In this experiment, you will determine the power developed when sliding a wooden block across the bench. You are provided with: - a wooden block - five $100\text{ g}$ masses - a spring attached to the block with a piece of string - a $30\text{ cm}$ ruler - a metre rule - a stopwatch. Set up the apparatus as shown in Fig. 1.1. (i) Pull the spring slowly to the right as shown in Fig. 1.1. The spring stretches, as shown in Fig. 1.2, and the block just begins to slide. Hold the…

Physics 5054/32 — October/November 2018

Cambridge O-Level · Practical Test · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

Topics Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation

Q1Observations and MeasurementsExperimental ContextsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will determine the power developed when sliding a wooden block across the bench.

You are provided with:

Set up the apparatus as shown in Fig. 1.1.

Fig. 1.1

(a)

(i)

Pull the spring slowly to the right as shown in Fig. 1.1.

The spring stretches, as shown in Fig. 1.2, and the block just begins to slide. Hold the spring steady in this position.

Fig. 1.2

Measure the stretched length $l_s$ of the spring at this position.

$l_s$ = ______ $\text{cm}$

(ii)

For the spring provided, measure the unstretched length $l_u$ of the spring, as shown in Fig. 1.3.

Fig. 1.3

$l_u$ = ______ $\text{cm}$

Use the equation $e = l_s - l_u$ to calculate the extension $e$ of the spring.

$e$ = ______ $\text{cm}$

(iii)

Use the equation $F = ke$ to calculate the force $F$ applied by the spring, where $k = 0.25\text{ N / cm}$ . Give the unit of your answer.

$F$ = ______ unit ______

(b)

Pull the spring slowly to the right until the block just begins to slide on the bench.

Start the stopwatch and pull the block along the bench, keeping the extension of the spring constant.

Stop the stopwatch when the block has moved $20\text{ cm}$ .

Repeat and find the average value $t$ for the time taken. Show your working.

$t$ = ______ $\text{s}$

(c)

Use the equation

P = \frac{0.20F}{t}

to calculate the power $P$ developed.

$P$ = ______ $\text{W}$

3 more questions

Q2Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation5M
Q3Experimental Contexts · Observations and Measurements · Analysis, Conclusions and Evaluation5M
Q4Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation15M

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