KS3 Science Quiz - Forces 01 (Questions)
This KS3 Science quiz asks questions on forces. It doesn't matter if something is moving or stationary,
there are always forces acting on it. Forces are measured in newtons which have the symbol N. One of
the most famous of Newton's laws is that if an object isn't moving, the forces acting on it are equal and
opposite.
The force a book puts on a shelf is its weight. Weight is therefore measured in newtons. Unfortunately,
in everyday life, you will hear most people referring to weight using kilograms. This is entirely incorrect,
kilograms are a measure of mass. Weight is the force created by the attraction of gravity on the mass of
an object. On Earth, a mass of 100g (0.1kg) has a weight of about 1N.
1. What is force measured in?
[ ] Joules
[ ] Kilograms
[ ] Newtons
[ ] Pascals
2. Which of the following is NOT a force?
[ ] Gravity
[ ] Mass
[ ] Pull
[ ] Weight
3. Friction .......
[ ] doesn't affect a moving object
[ ] slows a moving object
[ ] speeds up a moving object
[ ] starts an object moving
4. What is weight measured in?
[ ] Joules
[ ] Kilograms
[ ] Newtons
[ ] Pascals
5. Which of the following statements about unbalanced forces is NOT true?
[ ] They can change the direction of a moving object
[ ] They can slow down an object
[ ] They have no effect on an object
[ ] They speed up an object
6. Which of the following statements about balanced forces is NOT true?
[ ] A moving object will continue to move at constant speed
[ ] A stationary object will not move
[ ] They are the same size acting in the opposite direction
[ ] They are the same size acting in the same direction
7. Which of the following is NOT a touching force?
[ ] A push
[ ] Air resistance
[ ] Friction
[ ] Magnetism
8. On Earth, 1kg weighs approximately 10N. What would be the weight of 500g?
[ ] 1N
[ ] 5N
[ ] 50N
[ ] 500N
9. On Jupiter, 1kg weighs approximately 25 newtons. What would be the weight of 100g?
[ ] 0.25N
[ ] 2.5N
[ ] 250N
[ ] 2500N
10. A spring can be stretched by hanging masses on it. Which of the following is true?
[ ] The larger the force, the greater the stretch
[ ] The smaller the force, the greater the stretch
[ ] The spring does not exert a force on the mass
[ ] The mass does not exert a force on the spring
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KS3 Science Quiz - Forces 01 (Answers)
1.
What is force measured in?
[]
Joules
[]
Kilograms
[x]
Newtons
[]
Pascals
Forces can act in any direction. When drawing forces, you must always show in which direction they are
acting
2.
Which of the following is NOT a force?
[]
Gravity
[x]
Mass
[]
Pull
[]
Weight
Mass is measured in grams, kilograms etc
3.
Friction .......
[]
doesn't affect a moving object
[x]
slows a moving object
[]
speeds up a moving object
[]
starts an object moving
Friction is a force
4.
What is weight measured in?
[]
Joules
[]
Kilograms
[x]
Newtons
[]
Pascals
Weight is a force and therefore should be measured in newtons
5.
Which of the following statements about unbalanced forces is NOT true?
[]
They can change the direction of a moving object
[]
They can slow down an object
[x]
They have no effect on an object
[]
They speed up an object
Unbalanced forces will ALWAYS create movement
6.
Which of the following statements about balanced forces is NOT true?
[]
A moving object will continue to move at constant speed
[]
A stationary object will not move
[]
They are the same size acting in the opposite direction
[x]
They are the same size acting in the same direction
This is Newton's third law of motion
7.
Which of the following is NOT a touching force?
[]
A push
[]
Air resistance
[]
Friction
[x]
Magnetism
Magnets attract or repel at a distance, they do not need to touch the object they are acting on to have
an effect
8.
On Earth, 1kg weighs approximately 10N. What would be the weight of 500g?
[]
1N
[x]
5N
[]
50N
[]
500N
500g = 0.5kg, 0.5kg weighs 0.5 x 10 = 5N
9.
On Jupiter, 1kg weighs approximately 25 newtons. What would be the weight of 100g?
[]
0.25N
[x]
2.5N
[]
250N
[]
2500N
100g = 0.1kg, 0.1kg weighs 0.1 x 25 = 2.5N. The weight of an object depends on the force of gravity that
is acting on it. The Moon has a gravity of about one sixth of that of the Earth, so 1kg would weigh a lot
less than on the Earth, whilst on the planet Jupiter, it would weigh a lot more as the force of gravity
there is larger
10.
A spring can be stretched by hanging masses on it. Which of the following is true?
[x]
The larger the force, the greater the stretch
[]
The smaller the force, the greater the stretch
[]
The spring does not exert a force on the mass
[]
The mass does not exert a force on the spring
According to Newton's third law of motion, if the mass puts a force on the spring, the spring must be
putting a force on the mass
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