CP15 Forces and Matter Revision Checklist

Explain that more than one force is needed to distort an object.

• A single force is sufficient to distort an object.

• Multiple forces are needed to distort an object.

• Forces do not affect the shape of an object.

• Distortion of an object is not related to forces.

Describe the difference between elastic and inelastic distortion.

• Elastic distortion is reversible, while inelastic distortion is permanent.

• Elastic distortion is permanent, while inelastic distortion is reversible.

• Both elastic and inelastic distortions are reversible.

• Both elastic and inelastic distortions are permanent.

The relationship between force and extension for a spring is described by a Law, which states that the force needed to extend or compress a spring by some distance is proportional to that distance. What is this law called?

• Newton's Law

• Hooke's Law

• Pascal's Law

• Ohm's Law

Compare the force–extension relationship for different objects.

• The force–extension relationship is linear for all objects.

• The force–extension relationship is non-linear for all objects.

• The force–extension relationship can be linear or non-linear depending on the object.

• The force–extension relationship is the same for all objects.

Recall the equation that links force, extension and the spring constant.

• F = kx

• F = ma

• P = IV

Does work have to be done to stretch a spring?

• True

• False

What is the formula relating the energy transferred to the extension of a spring?

• E = k x

• E = mgh

What does the gradient of a Force v Extension graph tell you?

• Pressure

• Energy Stored

• Spring Constant

• Young's Modulus