Reducing friction: practical | Science | Quizalize & Oak National Academy

Starter quiz

An object is set sliding across a surface. The greater the friction, the ______ the distance the object will slide, before it stops.
- 'shorter' ✓
For an experiment to be a fair test, how many things can be changed between each test?
- For a fair test, nothing can be changed between each test.
- For a fair test, only one thing can be changed between each test. ✓
- For a fair test, only two things can be changed between each test.
How do scientists check for mistakes in their results during the experiment?
- They always have another scientist watching the experiment too.
- They do repeat measurements. ✓
- They set up their equipment really carefully.
A scientist slides a mass across a desk four times, in the same way each time. The distances travelled by the mass each time were 34, 37, 55 and 35 cm. Which result is probably a mistake?
- 34 cm
- 37 cm
- 55 cm ✓
- 35 cm
Which of the following statements are examples of lubricants (substances added to reduce friction)?
- Oil on a bike chain ✓
- Grease in an engine ✓
- Water in a water slide ✓
- Paint on wooden floorboards
A scientist slides a mass across a desk four times, in the same way each time. The distances travelled by the mass each time were 54, 57, 54, and 55 cm. What should be used as the final result?
- The lowest result (54 cm).
- The highest result (57 cm).
- The most common result (54 cm).
- The mean (average) result (55 cm). ✓

A lubricant is a substance added to a surface to reduce the ...
- 'friction' ✓
What is an anomalous result?
- A result that just feels wrong.
- A result that doesn't fit with other results. ✓
- A result that is very similar to other results.
A scientist slides a mass across a desk three times, in the same way each time. The distances travelled by the mass were 20, 24 and 25 cm. Calculate the mean result. Mean result = ______ cm.
- '23' ✓
A scientist slides a mass across a desk four times, in the same way each time, to check for mistakes. The distances travelled by the mass were 22, 19, 23, and 46 cm. Which result is anomalous?
- 22 cm
- 19 cm
- 23 cm
- 46 cm ✓
Which is the correct reason why, in a fair test, the only thing we change is the variable we are testing, and everything we are not testing has to be kept the same?
- So we can do repeat results.
- So we can identify anomalous results.
- So we can be sure that different results are caused by the one thing we changed. ✓
A scientist slides a mass across a desk four times, in the same way each time. The distances travelled by the mass were 70, 73, 34 and 69 cm. Calculate the mean result. Mean result = ______ cm.
- '71' ✓

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Lubricants are substances added between two surfaces to reduce the friction between them.
In a fair test, only the variable we are testing is changed.
In a fair test, everything we are not testing is kept the same for every measurement.
Repeat measurements help check for anomalous results.
A mean combines repeat measurements into a single result.

Friction is only between solids that are rubbing together.

Highlight the different amounts of friction between the solids that are separated by different liquids.

Lubricant - Lubricants are substances added between two surfaces to reduce the friction between them.
Fair test - In a fair test, only the variable being tested is changed, so any differences in results can only be due to that variable.
Anomalous result - Anomalous results are ones that do not fit the pattern we see for other measurements.
Repeat measurement - A repeat measurement is when you make a measurement again to check the result.
Mean - A mean combines repeat measurements into a single result.