quiz unit 7
TRANSCRIPT
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UNIT 7 Quiz:
check your
learning
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Page 81, exercise 3. Finish the sentence.
1. Contact forces require …
2. A contact force can be a push force or …
3. Contact forces can be applied by people, animals and…
4. Kicking a ball is an example of a contact force causing…
5. To lift a car you need a machine called …
6. A footballer applies contact forces to the ball using his…
7. A contact force applied to plasticine changes its …
8. A medium contact force applied to an egg causes it to…
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Page 83, exercise 4. Answer true or false.
1. Magnets create magnetic forces.
2. Magnetic forces are contact forces.
3. Magnetite is a mineral that is a natural magnet.
4. Both ends of a magnet are exactly the same.
5. Magnets attract all metal objects.
6. Magnets attract or repel each other.
7. The north pole of a magnet and the south pole of another
magnet repel each other.
8. The south poles of 2 magnets repel each other.
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Page 85, exercise 4. Answer the questions.
1. Is gravity a contact force or a non-contact force?
2. On the Earth, does gravity pull objects towards its centre or towards
space?
3. Which has a bigger mass: the Earth or the Moon?
4. Which has more gravity: the Moon or the Earth?
5. Where can you jump higher: on the Earth or on the Moon?
6. Where does a sack of potatoes feel heavier: on the Earth or on the
Moon?
7. Where is there least gravity: on the Earth, on the Moon or in space?
8. Why do apples fall off trees: because of gravity or magnetic forces?
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ANSWERS
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Page 81, exercise 3. Finish the sentence.
1. Contact forces require … (touch).
2. A contact force can be a push force or … (a pull force).
3. Contact forces can be applied by people, animals and…(machines).
4. Kicking a ball is an example of a contact force causing…(movement).
5. To lift a car you need a machine called … (a crane).
6. A footballer applies contact forces to the ball using his…(feet and
head).
7. A contact force applied to plasticine changes its …(shape).
8. A medium contact force applied to an egg causes it to…(break).
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Page 83, exercise 4. Answer true or false.
1. Magnets create magnetic forces. (True.)
2. Magnetic forces are contact forces. (False.)
3. Magnetite is a mineral that is a natural magnet. (True.)
4. Both ends of a magnet are exactly the same. (False.)
5. Magnets attract all metal objects. (False.)
6. Magnets attract or repel each other. (True.)
7. The north pole of a magnet and the south pole of another
magnet repel each other. (False.)
8. The south poles of 2 magnets repel each other. (True.)
![Page 8: Quiz unit 7](https://reader036.vdocuments.net/reader036/viewer/2022082408/558a499cd8b42a285c8b4619/html5/thumbnails/8.jpg)
Page 85, exercise 4. Answer the questions.
1. Is gravity a contact force or a non-contact force? (A non-contact force.)
2. On the Earth, does gravity pull objects towards its centre or towards space?
(Towards its centre.)
3. Which has a bigger mass: the Earth or the Moon? (The Earth.)
4. Which has more gravity: the Moon or the Earth? (The Earth.)
5. Where can you jump higher: on the Earth or on the Moon? (On the Moon.)
6. Where does a sack of potatoes feel heavier: on the Earth or on the Moon? (On
the Earth.)
7. Where is there least gravity: on the Earth, on the Moon or in space? (In space.)
8. Why do apples fall off trees: because of gravity or magnetic forces? (Gravity.)