1 Which of the following physical quantities is a derived quantity? flag bookmark A Work B Time C Mass D Length T4 Chapter 1.1 Physical Quantities Work is a derived quantity: it is defined from base quantities (W = Fs, unit kg m² s⁻²). Time, mass and length are base quantities.
2 Diagram 1 shows a feather and a stone of different masses experiencing free fall in a vacuum. Which statement is correct about the motion? flag bookmark A The feather and the stone fall with constant velocity B The feather and the stone have the same kinetic energy C The feather and the stone reach the ground at the same time D The gravitational force acting on the feather and the stone is the same T4 Chapter 2.3 Free Fall Motion In a vacuum there is no air resistance, so both fall freely with the same acceleration g and reach the ground at the same time, even though their masses differ.
3 Ahmad throws a stone upwards vertically with an initial velocity of 20 m s$^{-1}$. What is the maximum height that the stone can reach if the air resistance is neglected? [Gravitational acceleration, g = 9.81 m s$^{-2}$] flag bookmark A 10.39 m B 20.39 m C 30.39 m D 40.49 m T4 Chapter 2.3 Free Fall Motion At the maximum height v = 0. v² = u² − 2gs, so s = u²/2g = 20² ÷ (2 × 9.81) = 20.39 m.
4 Diagram 2 shows a cat chasing a rat. The inertia of the cat is bigger than the rat because flag bookmark A The cat runs faster than the rat B The cat has a greater size than the rat C The cat has a greater mass than the rat D The cat has longer legs than the rat T4 Chapter 2.4 Inertia Inertia depends only on mass. The cat has a greater mass than the rat, so its inertia is bigger.
5 Diagram 3 shows a goalkeeper preparing to catch a ball in a soccer match. Which of the following can reduce the impulsive force? flag bookmark A The goalkeeper moves forward before stopping the ball B The goalkeeper moves slightly backwards before stopping the ball C The goalkeeper stood upright and letting the ball be stopped at his body D The goalkeeper stood up straight then jumped up and let the ball rest on his body T4 Chapter 2.7 Impulse and Impulsive Force Moving the hands slightly backwards while catching lengthens the time taken to stop the ball, so the impulsive force F = Δp/t is smaller.
6 Diagram 4 shows three identical satellites P, Q and R which are located at different heights from the Earth's surface. Which shows the correct comparison? *(Gravitational force, F – Gravitational acceleration, g)* flag bookmark A P > Q > R – P < Q < R B P < Q > R – P < Q > R C P < Q < R – P > Q > R D P > Q < R – P > Q < R T4 Chapter 3.1 Newton's Universal Law of Gravitation Q is nearest the Earth (150 km), then P (350 km), then R (600 km). Gravitational force and g both decrease with distance, so they are largest for Q: P < Q > R for both.
7 Which of the following statements does not explain Newton's Universal Law of Gravitation? flag bookmark A The gravitational force is an attractive force B The gravitational force can be attractive force or repulsive force C The gravitational force is directly proportional to the product of the masses of the two bodies D The gravitational force is inversely proportional to the square of the distance between the centre of two bodies T4 Chapter 3.1 Newton's Universal Law of Gravitation The gravitational force is always attractive; it is never repulsive. So statement B does not describe Newton's universal law of gravitation.
8 Diagram 5 shows the Moon revolving around the Earth. The force that pulls the Moon towards the Earth is $2.01 \times 10^{20}$ N. The mass of the Earth is $5.97 \times 10^{24}$ kg and the mass of the Moon is $7.35 \times 10^{22}$ kg. What is the distance between the Earth and the Moon? flag bookmark A $1.92 \times 10^{5}$ km B $3.74 \times 10^{6}$ km C $3.82 \times 10^{5}$ km D $4.12 \times 10^{5}$ km T4 Chapter 3.1 Newton's Universal Law of Gravitation F = GMm/r², so r = √(GMm/F) = √(6.67 × 10⁻¹¹ × 5.97 × 10²⁴ × 7.35 × 10²² ÷ 2.01 × 10²⁰) = 3.82 × 10⁸ m = 3.82 × 10⁵ km. (Note: the answer scheme gives B; on checking, our AI thinks C is more accurate, so both B and C are accepted.)
9 What will happen to a satellite if the Earth's gravitational force on the satellite becomes zero? flag bookmark A The satellite will not move B The satellite will fall on Earth C The satellite will remain orbiting the Earth D The satellite will move in a straight line where the line is a tangent to its original orbit T4 Chapter 3.3 Man-made Satellites Gravity provides the centripetal force that keeps the satellite in orbit. Without it, the satellite keeps moving in a straight line along the tangent to its orbit (Newton's first law).
10 Which of these characteristics represent the non-geostationary satellite? flag bookmark A Located above the same geographical location at the Earth's surface B Orbital period is shorter or longer than 24 hours C Orbital period is the same as the period of rotation of the Earth D Located in a special orbit T4 Chapter 3.3 Man-made Satellites A non-geostationary satellite has an orbital period that is not 24 hours, so it does not stay above the same place on the Earth.