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P5: Quiz 8 – Answers
P5: Quiz 8 – Answers
1) Force = spring constant x extension
f = ke
Force is in newtons (N), spring constant is in newtons per metre (N/m) and extension is in metres (m)
f = ke
Force is in newtons (N), spring constant is in newtons per metre (N/m) and extension is in metres (m)
2)
a) Measure the natural length of the spring (the length when no forces are added) [you can add a bit of tape to the bottom of the spring to make measuring the length a little easier/ more accurate]
Add a force (such as 1 N) and then measure the extension of the spring
Keep adding more forces and measuring the extension of the spring until we have 6 or more values
We can then plot our graph.
b)
i)
ii) 6.5 N (or any value between 6 N and 7 N)
iii) 50 N/m
3) Ee = ½ x k x e2
Ee is the elastic potential energy measured in joules (J), k is the spring constant in newtons per metre (N/m) and e is the extension in metres (m).
4) 0.8 J
5) 1.89 J
6) 15 cm
7) 150 N/m
Questions
1) Write down the equation that links force, extension and spring constant. Give the units for the values as well.
2) A student carries out an experiment to investigate the link between force and extension of a spring. He uses the apparatus shown below.
1) Write down the equation that links force, extension and spring constant. Give the units for the values as well.
2) A student carries out an experiment to investigate the link between force and extension of a spring. He uses the apparatus shown below.
a) Explain how the student can use the apparatus above to investigate the link between force and extension of a spring.
b) The results of the student’s experiment are shown in the table below.
b) The results of the student’s experiment are shown in the table below.
i) Plot her results on the graph below.
ii) Use your graph to estimate the force for the limit of proportionality.
iii) Use your graph to estimate the spring constant.
3) Write the formula that we use to calculate the elastic potential energy of an elastic object. Write the units for all of the values as well.
4) A student stretches a spring 0.2 metres. The spring has a spring constant of 40 N/m. Work out the energy in the spring’s elastic potential energy store.
5) A spring has a spring constant of 42 N/m. Work out the amount of energy in the spring’s elastic potential energy store when it is compressed by 30 cm.
6) A student stretches a spring a certain distance. The spring has a spring constant of 80 N/m and the spring has 0.9 joules in its elastic potential energy store. Find the distance that the spring is stretched. Give your answer in cm.
7) When a spring is stretches by 28 cm, it has 5.88 joules in its elastic potential energy store. Find the spring constant for the spring.
iii) Use your graph to estimate the spring constant.
3) Write the formula that we use to calculate the elastic potential energy of an elastic object. Write the units for all of the values as well.
4) A student stretches a spring 0.2 metres. The spring has a spring constant of 40 N/m. Work out the energy in the spring’s elastic potential energy store.
5) A spring has a spring constant of 42 N/m. Work out the amount of energy in the spring’s elastic potential energy store when it is compressed by 30 cm.
6) A student stretches a spring a certain distance. The spring has a spring constant of 80 N/m and the spring has 0.9 joules in its elastic potential energy store. Find the distance that the spring is stretched. Give your answer in cm.
7) When a spring is stretches by 28 cm, it has 5.88 joules in its elastic potential energy store. Find the spring constant for the spring.