After being stretched, springs return to their original shape because they are…
Question 2
2.
Which law states that the extension of a spring is proportional to the weight attached to it?
Question 3
3.
State the pH of an alkali
Question 4
4.
Which technique could be used to separate the different coloured chemicals in a sample of ink?
Question 5
5.
Put the following numbers in order from smallest to largest: 5, 6, 2, -2, -5
Question 6
6.
If something is falling at terminal velocity it will be travelling at a constant speed. What does that tell us about the forces acting on it?
Checking For Understanding
Question 7
7.
Friction is a…
Question 8
8.
Friction always acts in the…
Question 9
9.
Lubricants are used to…
Question 10
10.
Lubricants work by…
Key Knowledge
Question 11
11.
What type of force is friction?
Question 12
12.
State where friction acts
Question 13
13.
State which direction friction acts
Question 14
14.
How can we reduce friction?
Question 15
15.
Which has more friction a rough surface of a smooth surface
Quick Quiz
Question 16
16.
To reduce friction we use………
Question 17
17.
Friction always acts ……..
Question 18
18.
Friction is an example of a …………
Question 19
19.
Salt is put on icy roads to help melt the ice. Explain why else we might add salt to icy roads.
You do
Question 20
20.
I think that the cyclist is trying to_______ the amount of friction on his bike chain by adding oil (a lubricant) because…
Question 21
21.
State whether the friction between the skater and the ice is high or low. Explain how you know.
Question 22
22.
Explain how the soles of trainers are designed to increase friction between the shoe and the ground.
Question 23
23.
Suggest what might happen if you tried to walk in shoes which didn’t have a special pattern on the soles.
Question 24
24.
You are the manager of Evans Cycles (specialist bike shops). Write a paragraph to explain how you ensure your buyers are safe when cycling.
Plenary
Question 25
25.
Draw one arrow on the diagram to show the direction of the force which prevents the wagon from moving.
Question 26
26.
Is the force which prevents the wagon from moving greater than, equal to or less than the pull of the engine?
Question 27
27.
When the wagon’s brakes are off, the engine pulls the wagon forwards. A frictional force also acts on the wagon. In what direction does the frictional force act?
Question 28
28.
The pull of the engine is 5000 N. When the wagon’s speed is increasing, how large is the frictional force?
Question 29
29.
After a while, the wagon travels at a steady speed. The engine is still pulling with a force of 5000 N.
