P2P15 - Forces and matter

Question 1

What does elastically deformed mean

Answer 1

An elastically deformed object will return to its original shape when the force stops.

A spring is an elastic object.
Springs return to their original shape when forces stop acting on them.

Question 1

What does inelastically deformed mean?

Answer 1

An inelastically deformed object will not return to its original shape when the force stops.

A car is an inelastic object.
After a car has crashed into a tree, it will not return to its original shape.

Question 2

What does Hookes law state?

Answer 2

Hooke’s Law tells us that the extension of a spring is directly proportional to the force applied to the spring:
          force = spring constant x extension

When a spring is stretched, the increase in the length of the spring is called its “extension”.

Question 3

Whats the equation for spring extension?

Answer 3

Spring extension =
Force applied / Spring constant

Question 4

Whats the equation for spring extension?

Answer 4

Extension =
Length of loaded spring − Natural length of spring

Question 5

How do you investigate Hooke’s law?

Answer 5

1. First, measure the original length of the spring.
2. Next, hang different masses on the spring and measure the length of the spring in each case.
3. Adding masses to the spring increases the downwards force as each mass has weight.
4. The extension of the spring equals the length with masses minus the original length:
5. extension of the spring = length of the spring with masses − original length of the spring.
6. Plot a graph with extension of the spring on the x axis and force on the y axis.

Question 6

Whats the equation for Elastic Potential Energy Stored in a Spring?

Answer 6

elastic potential energy =
1/2 X spring constant X extension squared

Question 7

What is atmospheric pressure?

Answer 7

The force per unit of area created by the weight of the air (particles) in the atmosphere.