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WorksheetsFinal gr8 Physics
Total questions: 20
Worksheet time: 59mins
A railway truck with a mass of 6,000 kg rolling at 4 m/s collides with a stationary truck of mass 10,000 kg. The trucks join together. At what speed do they move after the collision?
1 m/s
1.5 m/s
15 m/s
2m/s
Work out, giving your answers in kg m/s, the momentum of a tennis ball of mass 60 g travelling at 180 km/h.
10,800 kg m/s
3 kg m/s
216 kg m/s
1.2 kg m/s
A bookshelf is 2 m long, with supports at its ends (P and Q). (Do not consider the weight of the bookshelf when you are answering this question)A book weighing 40 N is moved so that it is 50 cm from Q. Use moments to calculate the forces at P and Q.
F (P)=20N, F(Q)=20N
F (P)=10N, F(Q)=30N
F (P)=30N, F(Q)=10N
F (P)=25N, F(Q)=15N
If the drum is hit more gently.......... energy is transferred and sound waves with a ........... amplitude are produced. We hear these as quieter sounds.
less ,smaller
more ,bigger
less , bigger
more, smaller
A 60 W tungsten filament bulb uses 60 J of energy every second. It is 5% efficient. How much of the total energy output per second is useful light energy?
5 J
65 J
3 J
55 J
How much work is done in the following situation?
A rocket with a thrust of 100 kN travels to a height of 200 m.
20 MJ
20,000 MJ
2MJ
20,000KJ
Look at the diagram below. It shows various forces acting on objects about pivots. Which diagram shows the greatest turning moment about the pivot?
A
B
C
D
What is the unit of force?
Meter
Newton
Newton meter
Centimeter
Moment is a measure of the turning effect of a force.
True
False
Principle of moments states that an object is balanced when clockwise moments are equal to anticlockwise moments.
True
False
What is the moment acting on the left side of the pivot?
2 Nm
20 Nm
200 Nm
0.2 Nm
James weighs 200 N and sits 1 m from the pivot. Jane weighs 100 N. How far from the pivot must Jane be to balance the beam?
0.5 m
1 m
2 m
4 m
Work out the kinetic energy of a ball of mass 60 g travelling at 24 m/s.
1.44 J
0.72 J
34.65 J
17.28 J
If a lift and passengers have a combined weight of 5,000 N and the lift moves upwards with an average speed of 7 m/s then what is the useful power output of the lift motor?
35,000 W
35,000 J
714.286 W
0.0014 J
...............is the rate of transfer of energy or the rate of doing work.
Work
Momentum
Moment
Power
Calculate the wavelength of a sound wave that is produced by a source vibrating with a frequency of 170 Hz. The speed of sound in air is 340 m/s.
0.5 m
2 m
4 m
170 m
A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of thermal energy. How efficient is the kettle?
100%
7%
93%
95%
The figure shows a Sankey diagram for a complex system - the energy flow for a car. Which of the following energy stores is useful?
Chemical energy in the form of petrol is the input to the car.
Electrical energy (from the alternator) to drive lights, radio
Movement (kinetic) energy from the car engine
Wasted energy as electrical heating in wiring and lamp filaments, as frictional heating in various parts of the engine and alternator, and as noise.
...............is the ability to do work.
Audible Range
GPE
Energy
Momentum
