OCR A Physics - Materials

Front

What is a tensile force?

Back

A force that produces an extension of the object.

Front

What is a compressive force?

Back

A force that reduces the length of an object.

Front

What is Hooke's Law?

Back

Force is proportional to extension as long as the elastic limit is not exceeded.

Front

What is elastic deformation?

Back

It is when an object returns to its original shape after the load is removed.

Front

What is plastic deformation?

Back

A permanent change in shape that remains once the load is removed.

Front

What is k in F = kx?

Back

The force constant.

Front

What are the units of the force constant (k)?

Back

N m⁻¹

Front

What is represented by the area under a force-extension graph?

Back

The work done in stretching the object.

Front

What is meant by an elastic material?

Back

A material that can be significantly deformed and will return to its original shape.

Front

What is tensile stress?

Back

The force applied per unit cross-sectional area.