Reinforcement Worksheet- Physics
Name of Student: ___________________________________________________________________
Year: 10 Sec: ________
Date: _______________
Answer all the questions:
1. Fig. 1.1 shows an electrically powered bicycle.
When fully charged, the battery can deliver a power of 600W for 60min.
(a) (i) Calculate the energy, in joules, stored in the battery when fully charged.
energy = ...................................................... J [3]
(ii) State the form of energy stored by the battery.
............................................................................................................................................ [1]
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(b) The bicycle has a motor with an electrical input power of 250W.
Calculate the time for which the battery can power the bicycle.
time = ......................................................... [2]
(c) Consider this bicycle compared to a small motorcycle.
State two environmental benefits of the electrically powered bicycle.
1. ................................................................................................................................................
2. ................................................................................................................................................ [2]
2. A student investigates the stretching of a spring.
Fig. 1.1 shows the set-up.
(a) The value l0 is the length of the spring when the load L is 0.0N. The student measures the
length l0 of the spring. She records l0 = 16mm in Table 1.1.
Draw a diagram of the spring to show clearly the length l0 of the spring.
[1]
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(b) The student suspends a load L = 0.20N from the spring. She records the new length l of the
spring in Table 1.1.
She repeats the procedure using loads L = 0.40N, 0.60N, 0.80N and 1.00N. The readings are
shown in Table 1.1.
(i) Calculate the extension e of the spring for each load using the equation e = (l – l0). Record the
values of e in Table 1.1.
[2]
(ii) Complete the column headings in Table 1.1.
[1]
(c) Plot a graph of L (y-axis) against e (x-axis). Draw the best-fit line.
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(d) Use the graph to determine eA, the extension produced by a load of 0.50N. Show clearly on
the graph how you obtained the necessary information.
eA = ......................................................... [3]
3. A train has a total mass of 7.5 × 105 kg.
(a) The train accelerates from rest at a constant rate along a straight, horizontal track. It reaches a
speed of 24 m/s in 60 s. Calculate
(i) the train’s acceleration,
acceleration = .................................................. [2]
(ii) the resultant force acting on the train.
force = .................................................. [2]
(b) The train now travels with a constant speed of 24 m / s along a straight, horizontal track. The
total force opposing the motion due to friction and air resistance is 7.2 × 104 N.
(i) By considering the work done by the train’s engine in 1.0 s, calculate its output power.
power = .................................................. [2]
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(ii) The train begins to travel up a slope. Explain why the power of the train’s engine must be
increased to maintain the speed of 24 m / s.
............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
...................................................................................................................................................... [3]
4. Fig. 2.1 shows a uniform, rectangular slab of concrete ABCD standing upright on the ground.
The slab has height 0.60 m, width 0.30 m and mass 18 kg. A force of 40 N acts horizontally to
the left at B.
(a) (i) Calculate the weight W of the concrete slab.
W = ........................................................ [1]
(ii) The thickness of the slab is 0.040 m. Calculate the pressure exerted by the slab on the
ground.
pressure = ........................................................ [2]
(b) (i) On Fig. 2.1, draw and label an arrow to show the weight W of the slab acting at its centre
of mass.
[1]
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(ii) Calculate
1. the moment of the 40 N force about point D,
moment = ........................................................
2. the moment of W about point D.
moment = ........................................................ [3]
(iii) The ground is rough so that the slab does not slide. State and explain what happens to the
slab as the horizontal force at B is gradually increased.
............................................................................................................................................................
............................................................................................................................................................
............................................................................................................................................................
...................................................................................................................................................... [2]
5. A student is investigating the work required to pull a box containing some masses up a sloping
wooden board. Fig. 4.1 shows the board and the box.
Plan an experiment to investigate how the work required to pull the box up the slope depends on
the mass of the box and its contents.
Work done is calculated using the equation:
work done = force × distance moved in the direction of the force.
The following apparatus is available to the students:
a wooden board
a box with a length of string attached
a selection of masses that fit in the box
a metre rule
an electronic balance.
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In your plan, you should:
• list any other apparatus that you would use
• explain briefly how you would carry out the investigation, including the measurements you
would take
• state the key variables that you would control
• draw a suitable table, with column headings, to show how you would display your readings
(you are not required to enter any readings in the table)
• explain how you would use the results to reach a conclusion.
You may add to the diagram if it helps your explanation.
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