P2.3 & P2.4 Motions And Forces And Momentum, Energy, Work And Power Flashcards Preview

Physics 2 > P2.3 & P2.4 Motions And Forces And Momentum, Energy, Work And Power > Flashcards

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

What is the effect of a tired driver on stopping distance?

It increases