# Physical Processes - Forces In Action

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Quizzes Created: 4 | Total Attempts: 3,538
Questions: 10 | Attempts: 630

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Questions and Answers
• 1.

### A girl stands still holding a racket on a tennis court. A ball is coming towards her. Which two forces are balanced?

• A.

Her weight and a reaction force from the ground

• B.

Air resistance on the ball and gravity

• C.

The force of her opponent's hit on the ball and air resistance

Correct Answer
A. Her weight and a reaction force from the ground
Explanation
When the girl stands still holding a racket on a tennis court, her weight acts downwards due to gravity. At the same time, a reaction force from the ground acts upwards to balance her weight. These two forces are balanced because the upward reaction force from the ground cancels out the downward force of her weight, allowing her to maintain her position on the tennis court.

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• 2.

### When an object falls, air resistance ...

• A.

Acts in the opposite direction to the weight

• B.

Acts in the same direction to the weight

• C.

Does not act at all

Correct Answer
A. Acts in the opposite direction to the weight
Explanation
When an object falls, it experiences the force of gravity pulling it downward, which is known as its weight. At the same time, the object also experiences air resistance, which is a force exerted by the air in the opposite direction to the object's motion. This air resistance acts in the opposite direction to the weight, slowing down the object's fall. Therefore, the correct answer is that air resistance acts in the opposite direction to the weight.

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• 3.

### Weight is a force and is measured in ...

• A.

Newtons

• B.

Kilograms

• C.

Metres

Correct Answer
A. Newtons
Explanation
Weight is a force that is measured in Newtons. Newtons is the standard unit of force in the International System of Units (SI). It is named after Sir Isaac Newton, who formulated the laws of motion. Weight is the force exerted on an object due to the gravitational pull of the Earth or any other celestial body. The magnitude of this force is measured in Newtons, which is equal to the mass of the object multiplied by the acceleration due to gravity.

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• 4.

### Where would you feel heaviest?

• A.

The Earth

• B.

The moon

• C.

You would feel equally heavy on both

Correct Answer
A. The Earth
Explanation
The Earth is the correct answer because it has a much larger mass compared to the moon. The force of gravity is directly proportional to the mass of an object, so the greater the mass, the greater the gravitational force. Therefore, you would feel heaviest on Earth due to its stronger gravitational pull.

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• 5.

### Which of the following is TRUE?

• A.

Gravity only acts through air, not through water or land

• B.

Gravity does not act on aeroplanes flying in the sky

• C.

Gravity always acts towards the centre of the earth

Correct Answer
C. Gravity always acts towards the centre of the earth
Explanation
Gravity is a force that attracts objects towards the center of the earth. This force is present everywhere, whether it is in air, water, or on land. It acts on all objects, including aeroplanes flying in the sky. Therefore, the statement "Gravity always acts towards the centre of the earth" is true.

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• 6.

### If gravity pulls you towards the centre of the earth, why don't you fall through the pavement?

• A.

Because gravity doesn't act through pavements

• B.

The pavement exerts an equal force in the opposite direction

• C.

Because gravity runs out

Correct Answer
B. The pavement exerts an equal force in the opposite direction
Explanation
The pavement exerts an equal force in the opposite direction. This is known as the normal force, which is a contact force exerted by a surface to support the weight of an object resting on it. When you stand on the pavement, the pavement pushes back against you with an equal force, preventing you from falling through. This is why you don't fall through the pavement even though gravity pulls you towards the center of the Earth.

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• 7.

### Which gives the smallest reading on a forcemeter?

• A.

An apple suspended in water

• B.

An apple suspended in air

• C.

They both give the same reading

Correct Answer
A. An apple suspended in water
Explanation
When an object is suspended in water, it experiences an upward buoyant force equal to the weight of the water displaced by the object. This buoyant force reduces the effective weight of the apple, resulting in a smaller reading on the forcemeter compared to when the apple is suspended in air. Therefore, an apple suspended in water gives the smallest reading on a forcemeter.

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• 8.

### Which of these is not a force?

• A.

Friction

• B.

Weight

• C.

Height

Correct Answer
C. Height
Explanation
Friction and weight are both forces that act on objects. Friction is the force that opposes the motion of an object when it is in contact with another surface, while weight is the force exerted on an object due to gravity. However, height is not a force. Height is a measurement of distance and does not have the ability to exert a force on an object.

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• 9.

### Which of these is FALSE?

• A.

A moving object carries on moving until a force stops it

• B.

A moving object eventually runs out of force and slows down

• C.

A moving object travels in a line until a force changes its direction

Correct Answer
C. A moving object travels in a line until a force changes its direction
Explanation
This statement is false because a moving object does not necessarily travel in a straight line until a force changes its direction. In reality, a moving object can change its direction without the application of any external force, such as when it moves in a curved path due to inertia or gravitational forces. Therefore, the statement contradicts the concept of objects moving in curved paths without the need for external forces.

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• 10.

### When an object is at rest/stationary ...

• A.

There are no forces acting on it

• B.

There are forces acting on it but these forces are balanced

• C.

There is just one force acting on it, gravity

Correct Answer
B. There are forces acting on it but these forces are balanced
Explanation
When an object is at rest or stationary, it means that it is not moving. However, this does not mean that there are no forces acting on it. In fact, there can be forces acting on the object, but these forces are balanced. This means that the forces are equal in magnitude and opposite in direction, resulting in a net force of zero. As a result, the object remains at rest and does not move.

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Feb 10, 2009
Quiz Created by
Walder

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