Starter quiz
- The energy an object has because it is moving is in the ______ energy store.
- 'kinetic' ✓
- The energy an object has because it is stretched or squashed is in the ______ energy store.
- 'elastic' ✓
- Friction or air resistance can cause energy to ______ into the surroundings.
- dissipate ✓
- disperse
- expand
- refract
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- 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
- the weight of the object ✓
- the kinetic energy of the object
-
- 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
- 50 N ✓
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- The following graphs plot variable 1 on the –axis and variable 2 on the –axis. On which graph is variable 1 directly proportional to variable 2?
Exit quiz
- Match the following terms to their definitions (for a spring).
- extension⇔the difference between the spring's stretched and unstretched length ✓
- elastic deformation⇔a reversible (temporary) change in length of a spring ✓
- inelastic deformation⇔a permanent change in length of a spring ✓
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
- B ✓
- C
- D
-
- The limit of proportionality of a spring is the largest possible extension before the spring …
- undergoes elastic deformation.
- undergoes inelastic deformation. ✓
- becomes permanently deformed. ✓
- becomes temporarily deformed.
-
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
- B ✓
- C
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- 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.
- Wear safety glasses. ✓
- Clamp the clamp stand to the desk. ✓
- Use a set square to avoid parallax error.
- Put padding on the floor under the mass holder. ✓
-
- A spring has extension of 4 cm when it experiences a stretching force of 5 N. If the spring does not reach its limit of proportionality, the extension is ______ cm when the stretching force is 15 N.
- '12' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Stretching or compressing an object requires more than one force.
- Below the limit of proportionality, a stretched spring is not stretched permanently out of shape.
- 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.
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