Forces & Elasticity Practice Questions

State what is meant by the extension of the strap.

The strap stays still while it is being stretched.

Explain why more than one force must be applied to the strap in order to stretch it.

When the strap is unhooked it returns to its original length.

Name the type of deformation the strap has undergone.

Calculate the spring constant of the spring.

Spring constant = ........................ N/m

A different pen contains a spring with a spring constant of $650\ \mathrm{N/m}$.

State what this tells you about the second spring compared with the first spring.

Explain, in terms of deformation, why the pointer no longer reads zero.

Name the type of deformation that occurred each time a load of less than $20\ \mathrm{N}$ was hung from the balance.

Determine the extension of the spring when the force was $4.0\ \mathrm{N}$.

Extension = ........................ mm

The student concluded:

'The extension of the spring is directly proportional to the force for all of the forces used.'

Use the table to explain whether the student's conclusion is correct.

Calculate the spring constant of the spring.

Use results from the linear part of the table.

Spring constant = ........................ N/m

Calculate the elastic potential energy stored in the compressed spring.

Use the Physics Equations Sheet.

Elastic potential energy = ........................ J

State the work done by the player on the spring in compressing it, and give a reason for your answer.

Give the independent variable and the dependent variable in this investigation.

One of the results is anomalous.

Identify the anomalous result and suggest one reason why it may have occurred.

Suggest one improvement the student could make to obtain more reliable data.

A person standing on the scales applies a force of $700\ \mathrm{N}$ to the spring.

Calculate the compression of the spring.

Give your answer in metres.

Compression = ........................ m

Explain why the scales would give incorrect readings if the spring were compressed beyond its limit of proportionality.

Determine the spring constant of the spring.

Spring constant = ........................ N/m

Calculate the elastic potential energy stored in the spring when the extension is $0.060\ \mathrm{m}$.

Use the Physics Equations Sheet.

Elastic potential energy = ........................ J

When the extension of the spring is $0.100\ \mathrm{m}$ the force applied is $7.4\ \mathrm{N}$.

Explain why the equation $E_e = \tfrac{1}{2}ke^2$ cannot be used to calculate the energy stored at this extension, and state how the energy stored could be found from Figure 1.