Force

Figure below shows the weight of the same astronaut on earth and on the moon. Explain the difference in his weight. (SPE/2018/Q18)

• The force of gravity on the moon is equal to that on earth.

• The force of gravity on the moon is lesser than that on earth.

• The force of gravity on the moon is more than that on earth.

• The force of gravity on the moon is zero.

An astronaut carried out an experiment on the surface of the moon by dropping a screwdriver and a piece of tissue paper from the same height and at the same place. it was observed that both objects reached the moon’s surface at the same time. What is the explanation for this observation?

(SPE/2009/Q9)

• There is no friction because the moon has no atmosphere.

• The screwdriver and tissue paper have the same weight in a vacuum.

• The screwdriver and tissue paper have the same mass on the moon.

• There is no gravity on the moon.

Figure below shows Azim pushing a box on the floor.

What type of force R is acting in the opposite direction on the box? (SPE/2011/Q16)

• Friction.

• Gravity.

• Magnetic.

• Turning.

Study the experiment in figure below.

To ensure a fair test, which of the following variables should stay the same throughout the experiment?

(SPE/2015/Q16)

• A

• B

• C

• D

Malik carried out an experiment to find out how different surfaces A, B, C and D affect the distance moved by a 200 g wooden block. The same amount of force was applied to the wooden block as indicated by the arrow. Which of the surfaces below produces the most friction?

(SPE/2016/Q19)

• A

• B

• C

• D

Snails produce mucus to help them along the ground. How does the mucus help snails move?

(SPE/2018/Q17)

• Mucus leaves a trail on the ground.

• Mucus lowers the temperature of the ground.

• Mucus reduces friction.

• Mucus reduces the snail’s mass.

If you give a book a sharp push along a table, it will move a short

distance before slowing down to a stop. What causes the book to

stop moving?

• The force of gravity pulls it down.

• There is air resistance between the book and the table.

• There is a frictional force between the book and the table.

• There is an electrical force generated between the book and the table.

When you throw a basketball upwards, it will fall back downwards. Which of the following is true?

• No force acts on the ball, hence the ball slows down.

• The ball falls back to the ground due to the force of gravity.

• The ball was not thrown with enough force to prevent it from slowing down

• A force in the air causes the ball to fall faster towards the ground.

Which one of the following causes your shoes to wear out?

• Weight

• Friction

• Pressure

• Polishing

It is difficult to walk on an oily floor because

• Floor gets spoiled.

• There is more resistance.

• Force of friction is high.

• Force of friction is very less.