1. Forces: Revision
Thursday, 28 February 2019

2. Question 1
What 3 things can a force change when they act on an object?
Shape, Speed & Direction
30 seconds 00 10 09 08 13 07 12 11 04 01 00 02 03 05 14 06 17 26 25 27 28 30 29 24 23 18 16 19 20 22 21 15

3. Question 2
What is the unit that we use when measuring Force?
Newtons (Named after Isaac Newton)
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4. Question 3
Which of the following is not a contact Force? Friction, Tension, Magnetism, Lift, Upthrust
Magnetism
30 seconds 00 10 09 08 13 07 12 11 04 01 00 02 03 05 14 06 17 26 25 27 28 30 29 24 23 18 16 19 20 22 21 15

5. Question 4
Name one situation where Friction is useful.
Braking, Walking, Heating your hands, etc…
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6. Question 5
What does streamlining mean?
Making an object smoother and smaller to reduce air resistance.
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7. Question 6
What is created, because of friction, when two objects rub against each other?
Heat (and sometimes sound)
30 seconds 00 10 09 08 13 07 12 11 04 01 00 02 03 05 14 06 17 26 25 27 28 30 29 24 23 18 16 19 20 22 21 15

8. Question 7
What is Buoyancy?
The force that acts upwards on an object sitting in a fluid (liquid or gas) (it can make things float).
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9. Question 8
In this picture, what force is represented by A and B?
A Buoyancy B Weight
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10. Question 9
In this picture, if the weight is greater than the buoyancy, what happens to the submarine?
It will sink
30 seconds 00 10 09 08 13 07 12 11 04 01 00 02 03 05 14 06 17 26 25 27 28 30 29 24 23 18 16 19 20 22 21 15

11. Question 10
Is electric (or electro-static) force a contact or non-contact force?
Non-contact
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12. Question 11
What happens if you put two positively charged things together?
They repel each other
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13. Question 12
What is the name of this device?
Van de Graaff Generator 00 09 10 08 07 13 12 11 05 01 00 02 03 14 04 06 17 26 25 27 28 30 29 24 23 18 16 19 20 22 21 15

14. Question 13
Why is the girl’s hair standing up?
A static electric charge is building up in her hair. These equal charges repel each other which makes her hair stand up.
45 seconds 00 14 13 12 11 15 18 19 10 17 16 07 03 02 01 00 04 05 08 20 06 09 22 38 39 37 36 35 40 41 45 44 43 42 34 33 26 25 24 23 27 28 32 31 30 29 21

15. Question 14
What must the girl be standing on? Why?
The girl must be standing on an insulating platform (polystyrene) so that the electric charge does not escape from her to the earth.
45 seconds 00 14 13 12 11 15 18 19 10 17 16 07 03 02 01 00 04 05 08 20 06 09 22 38 39 37 36 35 40 41 45 44 43 42 34 33 26 25 24 23 27 28 32 31 30 29 21

16. Question 15
What 3 metals are magnetic?
Nickel, Cobalt and Iron
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17. Question 16
Why is steel attracted to a magnet?
It contains Iron
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18. Question 17
How do you make an electromagnet?
Wrap a long wire around a piece of Iron then put an electric current through the wire.
45 seconds 00 14 13 12 11 15 18 19 10 17 16 07 03 02 01 00 04 05 08 20 06 09 22 38 39 37 36 35 40 41 45 44 43 42 34 33 26 25 24 23 27 28 32 31 30 29 21

19. Question 18
Name 2 safety features of modern cars.
Seatbelts, Air bags, Crumple zones, etc…
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20. Question 19
What is the difference between your mass and your weight?
Your mass is how much stuff you are made up of. Your weight is the force applied to you by gravity.
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21. Question 20
How do you calculate your weight?
Weight = mass x 10 (on earth)
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22. Question 21
What is meant by the term balanced forces?
Two (or more) forces acting in opposite directions that are the same size.
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23. Question 22
Put these in order starting with the smallest: The Sun, Mercury, Earth, Jupiter, The Moon
The moon, Mercury, Earth, Jupiter, The Sun
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24. Question 23
What is a black hole?
An area of space where gravity is so great that no light can escape.
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