1.1 Which physical quantity is equal to the rate of change of momentum?
A Mass
B Impulse
C Net force
D Acceleration (2)
1.2 The gravitational acceleration on the surface of a planet of radius R is g.
The gravitational acceleration at a height of 2R above the surface of the same planet is …
1.3 A ball falls from the edge of a table. Ignore the effects of air friction.
Which ONE of the physical quantities associated with the ball during the fall remains constant?
A Weight
B Momentum
C Kinetic Energy
D Gravitational potential energy (2)
1.4 Two trolleys, X and Y, of masses m and 2m respectively, are held together by a compressed spring
between them. Initially they are stationary on a horizontal floor, as shown below. Ignore the effects of
friction.
The spring is now released and falls to the floor while the trolleys move apart.
The magnitude of the MOMENTUM of trolley X while it moves away is …
A zero
B half the magnitude of the momentum of trolley Y
C twice the magnitude of the momentum of trolley Y
D the same as the magnitude of the momentum of trolley Y (2)
1.5 An object is dropped from rest and after falling a distance x, its momentum is p. Ignore the effects of air friction.
The momentum of the object, after it has fallen a distance 2x, is …
1.6 A police car, with its siren on, is travelling at a constant speed TOWARDS a stationary sound detector.
The siren emits sound waves of frequency f and speed v.
Which ONE of the following combinations best describes the frequency and speed of the detected
sound waves? (2)
1.7 Two identical spheres, R and S, on insulated stands, carrying charges of +q and –q respectively, are
placed a distance apart. Sphere R exerts an electrostatic force of magnitude F on sphere S.
The two spheres are now brought into contact and returned to their original positions.
The magnitude of the electrostatic force that sphere R exerts on sphere S is now …
1.8 Which ONE of the graphs below best represents the relationship between potential difference (V) and current (I) for an ohmic conductor?
1.9 Which ONE of the following combinations regarding the energy conversions in electric motors and electric generators is CORRECT?
1.10 Consider the statements below regarding the photoelectric effect.
The photoelectric effect proves that …
(i) light energy is quantised.
(ii) light has a particle nature.
(iii) light has a wave nature.
Which of the statements above is/are CORRECT?
A (i) only
B (ii) only
C (i) and (ii) only
D (i) and (iii) only (2)
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