New
New
Year 10
Edexcel
Higher

# Stretching a spring practical

I can measure the extension of a spring and describe its properties as it increases in length.

New
New
Year 10
Edexcel
Higher

# Stretching a spring practical

I can measure the extension of a spring and describe its properties as it increases in length.

## Lesson details

### Key learning points

1. Stretching or compressing an object requires more than one force.
2. Below the limit of proportionality, a stretched spring is not stretched permanently out of shape.
3. Above the limit of proportionality, a stretched spring is stretched permanently out of shape.

### Common misconception

Extension is the extra amount the spring has stretched when a bigger force is applied.

Ensure pupils fully remove each hanging mass between measurements so they see the extension of the spring from its original length each time.

### Keywords

• Extension - The increase from the original length of a spring when it is stretched.

• Elastic deformation - The stretch of a spring that returns to its original shape when the stretching force is removed.

• Inelastic deformation - The stretch of a spring as it is permanently stretched out of shape.

• Limit of proportionality - The largest extension of a spring before it is stretched out of shape.

Place a cardboard box beneath each set of hanging masses so that, if they fall, the impact does not damage the mass hanger. Often the box (or other padding) can be placed on top of a stool so that the possible length of fall is reduced.
Teacher tip

### Equipment

Apparatus to measure the extension of a 'Hooke's Law spring' to destruction with hanging masses of 12.0 N in 1.0 N increments.

### Content guidance

• Risk assessment required - equipment

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
The energy an object has because it is moving is in the energy store.
Q2.
The energy an object has because it is stretched or squashed is in the energy store.
Q3.
Friction or air resistance can cause energy to into the surroundings.
disperse
expand
refract
Q4.
An object hangs from a rope. Which of the follwoing is equal to the force exerted on the rope by the object?
the mass of the object
the speed of the object
Correct answer: the weight of the object
the kinetic energy of the object
Q5.
An object has mass 5 kg. Which of following is closest to the weight of the object?
0.5 kg
0.5 N
5 N
50 kg
Q6.
The following graphs plot variable 1 on the \$\$x\$\$–axis and variable 2 on the \$\$y\$\$–axis. On which graph is variable 1 directly proportional to variable 2?
Correct Answer: An image in a quiz

## Exit quiz

### 6 Questions

Q1.
Match the following terms to their definitions (for a spring).
Correct Answer:extension,the difference between the spring's stretched and unstretched length

the difference between the spring's stretched and unstretched length

Correct Answer:elastic deformation,a reversible (temporary) change in length of a spring

a reversible (temporary) change in length of a spring

Correct Answer:inelastic deformation,a permanent change in length of a spring

a permanent change in length of a spring

Q2.
The diagram shown is of a spring in its unstretched state and when it is stretched. Which arrow, A, B, C, or D, shows the extension of the stretched spring?
A
C
D
Q3.
The limit of proportionality of a spring is the largest possible extension before the spring …
undergoes elastic deformation.
becomes temporarily deformed.
Q4.
The following graph shows the extension of a spring against the stretching force. Which point, A, B, or C, shows the position of the limit of proportionality?
A
C
Q5.
A pupil investigates how the extension of a spring varies with the force stretching it. Which of the following safety precautions are necessary for this investigation?
Tie long hair back.