Answer all questions in your homework book – Submit work on Monday 20th May, 2024
1. What are the units of a mass, b force and c acceleration?
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2. A book is weighed on Earth. It is found to have a mass of 1kg. So, its weight on the Earth is 10 N.
What can you say about its mass and its weight if you take it:
a. To the Moon, where gravity is weaker than on Earth?
b. To Jupiter, where gravity is stronger?
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3. An astronaut has a mass of 90kg.
a. Calculate her weight on the surface of the earth.
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b. The astronaut travels to Mars, where gravity is weaker. The acceleration of free fall on the
surface of Mars has a value g = 3.7 m/s2.
Calculate her weight on Mars.
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4. An Airbus A380 aircraft has four jet engines, each capable of providing 320 000 N of thrust.
The mass of the aircraft is 560 000 kg when loaded.
What is the greatest acceleration that the aircraft can achieve?
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5. When you strike a tennis ball that another player has hit towards you, you provide a large force
to reverse its direction of travel and send it back towards your opponent. You give the ball a
large acceleration.
What force is needed to give a ball of mass 0.10 kg and acceleration of 500 m/s2?
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6. (a) Why is it sensible on diagrams to represent a force by an arrow?
(b) Why should mass not be represented by an arrow?
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7. Which will produce a bigger acceleration: a force of 10.0 N acting on a mass of 5.0 kg, or a force
of 5.0 N acting on a mass of 10.0 kg?
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8. An astronaut is weighted before he sets off to the Moon. He has a mass of 80 kg.
(a) What will his weight be on Earth?
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(b) When he arrives on the Moon, will his mass be more, less or the same? Explain your answer.
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(c) Will his weight be more, less or the same? Explain your answer.
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9. The diagram shows the forces acting on a lorry as it travels along a flat road.
(a) Two of the forces have effects that cancel each other out. Which two? Explain you answer.
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(b) What is the resultant force acting on the lorry? Give its magnitude and direction.
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(c) What effect will this resultant force have on the speed at which the lorry is travelling? [1]
10. The gravitational field of the Moon is weaker than that of the Earth. It pulls on each kilogram of
mass with a force of 1.6 N. What will be the weight of a 50 kg mass on the Moon?
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