1.5 Forces

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Question 5

The class is investigating the behaviour of a spring, and then using the spring to determine the weight of an object.

A student hangs various loads $L$ on the spring and records the stretched length $l$ of the spring. The readings are shown in the table below.

Table 2.1

$\text{N}$	$\text{cm}$
1.0	8.1
2.0	11.0
3.0	13.9
4.0	17.2
5.0	19.8

Suggest one precaution that you would take when measuring the length of the spring, to ensure a reliable reading.

[1]

The student plots a graph of $l/cml/\text{cm}$ ( $y$ -axis) against $L/NL/\text{N}$ ( $x$ -axis). The resulting best-fit straight line has a gradient of $cm/N3.0\text{ cm/N}$ and passes through the point $(2.0, 11.0)$ .

Use this line of best fit to determine: (i) the unstretched length $l_0$ of the spring. (ii) the weight $W$ of an object that gives a stretched length of $15.5\text{ cm}$ .

[4]

A student measures the weight of a different load using this same method. He gives the weight as $N2.564\text{ N}$ .

Explain why this is not a suitable number of significant figures for this experiment.

[2]

1.5 Forces

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Question 5

The class is investigating the behaviour of a spring, and then using the spring to determine the weight of an object.

A student hangs various loads $L$ on the spring and records the stretched length $l$ of the spring. The readings are shown in the table below.

Table 2.1

$\text{N}$	$\text{cm}$
1.0	8.1
2.0	11.0
3.0	13.9
4.0	17.2
5.0	19.8

Suggest one precaution that you would take when measuring the length of the spring, to ensure a reliable reading.

[1]

Use this line of best fit to determine: (i) the unstretched length $l_0$ of the spring. (ii) the weight $W$ of an object that gives a stretched length of $15.5\text{ cm}$ .

[4]

A student measures the weight of a different load using this same method. He gives the weight as $N2.564\text{ N}$ .

Explain why this is not a suitable number of significant figures for this experiment.

[2]

1.5 Forces

Question 5

Table 2.1

Markscheme

1.5 Forces

Question 5

Table 2.1

Markscheme

1.5 Forces

Question 5

Table 2.1

1.5 Forces Questions

1.5 Forces

Question 5

Table 2.1

1.5 Forces Questions