Name: ________________________________________
Date ______________
Grade: 7
Subject: Physics
1.
Revision Sheet
The diagram below shows an archer about to shoot an arrow. The path that
the arrow will follow is shown as a dotted line.
a)
What type of energy is stored in the bow when the archer pulls the
bowstring towards her?
……………………………………………………………………………………
b)
What type of energy does the arrow gain when the bowstring is
released?
………………………………………………………………………………………
c)
What happens to this energy as the arrow goes higher?
………………………………………………………………………………………
d)
What energy does the arrow possess when it has reached the
position X shown on the diagram?
……………………………………………………………………………………
e)
What happens to this energy as the arrow falls to the ground?
……………………………………………………………………………………
2.
Fossil fuels are often used to generate electricity.
a)
What type of energy do these fuels contain?
……………………………………………………………………………………
b)
What is the initial source of the energy?
…………………………………………………………………………………
3.
The diagram below shows some of the energy conversions that take place
in a runner. Complete the diagram.
output energy
input energy
40 J heat energy
500 J chemical energy
+
................................. J
........................ energy
4.
Which of these statements about energy are true?
Tick (√) two boxes.
Energy can be created.
In any energy change some energy is given out as heat.
Energy is always conserved.
Energy can be destroyed.
5.
Electrostatics can be useful.
The picture shows a person dusting.
a)
Use your knowledge of electrostatics to complete these sentences.
The
duster
is
……………………The
………………………………
charge
so
dust
has
it
is
……………………………… to the duster.
b)
Electrostatics can be a problem.
Give one example.
……………………………………………………………………………………
6.
The circuit below shows four ammeters connected in a parallel circuit with
two identical lamps.
A current of 3 amps is flowing through the circuit.
If ammeter A1 is reading 3 A, what will ammeters A2, A3 and A4 read?
A2: …………………………………
A3: …………………………………
A4: …………………………………
7. Clay objects made in the shapes shown in the picture were each dropped
down a long tube of water to see how fast they fell.
a)
Which shape fell fastest and why?
……………………………………………………………………………………
……………………………………………………………………………………
8.
When a skydiver pulls on the ripcord of his backpack a small pilot parachute
is released. It is connected to the main parachute by a cord and a moment
later the main parachute is released.
a)
Name force A and force B on the diagram.
Force A is
Force B is
b)
Some students investigate how the size of the parachute affects how
fast he falls. They talk about their ideas.
i)
Which two ideas are about using a fair test?
………………………………..…………and
………..………………………………..
ii)
Which idea is a prediction?
……………………………………………………………………………………
iii)
Suggest one reason why the students need to make models.
………………………………………………………………………………….........
9.
The diagram below shows a simple circuit.
a)
Which bulbs will light up when only Switch 1 is closed?
…………………………………………………………………………………..
b)
Which bulbs will light up when only Switch 2 is closed?
……………………………………………………………………………………
10.
The diagram shows the symbol of a voltmeter and a simple circuit.
On the diagram above, draw how you would connect the voltmeter to the
circuit to measure the voltage across the lamp.
11.
The diagram below shows a circuit.
What are the names of the components labelled in the circuit diagram
above?
X…………………………………..
Y…………………………………..
Z…………………………………..
12.
Pete’s teacher gave him an electrical ‘black box’ to investigate. Pete
connected the black box to a cell. He included an ammeter in the circuit to
measure the current flowing through the black box.
Pete added more cells, and recorded the current each time. The table
shows his results:
Number of cells
a)
i)
Current flowing, in amps
1
0.40
2
0.80
3
1.40
4
1.60
When the teacher looked at Pete’s results, she suggested
that he might have made a mistake with one of them. Which
one?
………………………………………………………………………………………
ii)
Give a reason why you chose this one?
………………………………………………………………………………………
b)
On the graph provided below, plot Pete’s results.
Draw a line through his correct results.
c)
Use your graph to make a prediction:
What current would flow if the black box was connected to 5 cells?
………………………………………………………………………………………….