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Edexcel | Physics 4PH0 | W 17 1 | Q3

W 17 1
3
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A student investigates a toy.

● the toy has three woodpeckers

● each woodpecker is attached to a wooden ring by a spring

● a metal rod passes through the wooden rings

● the woodpeckers have different masses

● the springs are identical

When a woodpecker is pulled back and released, it vibrates and moves down the rod.

W 17 1
3
(a)
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A student uses this method to investigate the toy.

  ● measure the mass of woodpecker A

  ● move woodpecker A to the start point and release it

  ● record the time it takes for woodpecker A to travel 20 cm

  ● repeat the test two more times

  The student uses the same method for woodpeckers B and C.  

The table shows the student’s results.

W 17 1
3
(a) (I)
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1 Mark

One of the time measurements in the table is anomalous. 

   Draw a circle around this anomalous measurement.

 

3.1 ONLY circled in the table; 

W 17 1
3
(a) (II)
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1 Mark

State the relationship between average speed, distance moved and time taken.

 

   

 

(average) speed = distance (moved)/time

(taken);

 

 

 

accept words or

standard symbols

 

 

 

W 17 1
3
(a) (III)
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4 Mark s

Calculate the average (mean) speed for woodpecker B.

average speed = ............................................. cm/s

   

discards anomalous result; 

calculates mean time for B; 

substitution; 

evaluation; 

e.g. 

average time = 4.7                   gets 1 marks 

average time = 5.5                   gets 2 marks 

speed = 20/ 5.5                      gets 3 marks 

 =3.7                                       gets 4 marks 

 

allow 4.67 

Allow 5.45 

allow 20/5.45 

Allow 3.67

 

 

 

W 17 1
3
(a) (IV)
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2 Mark s

 

Explain what type of graph the student should use to present his data.

 

   

 

explanation including the following ideas

EITHER

bar chart;

because woodpeckers are discrete / eq;

OR 

mass is a continuous variable; 

therefore scatter-gram / eq;

 

 

condone histogram

DOP

 

 

DOP

allow line graph 

 

 

W 17 1
3
(b)
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3 Mark s

Before carrying out his investigation, the student made this prediction.

Discuss whether the student’s results support his prediction.

 

   

 

discussion to include any 3 ideas from: 

MP1. there is no (discernible) pattern; 

MP2. supporting data quoted;

 

 

 

 

MP3. discussion of why prediction is wrong/ C

should be fastest; 

MP4. three data sets is insufficient to decide;

 

MP5. need for further data to extend range of

results;

 

 

no mark for

unqualified ‘yes’ or

‘no’ 

results don’t go in

order/eq

allow calculated

speeds (cm/s)

A= 1.8

B= 3.7 (4.3)

C = 2.3

A heaviest,slowest;

B middle, fastest;

C lightest, middle 

 

 

ignore discussion of

anomalies 

 

 

 

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