Flashcards in P2.3 & P2.4 Motions And Forces And Momentum, Energy, Work And Power Deck (33):

1

## A runner runs a 400m race on a track. What is his distance and displacement?

###
Distance: 400m

Displacement: 0m

2

## On a distance-time graph, what does the gradient of the line show?

### Speed

3

## How do you calculate speed?

### Distance(m) / time taken(s)

4

## How do you calculate acceleration?

### Change in velocity / time taken

5

## What are the units for acceleration?

### m/s2

6

##
Which of these values is not acceleration?

-2.3m/s2

100000000m/s2

1.5m/s2

### All of them are acceleration

7

## On a velocity-time graph, what does a straight line show?

### Constant velocity

8

## What is a vector quantity?

### A quantity which has size and direction

9

## What forces can act on an object moving in the air?

###
Drag

Thrust

Upthrust

Weight

10

## When are forces balanced?

### When the two forces acting against each other are the same

11

## What factors affect acceleration?

###
Mass

Force

Friction

12

##
What is the formula for force?

### Mass*acceleration

13

## What are the units for force?

### Newtons, N

14

## What is terminal velocity?

### The velocity an object reaches when it falls when it cannot accelerate any further

15

## What are the units for gravitational field strength?

### Newtons per kilogram, N/Kg

16

## What is the formula for weight?

###
Mass*gravitational field strength

W=m*g

17

## What is thinking distance?

### The distance that a car moves in the time that it takes a driver to react

18

## What is braking distance?

### The distance a car travels between the driver braking and it stopping

19

## What is stopping distance?

### Thinking distance*Braking distance

20

## What factors affect thinking distance?

###
State of the driver eg

Alcohol

Caffeine

Drugs

Illness

21

## What factors affect braking distance?

###
Road condition

Tyre condition

Velocity

Mass

22

## What is the formula for momentum?

###
Mass*velocity

Kg m/s = Kg*m/s

23

## What are crumple zones on a car?

### Crumple zones are parts of the front on a car that can crumple on impact, which absorbs some of the energy in a crash

24

## What is the formula for force relating to momentum?

###
Force = Change in momentum / time taken

F= mv-mu / t

N= kgm/s / s

25

## What is the formula for work done?

###
Work done = force * distance moved

E= F*d

J= N*m

26

## What is the formula for power?

###
Power = work done / time taken

P = E / t

W= J / s

27

## What is the formula for Gravitational potential energy?

###
GPE = mass * GFS * vertical height

GPE= m * g * h

J = kg* N/kg * m

28

## What is the formula for kinetic energy?

###
KE = 1/2 * mass * velocity2

KE = 1/2 * m * v2

J= 1/2 * kg * m/s2

29

## What Is conservation of energy?

### The GPE is the same as KE when it is transferred

30

## How can you calculate distance from a velocity-time graph?

### Velocity * time on the area underneath the line on the graph

31

## Why can a space probe travel without fuel?

### There is no air in space to slow it down

32

## What is negative acceleration?

### Slowing down

33