physics - force and extension

Question 1

what are the steps of the practical?

Answer 1

• hang a spring from a clamp stand alongside a metre rule
• measure the springs’ initial length
• add weights in 10N intervals and record the extension each time
• plot a graph of extension against force

Question 2

how to calculate extension when you add the mass?

Answer 2

subtract the extended length of the spring from the original (unstretched) spring length

Question 3

what can you add to the spring to make the readings of extension more accurate?

Answer 3

a pointer (like a splint) attached horizontally to the base of the spring and extending to the metre rule. This will make reading the length easier

Question 4

Why should you wear safety glasses/goggles?

Answer 4

in case the spring breaks or becomes detached and damages your eyes

Question 5

what else should you do to remain safe?

Answer 5

• Avoid standing with your feet underneath where the weights are hanging in case they fall
• Wear appropriate footwear

Question 6

What graph should you plot using the results?

Answer 6

extension against force (weight) ~ it should be a straight line through the origin

Question 7

What is the name of the relationship between extension and force?

Answer 7

Hooke’s law:
force = spring constant x extension