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Friction OALH

Last updated almost 5 years ago
29 questions
Do Now
1

After being stretched, springs return to their original shape because they are…

1

Which law states that the extension of a spring is proportional to the weight attached to it?

1

State the pH of an alkali

1

Which technique could be used to separate the different coloured chemicals in a sample of ink?

1

Put the following numbers in order from smallest to largest: 5, 6, 2, -2, -5

1

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
1

Friction is a…

1

Friction always acts in the…

1

Lubricants are used to…

1

Lubricants work by…

Key Knowledge
1

What type of force is friction?

1

State where friction acts

1

State which direction friction acts

1

How can we reduce friction?

1

Which has more friction a rough surface of a smooth surface

Quick Quiz
1

To reduce friction we use………

1

Friction always acts ……..

1

Friction is an example of a …………

1

Salt is put on icy roads to help melt the ice. Explain why else we might add salt to icy roads.

You do
1

I think that the cyclist is trying to_______ the amount of friction on his bike chain by adding oil (a lubricant) because…

1

State whether the friction between the skater and the ice is high or low. Explain how you know.

1

Explain how the soles of trainers are designed to increase friction between the shoe and the ground.

1

Suggest what might happen if you tried to walk in shoes which didn’t have a special pattern on the soles.

1

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
1

Draw one arrow on the diagram to show the direction of the force which prevents the wagon from moving.

1

Is the force which prevents the wagon from moving greater than, equal to or less than the pull of the engine?

1

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?

1

The pull of the engine is 5000 N. When the wagon’s speed is increasing, how large is the frictional force?

1

After a while, the wagon travels at a steady speed. The engine is still pulling with a force of 5000 N.
How large is the frictional force now?