GCSEPhysics: Combined ScienceOCR GatewayTopic Questions2. Forces2.5 Forces & Elasticity

Forces & Elasticity (OCR Gateway GCSE Physics: Combined Science)

Topic Questions

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1a3 marks

A student has a spring, a ruler and a 2.0 N weight.

a)
Describe how the student can use this equipment to determine the spring constant of the spring.

[3]

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1b2 marks
b)
The 2.0 N weight has a surface area of 0.005 m2.
Calculate the pressure when it is placed on a surface.
Use the equation: pressure = force normal to a surface ÷ area of that surface
 
 

Pressure = ................................................... Pa [2]

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1c2 marks
c)
Describe how to change the shape of an object.

Use the idea of forces in your answer.



[2]

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1d2 marks
d)
Describe the differences between elastic and plastic deformation.

[2]

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2a5 marks

A student investigates how a spring stretches.

She measures the original length of the spring, adds a 2.0 N weight, and then measures the extended length of the spring.

Look at her data in the table.

Force used 2.0 N
Original length 3.0 cm
Extended length 7.0 cm
Extension 4.0 cm

a)
i)
Calculate the spring constant for the spring.
 
Use the equation: force = spring constant × extension

Spring constant = ............................................... N/cm [3]



ii)
Suggest two ways that the student could improve and develop their method to find the spring constant.

[2]

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2b2 marks
b)
The spring constant of a different spring is 40 N/m.

Calculate the energy stored in the spring when it is stretched 0.20 m.

Use an equation from the data sheet to help you.

Energy stored = ...................................................... J [2]

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2c3 marks
c)
The diagram shows an experiment a student set up to study moments.
 

q21c-paper1-oct-nov2020-ocr-gcse-physics

The student:

• holds the metre rule so that it is horizontal
• adds weights to the metre rule at different distances from the pivot.

i)
Calculate the moments of the 2 N weight and the 3 N weight about the pivot.

Use the equation: moment = force × distance from pivot


Moment of 2 N weight = .......................................................N cm

Moment of 3 N weight = .......................................................N cm

[2]

ii)
Which way will the metre rule rotate when it is released by the student?

[1]

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3a2 marks

The force–extension graphs for four different springs (A, B, C and D) are shown below.

q20-paper1-specimen-ocr-gcse-physics

a)
Explain which of the springs (A, B, C or D) has the largest spring constant?
[2]

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3b2 marks
b)
Explain why the line for spring B has a different shape from the other lines.

[2]

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3c8 marks
c)
i)
A spring has a spring constant of 27 N/m.

The spring is stretched to an extension of 25 cm.

The energy transferred can be calculated using the formula:

energy transferred = 0.5 × spring constant × extension2.

Calculate the energy transferred in stretching.
Answer .......................... J [2]
ii)
A student set up the apparatus shown in Fig. 20.1.
fig-20-1-paper1-specimen-ocr-gcse-physicsFig. 20.1

The students want to plot a force–extension graph for this spring.

Describe how they could use this apparatus to collect data so that the graph could be plotted.

[4]

iii)
The spring in Fig. 20.1 has a spring constant of 30 N/m.
This is replaced by a spring with a spring constant of 10 N/m.

What changes should the student make to this method to investigate this spring?

[2]

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