Required practical

Question 1

method

Answer 1

1. release a trolley and use a stopwatch to take measurements needed to calculate acceleration
2. move 100g (1N) from the trolley onto the mass holder
3. repeat the steps until all the masses have been moved from the trolley onto the mass holder

if investigating the mass, keep the force constant by removing a mass from the trolley but not adding it to the holder

Question 2

consideration, mistakes errors

Answer 2

when changing the force, keep the mass of the system constant. masses are taken from the trolley to the holder. no extra masses are added

Question 3

hazards/risks

Answer 3

experiment is masses falling onto the person’s feet to so minimise this, masses should be kept to the minimum needed for a good range of results

Question 4

what is the independent variable

Answer 4

force/ mass

Question 5

what is the control variable

Answer 5

• force if the mass is changed
• mass if the force is changed

Question 6

why is it important to carry out repeat reading during an experiment

Answer 6

to identity anomalous results which can then be removed and allow a mean to b taken
-calculating a mean reduces random errors so its accurate to the true value