Physics Yr 11 Revision Qs
Physics Yr 11 Revision Qs
Physics Yr 11 Revision Qs
1.
Name__________________________
The diagram shows the horizontal forces acting on a cyclist while she is accelerating.
(a)
Explain how the unbalanced force acting on the cyclist changes as she accelerates and
then cycles at a constant speed.
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(3)
(b)
Some racing cycles have lightweight frames. Why is it an advantage for the cycle to have
a lightweight frame?
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(2)
(c)
(i)
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(3)
(ii)
The kinetic energy of the cyclist and cycle increases at an average rate of
180 joules per second.
Calculate the time it takes to gain this energy.
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(2)
(d)
The diagram shows the energy flow through the cycle during the first second that the cyclist
is accelerating.
200 J
f ro m c y c lis t
(i)
180 J
a s k in e tic e n e rg y
(ii)
(iii)
When the cyclist is travelling at constant speed, the kinetic energy is constant
although the cyclist is still producing 200 J/s.
Where does the energy go?
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(1)
(Total 15 marks)
2.
A sky-diver of mass 70 kg jumps from a plane. The graph shows how the vertical velocity of the
sky-diver varies with time. Parts of the graph have been labelled A, B, C, D and E.
50
40
V e rtic a l v e lo c ity 3 0
in m /s
20
10
A
0
0
(a)
E
5
10
15
20
25
30
T im e in s
35
40
45
50
(b)
How can you tell from the graph that in the time period from B to C the resultant force
acting on the sky-diver is zero?
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(2)
(c)
Describe and explain the motion of the sky-diver from C until he lands at E.
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(4)
(d)
A sky-diver, of the same mass, falls from the same height but uses a parachute with a
larger surface area. On the grid, sketch a graph to show his motion.
(2)
(Total 11 marks)
3.
N o t to
s c a le
45 m
(i)
In the diagram, Paul has more gravitational potential energy than Kate.
Explain why.
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(1)
(ii)
Give the equation needed to calculate how much work Kate will do in climbing
the rock face.
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(1)
(iii)
(iv)
(v)
(b)
(2)
(Total 10 marks)
4.
The diagram shows the forces on a car travelling along a level road.
re s is tiv e fo rc e = 5 5 0 N
d riv in g fo rc e = 9 5 0 N
(a)
(b)
(c)
Explain how the horizontal forces on the car change when the driver takes her foot off the
accelerator and applies the brake.
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(3)
(Total 7 marks)
5.
(a)
Explain the difference between kinetic energy and gravitational potential energy.
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(2)
(b)
(i)
Calculate the increase in the gravitational potential energy of the bricks. The
gravitational field strength is 10 N/kg.
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(3)
(ii)
6.
A pest control device emits sound at frequencies between 50 kHz and 70 kHz.
The device is shown in the diagram.
P e s t C o n tro l
TM
H A RM LESS TO C ATS,
D O G S & PEO PLE
B U T R A T S - M IC E A N D
A N T S C A N 'T S T A N D I T
G U ARAN TEED
to rid a n y b u ild in g
o f R a ts , M ic e , A n ts
a n d S p id e rs
(a)
(b)
7.
The diagram shows the wave fronts of a beam of light as it passes from air into glass.
a ir
g la s s
g la s s
a ir
(a)
(b)
The diagram shows light rays from a divers waterproof torch hitting the surface of a lake.
a ir
w a te r
w a te rp ro o f to r c h
8.
(a)
B
A
D
(i)
D is ta n c e
(ii)
(b)
km/s
Hz
W
(1)
(c)
When the wave reaches the cork, the cork bobs up and down but does not move nearer to
the side of the pond.
(i)
(ii)
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9.
(i)
microwaves
infra-red
visible light
ultraviolet
(ii)
(b)
(i)
(ii)
(iii)
(c)
Ionising radiations can cause cell damage and cancer in our bodies. The only ionising
radiation in the table is ultraviolet.
Mobile phones use microwaves which are not ionising.
(i)
Is this enough information to say that mobile phones are safe to use?
Explain your answer.
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(3)
(ii)
Many different people are very interested in the research into mobile phone safety.
They may find information in scientific publications.
(1)
(2)
10.
(a)
A current of 0.02 A could give a serious electrical shock to a person. If the resistance of a
body is 10 000 ohms, calculate the voltage which will cause this current.
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(3)
(b)
(c)
Some appliances have an earth wire fitted to them to prevent the user receiving an electric
shock.
(i)
(ii)
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(d)
(i)
Explain how the earth wire prevents a person receiving an electric shock when the
live wire comes into contact with the metal casing of an appliance.
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(2)
(ii)
Why must the resistance of the earth wire to an appliance be very low?
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(2)
(Total 12 marks)
11.
(a)
Some Christmas tree lights are connected in series. A typical arrangement consists of
twenty lamps connected to the power supply.
(i)
If the filament in one of the lamps breaks, all the other lamps go out.
Why is this?
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(1)
(ii)
How does the brightness of the lamps change if another five similar lamps are
connected in series?
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(1)
(iii)
Why does the brightness change in the way you have described in part (ii)?
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(1)
(b)
Some Christmas tree lights use lamps which have a resistor placed across the filament.
This is shown in the diagram.
13
fila m e n t
r e s is to r ( R )
(i)
In this case when a filament breaks the other lamps in the series circuit remain on.
Why is this?
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(1)
(ii)
In a different set of lights, the value of the resistor (R) is much bigger than the
resistance of the lamp filament. Explain what happens to the other lamps in this
series circuit when one lamp filament breaks.
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(2)
(Total 6 marks)
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