IGCSE Physics MCQs 03 - Forces and Motion

Which statement correctly describes the effects of placing a heavy load in a car?

• It is easier to accelerate the car and easier to bring the car to rest.

• It is easier to accelerate the car but more difficult to bring the car to rest.

• It is more difficult to accelerate the car and more difficult to bring the car to rest.

• It is more difficult to accelerate the car but easier to bring the car to rest.

A mass of 6.0 kg rests on the surface of a planet. On this planet, g = 20 N/kg.

What is the weight of the object?

• 0.30 N

• 0.60 N

• 60 N

• 120 N

A space probe is taken from the Earth to Mars. The force of gravity on the surface of Mars is less than the force of gravity on the surface of the Earth.

How do the weight and the mass of a space probe on the surface of Mars compare to their values when the probe is on the surface of the Earth?

• Mars Weight: decreased; Mars mass: decreased

• Mars Weight: decreased; Mars mass: unchanged

• Mars Weight: unchanged; Mars mass: decreased

• Mars Weight: unchanged; Mars mass: unchanged

A satellite orbits the Earth at constant speed in circular orbit. Which statement is correct?

• The resultant force on the satellite is zero.

• The resultant force on the satellite is towards the Earth.

• The resultant force on the satellite is away from the Earth.

• The resultant force on the satellite is in the direction of motion.

Two forces P and Q act on an object. Which diagram shows the resultant of these two forces?

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• The acceleration of the ball decreases.

• The acceleration of the ball increases.

• The speed of the ball decreases.

• The gravitational force on the ball decreases.

• The horizontal speed is greater on the Moon and the ball hits the floor 4.0 m in front of the spring.

• The horizontal speed is greater on the Moon and the ball hits the floor more than 4.0 m in front of the spring.

• The horizontal speed is the same on the Moon and the ball hits the floor 4.0 m in front of the spring.

• The horizontal speed is the same on the Moon and the ball hits the floor more than 4.0 m in front of the spring.

Which choice describes speed and velocity?

• Speed: scalar | Velocity: scalar

• Speed: scalar | Velocity: vector

• Speed: vector | Velocity: scalar

• Speed: vector | Velocity: vector

Four balls with different masses are dropped from the heights shown. Air resistance may be ignored. Which ball has the smallest average speed?

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An object of mass 2.0 kg is taken from the Earth, where the gravitational field strength is 10 N/kg, to the Moon, where the gravitational field strength is 1.6 N/kg.

Which row is correct?

• Earth weight: 0.20 N | Moon weight: 0.80 N

• Earth weight: 0.20 N | Moon weight: 3.2 N

• Earth weight: 20 N | Moon weight: 0.80 N

• Earth weight: 20 N | Moon weight: 3.2 N