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Forces - Forces and Elasticity
You might wonder what a slinky is doing in a physics quiz. Spring on down to question 9 to find out!

Forces - Forces and Elasticity

This Physics quiz is called 'Forces - Forces and Elasticity' and it has been written by teachers to help you if you are studying the subject at senior high school. Playing educational quizzes is one of the most efficienct ways to learn if you are in the 11th or 12th grade - aged 16 to 18.

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Elastic materials, such as rubber bands and springs, are flexible and return to their original shape once force is no longer applied. Any elastic material has a limit of proportionality - once this point has been passed, the material will lose all or part of its elasticity and will not return to its original size and shape. Elastic materials can also store energy. This elastic potential energy can then be used to drive other devices, such as wind-up toys and wind-up watches.

A force acting on an object can do what to it?
Change its shape
Make it breakfast
Have no effect on it
Not allow the object to get married
A nice easy start. Remember that forces can do many more things to objects such as change its direction of movement and stop or start movement
If a force acts on an elastic object stretching the object, what kind of energy is stored within the object?
Gravitational potential energy
Tidal energy
Chemical energy
Elastic potential energy
Any elastic device will always store energy as elastic potential energy when a force is applied to it
Which of the following items can store elastic potential energy?
A paper clip
A pencil
A rubber band
A USB pen drive
It is the only one with elastic properties
How is the extension of an elastic object related to the force applied?
Inversely proportional
Directly proportional
Dependent upon the material being extended
None of the above
This means that the more force that is applied to an object, the greater the amount of energy stored will be. Also, the energy will be a multiple of some constant
Which formula correctly states the relationship between force and extension?
F = e
F= 2k x e
F = k x 2e
F = k x e
This only applies below the limit of proportionality
What does k represent in the formula in question 5?
The force on the object
The extension of the object
The spring constant
The constant of extension
It is only relevant to elastic materials that obey Hooke's law
If a material has a spring constant of 10 N/m and is extended by 1 m, what force must have been applied to the object?
5 N
10 N
20 N
50 N
The restoring force would also be 10 newtons
What is the size of the extension of an object which has a spring constant of 30 N/m when a force of 15 N is applied?
This question requires you to rearrange the Hooke's law equation
A slinky is stretched from being a length of 15 cm to a length of 2 m. One end of the slinky is affixed to a point whilst a child pulls on the other end with a force of 10 N. What is the spring constant of the slinky?
5.3 N/m
5.4 N/m
18.5 N/m
20 N/m
This needed the Hooke's law equation rearranging and also remember the extension must be in meters
A spring is stretched to a point where, when released it does not return to its original length. What is this point called?
Fracture limit
Limit of proportionality
Torsion limit
Bohr's limit
If you continue to apply force after the limit of proportionality, the material will be permanently stretched
Author:  Martin Moore

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