5.3 Forces and elasticity

Question 1

What is the relation between the extension and the force applied? (1)

Answer 1

The extension is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.

Question 2

What is an inelastic deformation? (1)

Answer 2

When an object is permenantely stretched and doesn’t return to its original shape when the force is removed.

Question 3

What is the equation relating force, spring constant and extension? (1)

Answer 3

Force (N) = spring constant (N/m) x extension [compression] (m)

Question 4

What happens when a spring is stretched or compressed? (1)

Answer 4

Elastic potential energy is stored in the spring.

Question 5

How is work done on a spring? (1)

Answer 5

When a force stretches or compresses a spring.

Question 6

What is the relation between the work done and the energy stored in a spring? (1)

Answer 6

The work done on the spring is equal to the elastic potential energy stored in the spring, provided that there is no inelastic deformity.