P4 Science · Chapter 13brightbit.net/worksheets
Forces — Gravitational Force
Name: ______________________Class: ________Date: ____________Score: ____ / 10
- 1.
What is gravitational force?
(a) The force that keeps magnets together(b) The force of attraction between objects due to their mass(c) The force that allows objects to float in water(d) The force produced by a stretched elastic band
- 2.
What is the difference between mass and weight?
(a) Mass is measured in newtons; weight is measured in kilograms(b) Mass is the amount of matter in an object; weight is the gravitational force acting on that mass(c) Mass changes with location; weight stays the same(d) Mass and weight are the same thing
- 3.
An astronaut has a mass of 70 kg on Earth. What is her mass on the Moon?
(a) About 12 kg(b) 70 kg(c) About 420 kg(d) 0 kg
- 4.
A student drops a heavy book and a light pen from the same height at the same time in a vacuum (no air). Which hits the ground first?
(a) The heavy book(b) The light pen(c) They hit the ground at the same time(d) It depends on their shape
- 5.
The unit of force is the ___.
(a) Kilogram (kg)(b) Newton (N)(c) Metre (m)(d) Joule (J)
- 6.
Why do astronauts feel "weightless" on the International Space Station (ISS)?
(a) There is no gravity in space(b) The ISS is too far from Earth for gravity to act(c) The ISS and everything in it are in free fall towards Earth, so there is no normal force felt(d) Astronauts lose their mass in space
- 7.
What instrument is used to measure the weight (gravitational force) of an object?
(a) Ruler(b) Thermometer(c) Spring balance (force meter)(d) Measuring cylinder
- 8.
On the Moon, the gravitational field strength is about 1/6 that of Earth. If an object weighs 60 N on Earth, what would it weigh on the Moon?
(a) 60 N(b) 360 N(c) 10 N(d) 6 N
- 9.
State the direction in which gravitational force acts on objects near the Earth's surface.
- 10.
A student on Earth has a mass of 50 kg. Her weight on Earth is 500 N. Explain the difference between her mass and her weight.
Answer key — P4 Science: Forces — Gravitational Force
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- 1.(b) The force of attraction between objects due to their mass
- 2.(b) Mass is the amount of matter in an object; weight is the gravitational force acting on that mass
- 3.(b) 70 kg
- 4.(c) They hit the ground at the same time
- 5.(b) Newton (N)
- 6.(c) The ISS and everything in it are in free fall towards Earth, so there is no normal force felt
- 7.(c) Spring balance (force meter)
- 8.(c) 10 N
- 9.downwards towards the centre of the Earth
- 10.mass is the amount of matter in her body (50 kg) and does not change; weight is the gravitational force pulling her towards Earth (500 N) which would change on different planets
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