

Question 6

What is the typical walking speed of a person?

Answer 6

1.5 m/s

Question 7

What is the typical running speed of a person?

Answer 7

3 m/s

Question 8

What is the typical speed of cycling?

Answer 8

6 m/s

Question 9

what the typical speed of sound?

Answer 9

330 m/s

Question 10

what are things that affect the thinking distance?

Answer 10

1. drugs
2. fatigue
3. alcohol

Question 11

What are things that affect the braking distance?

Answer 11

1. weather
2. condition of the road
3. condition of the vehicle

Question 12

What is the gradient on a distance - time graph?

Answer 12

speed

Question 13

What is the gradient on a velocity - time graph?

Answer 13

acceleration

Question 14

How do you find the distance on a velocity - time graph?

Answer 14

find the area

Question 15

What are the steps of carrying out the Light Gate experiment?

Answer 15

1.Set up the light gates a set distance apart
2. make sure that the card on the trolley passes through the light gate

Question 16

What is the acceleration in free fall?

Answer 16

10m/s

Question 17

What is Newton’s First Law?

Answer 17

velocity of an object is stationary unless there is a force acting on it

Question 18

What is Newton’s Second Law?

Answer 18

The idea that the acceleration of an object is directly proportional to he resultant force acting on it

Question 19

What is Newton’s Third Law?

Answer 19

The forces on interacting objects are equal and opposite

Question 20

Collisions : what is the purpose of seatbelts?

Answer 20

To get more time to change momentum.
Smaller rate of change of momentum = lower force

Question 21

what is the stopping distance made up of?

Answer 21

Thinking distance + Braking distance

Question 22

What is the stopping distance affected by?

Answer 22

1.mass of the vehicle
2.speed of the vehicle
3.the driver’s reaction time
4.the state of the vehicle’s brakes
5.the state of the road
6.the amount of friction between the tyre and the road surface

Question 23

what’s circular motion?

Answer 23

an object moving in a circular orbit has a constant speed and a changing velocity as the direction changes

Question 24

what’s the thinking distance?

Answer 24

time taken to react and apply the brake

Question 25

what’s the braking distance?

Answer 25

time taken from brake being applied to reaching a stationary motion

Question 26

what effects the thinking distance?

Answer 26

tiredness
alcohol
drugs
old age
fog

Question 27

why do icy roads effect the braking/stopping distance?

Answer 27

-when the vehicle touches the ice, the tyres slip up and you just drive slower
-driver may not see ice and panic once they feel it