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Edexcel | Physics WPH0 | W 12 6 1 | 1 hour 30 minutes

Boards | Edexcel | Physics WPH0

Search By AI inside Physics WPH0 | Type Exam Code | Subject Code | keyword To Search

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Q1
Q2
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2

A student measures the acceleration of a drinks can as it rolls down a ramp. He wants to

use this acceleration to find a value for g.

2

(a)

2

(a) (I)

2 Mark s

Shows a measured height or distance along bench

uses correct trigonometry

2

(a) (II)

2 Mark s

Explain why your method gives good precision.

Max 2

• Distances large

• (hence) at least 3 SF

• small percentage uncertainty

• precision of protractor is 1o

2

(b)

To find the acceleration he measures the time t it takes for the can to roll a distance s

down the ramp.

2

(b) (I)

1 Mark

He uses a metre rule to mark a distance s = 1.000 m on the ramp. Estimate the

percentage uncertainty in this measurement.

0.1% or 0.2% (uncertainty is 1 or 2 mm )

2

(b) (II)

1 Mark

He uses a stopwatch to measure t.

State one technique he can use to reduce the uncertainty in this measurement.

Any valid physics technique

eg Repeat the reading and find the mean

Keep eye level with can (do not accept simply “avoid parallax”)

2

(c)

The student determines the mean value for t as 1.20 s with an uncertainty of 0.10 s.

2

(c) (I)

1 Mark

Use his value to calculate the acceleration of the can.

2

(c) (II)

2 Mark s

Estimate the overall percentage uncertainty in his value for the acceleration.

Percentage uncertainty in t = 8.3 % (8 %)

doubles percentage uncertainty in t and adds percentage uncertainty in s

from b(i)

Also allow ecf from b(i)

Example of calculation

0.10/1.20 = 8.3% so overall 16.6% + 0.1% or 0.2% = 17%

Allow 16% overall if 8% used for t

2

(d)

The student assumes that the acceleration of the can is given by a = g sin?.

2

(d) (I)

1 Mark

2

(d) (II)

1 Mark

Calculate the percentage difference between this value for g and the accepted

value for g.

Calculates %D using 9.81 as denominator

Example of calculation

1.81/9.81 = 18.45% Allow 18% or 19%

2

(d) (III)

1 Mark

Comment based on comparison of %D with %U

Example of calculation

%D is not explained by %U - 2% bigger

so assumptions not valid

Q1
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Q4

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