Forces: Required Praticle Stretching A Spring

Question 1

What is the purpose of this practical?

Answer 1

• ## Investigate relationship between force and extension of a spring.

Question 2

What is the equipment for this practical?

Answer 2

• Clamp Stand.
• Two bosses.
• Two clamps.
• Place heavy weight on clamp stand to prevent falling over.
• Attach a meter ruler and a spring.
• Top of spring must be at 0 on the meter ruler.
• Bottom of Spring: Has wooden splint attached as a pointer + must be horizontal or readings will be innacurate.
• ## Meter Ruler= Vertical otherwise readings will be innacurate.

Question 3

What is the method of this practical?

Answer 3

1) Read position of pointer on the meter ruler. Unstretched length of spring (Length with no force attached).
2) Hang a 1 N weight on the spring + Read new position of the pointer on the meter ruler.
3) Continue adding 1 N weights to the spring + Reading the position of the pointer.

Question 4

How do we work out the extension produced by adding each weight?

Answer 4

• Subtract length of unstretched spring from each reading.

- Plot the graph.

Question 5

What does the weight to extension graph look like?

Answer 5

Spring Graph: Elastic.

• Straight line going through the origin.
• Extension is directly porportionate to the weight.
• Linear relationship.
• Remove weight: Extension returns 0.

Rubber Band:

• No straight line.
• Non-Linear Relationship.

Question 6

What happens if you add too much weight to the spring?

Answer 6

• Non-Linear.
• Overstretched spring- Exceeded limit of poportionality.
• If we took all the weight away it will still show an extension.
• Inelastic deformation.
• -

Question 7

How do we determine the spring constant using the linear part of the graph?

Answer 7

• Dividing the force (weight) by the extension.

- Spring constant will be the same for any part of the graph as long as we don’t exceed the limit of porportionality.