igcse model questions vol1 2019 physics | Practical

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Question 1 View Details
You are required to determine the density of an unknown metal using the water‑displacement method. The metal specimen is first weighed on an electronic balance and then its volume is measured by the rise in water level in a graduated cylinder. The following data are recorded: - Mass of metal (m) = 45.62 g - Initial water volume = 150.0 mL - Final water volume after immersion = 165.3 mL - Temperature of water = 22 °C (density of water at 22 °C = 0.9978 g mL⁻¹) Answer the questions below.
Question Parts
(a)
Calculate the volume of the metal specimen in cubic centimetres (cm³).
(b)
Determine the density of the metal in kg m⁻³, showing all steps of unit conversion.
(c)
State two possible sources of error in this experiment and suggest a method to reduce each error.
(d)
If the metal is identified as aluminium (standard density 2700 kg m⁻³), comment on the accuracy of your result.
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Question 2 View Details
A force table is set up to determine the resultant of two forces acting in the same plane. The table is level, and a 100‑g mass is used as a pointer to indicate equilibrium. The following forces are applied: - Force A: 5.0 N acting at 30° north of east. - Force B: 8.0 N acting at 120° measured anticlockwise from east. The pointer is adjusted until it remains stationary, indicating that the forces are in equilibrium. Answer the questions below.
Question Parts
(a)
Resolve each force into its horizontal (x) and vertical (y) components, giving values to two decimal places.
(b)
Using the components found in part (a), calculate the magnitude and direction (angle measured anticlockwise from east) of the resultant force. Give the magnitude to two decimal places and the angle to the nearest degree.
(c)
Describe briefly how you would draw the vector diagram on the force table to verify the resultant obtained in part (b).
(d)
Identify two sources of error that could affect the equilibrium condition on the force table and suggest a way to minimise each error.
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Question 3 View Details
A student investigates the motion of a marble down a smooth wooden ramp. The ramp length is 1.20 m. The ramp can be set at different angles. For each angle the marble is released from rest at the top and the time taken to travel the whole length is measured with a stopwatch. The recorded times are:
Question Parts
(a)
Calculate the linear acceleration of the marble for each angle (15°, 30°, 45°). Use the equation s = ½ a t² where s = 1.20 m.
(b)
Using the accelerations obtained, comment on whether the acceleration is proportional to sin θ. Show the reasoning with appropriate calculations.
(c)
Suggest two practical improvements that could reduce the discrepancy observed in part (b).
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Question 4 View Details
A wooden block of mass 0.80 kg is placed on a rough wooden incline that can be set at different angles. The block is held stationary by a spring balance attached to the block and pulling up the plane. For each angle the tension T shown on the balance is recorded when the block is just about to move up at constant speed. The distance the block moves while the balance is reading is 0.50 m. The data obtained are:
Question Parts
(a)
For each angle (20°, 25°, 30°) calculate the coefficient of kinetic friction μ_k using the equilibrium condition T + μ_k mg cosθ = mg sinθ. Take g = 9.8 m s⁻².
(b)
Determine the average value of μ_k from the three measurements and state it to two significant figures.
(c)
Using the average μ_k, calculate the work done by friction when the block moves the 0.50 m distance at the 30° setting. State the sign of the work and give the answer in joules to two significant figures.
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