neco 2021 physics | Practical

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Question 1 View Details
A metal rod has a true length of 150.0 cm. Using a metre rule and a vernier caliper, a student records three independent measurements of the rod's length as follows: 149.6 cm, 149.8 cm and 149.5 cm. The student is required to:
Question Parts
(a)
Calculate the mean of the three measurements.
(b)
Determine the percentage error of the mean value with respect to the true length.
(c)
Suggest two possible sources of error that could have contributed to the discrepancy between the measured mean and the true length.
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Question 2 View Details
In a force table experiment, two forces are applied as follows: - Force \(F_{1}\) = 5.0 N acting due east. - Force \(F_{2}\) = 3.0 N acting at 45° north of east. The resultant force is measured with a spring scale and recorded as 7.6 N. The student must:
Question Parts
(a)
Resolve \(F_{2}\) into its eastward and northward components.
(b)
Determine the theoretical magnitude of the resultant of \(F_{1}\) and \(F_{2}\).
(c)
Calculate the percentage difference between the measured resultant (7.6 N) and the theoretical resultant.
(d)
State two possible reasons for the discrepancy between the measured and theoretical resultant.
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Question 3 View Details
A simple pendulum is set up to determine the acceleration due to gravity (g). The length of the pendulum is measured as 0.500 m using a metre rule (least count 1 mm). The bob is displaced through a small angle of 5° and released. The time for 10 complete oscillations is recorded for five trials as follows: 14.85 s, 14.80 s, 14.90 s, 14.88 s, 14.86 s. Using the data, determine g and evaluate the experiment.
Question Parts
(a)
Calculate the average period of one oscillation (in seconds) from the given data.
(b)
Using the small‑angle correction, \(T = 2\pi\sqrt{L/g}\,(1+\theta^{2}/16)\), where \(\theta\) is in radians, calculate the value of g (in m s⁻²).
(c)
Find the percentage error of the experimental value of g with respect to the accepted value 9.81 m s⁻².
(d)
State two possible sources of error that could have caused the obtained value of g to be lower than the accepted value.
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Question 4 View Details
A smooth wooden block of mass 0.80 kg is placed on an adjustable inclined plane. The plane is set at three different angles and the force required to pull the block up the plane at constant speed is recorded using a spring balance. The data obtained are:
Question Parts
(a)
For each angle (30°, 35°, 40°), calculate the frictional force acting on the block (in newtons).
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