Forces: Master the Fundamentals of Motion and Forces

Question 1

Which of the following is **not** a fundamental force in the context of physics?

Accepted Answer

Centrifugal force

Answer

Gravitational force

Answer

Electromagnetic force

Answer

Nuclear force

Question 2

According to Newton's first law of motion, what happens to an object at rest?

Accepted Answer

It will remain at rest unless acted upon by an external force

Answer

It will move with a constant velocity

Question 3

What is the SI unit for measuring force?

Accepted Answer

Newton

Answer

Joule

Answer

Pascal

Answer

Watt

Question 4

When multiple forces act on an object, the resultant force is determined by:

Accepted Answer

The vector sum of all the forces

Answer

The average of all the forces

Answer

The strongest of all the forces

Answer

The weakest of all the forces

Question 5

An object is considered to be in equilibrium when:

Accepted Answer

The net force acting on it is zero

Answer

The net torque acting on it is zero

Answer

The sum of all forces acting on it is maximum

Answer

The object is moving at a constant speed

Question 6

The weight of an object is:

Accepted Answer

The force of gravity acting on it

Answer

The mass of the object

Answer

The acceleration due to gravity

Answer

The momentum of the object

Question 7

According to Newton's second law of motion, the acceleration of an object is directly proportional to its:

Accepted Answer

Force acting on it

Answer

Mass

Answer

Velocity

Answer

Momentum

Question 8

Which of the following is a vector quantity?

Accepted Answer

Force

Answer

Mass

Answer

Temperature

Answer

Power

Question 9

A vehicle travels at a constant velocity of 10 m/s. If the frictional coefficient between its tires and the road is 0.2, what is the maximum frictional force acting on the vehicle?

Accepted Answer

20 N

Answer

10 N

Answer

50 N

Answer

100 N

Question 10

A lever, as a simple machine, primarily amplifies:

Accepted Answer

Force

Answer

Distance

Answer

Power

Answer

Energy

Question 11

In the International System of Units (SI), the unit for measuring force is the:

Accepted Answer

Newton (N)

Answer

Joule (J)

Answer

Watt (W)

Answer

Kilogram (kg)

Question 12

An object is said to be in equilibrium when the net force acting on it is:

Accepted Answer

Zero

Answer

Non-zero

Answer

Equal to the weight of the object

Answer

Equal to the mass of the object

Question 13

Which of the following is NOT a factor that affects the weight of an object?

Accepted Answer

Volume

Answer

Mass

Answer

Acceleration due to gravity

Answer

Location

Question 14

A car is traveling at a constant speed of 20 meters per second. What is the net force acting on the car?

Accepted Answer

Zero

Answer

20 Newtons

Answer

40 Newtons

Answer

80 Newtons

Question 15

Which of the following is a unit of force?

Accepted Answer

Newton

Answer

Joule

Answer

Watt

Answer

Pascal

Question 16

Which of the following statements about Newton's Second Law of Motion is not true?

Accepted Answer

The mass of an object is inversely proportional to its acceleration.

Answer

The acceleration of an object is directly proportional to the net force acting on it.

Answer

The net force acting on an object is equal to the rate of change of its momentum.

Answer

Newton's Second Law of Motion can be used to predict the movement of an object.

Question 17

Calculate the weight of an object with a mass of 20 kg. (Acceleration due to gravity: 9.8 m/s²)

Accepted Answer

196 N

Answer

98 N

Answer

49 N

Answer

20 N

Question 18

Which forces act on an object resting on a horizontal surface?

Accepted Answer

Gravitational force and normal contact force

Answer

Gravitational force only

Answer

Normal contact force only

Answer

No forces

Question 19

An object moves with a constant velocity. What is the net force acting on the object?

Accepted Answer

Zero

Answer

A force in the direction of motion

Answer

A force opposite to the direction of motion

Answer

Cannot be determined without more information

Question 20

The coefficient of friction between two surfaces is 0.6. What is the maximum angle of inclination at which an object will remain at rest on the surfaces?

Accepted Answer

31°

Answer

45°

Answer

60°

Answer

90°

Question 21

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. What does this mean?

Accepted Answer

The force applied to an object is equal to the force exerted by the object, and they act in opposite directions.

Answer

The force applied to an object is greater than the force exerted by the object.

Answer

The force applied to an object is less than the force exerted by the object.

Answer

The force applied to an object is perpendicular to the force exerted by the object.

Question 22

What is the SI unit of force?

Accepted Answer

Newton

Answer

Kilogram

Answer

Meter

Answer

Second

Question 23

A resultant force is the vector sum of all forces acting on an object. True or False?

Accepted Answer

True

Answer

False

Question 24

An object is in equilibrium when the net force acting on it is zero. True or False?

Accepted Answer

True

Answer

False

Question 25

The coefficient of restitution is a measure of what property of a material?

Accepted Answer

Elasticity

Answer

Friction

Answer

Momentum

Answer

Energy

Question 26

Which of the following is NOT a factor that affects the trajectory of a projectile?

Accepted Answer

Shape of the projectile

Answer

Initial velocity

Answer

Mass of the projectile

Answer

Drag force

Question 27

Which of the following is **not** a unit of force?

Accepted Answer

Kilogram

Answer

Newton

Answer

Pound

Answer

Pascal

Question 28

According to Newton's second law of motion, the acceleration of an object is:

Accepted Answer

Directly proportional to its mass and force

Answer

Inversely proportional to its mass and force

Answer

Independent of its mass and force

Answer

Equal to the force applied

Question 29

An object is said to be in equilibrium when:

Accepted Answer

The resultant force acting on it is zero

Answer

It is moving at a constant speed

Answer

It is accelerating

Answer

Its velocity is changing

Question 30

Friction is a force that:

Accepted Answer

Acts in the opposite direction of motion

Answer

Acts in the direction of motion

Answer

Increases the speed of an object

Answer

Does not affect the motion of an object

Question 31

Which of the following factors does **not** affect weight?

Accepted Answer

Volume

Answer

Mass

Answer

Gravitational field strength

Answer

Density

Question 32

Which of the following is a common application of Newton's third law of motion?

Accepted Answer

Rocket propulsion

Answer

Friction between surfaces

Answer

Weight of an object

Answer

Elasticity of a spring

Question 33

How can resultant forces influence an object's motion, considering both speed and direction?

Accepted Answer

Resultant forces impact both the speed and direction of an object.

Answer

Resultant forces solely affect an object's speed, not its direction.

Answer

Resultant forces solely affect an object's direction, not its speed.

Answer

Resultant forces have no effect on an object's motion.

Question 34

Provide a clear and concise definition of equilibrium as it applies to objects under the influence of multiple forces. Explain how this concept manifests in practical everyday scenarios.

Accepted Answer

Equilibrium occurs when the net force acting on an object is zero, resulting in no acceleration.

Answer

For an object to be in equilibrium, it must be subjected to precisely two equal and opposing forces.

Answer

Equilibrium exclusively applies to stationary objects that are not moving.

Answer

The principles of equilibrium have no practical significance in everyday life.

Question 35

An object is in equilibrium when:

Accepted Answer

The net force acting on it is zero

Answer

The object is accelerating

Answer

The object is moving with a constant velocity

Answer

The object is at rest

Question 36

Which of the following is a vector quantity?

Accepted Answer

Force

Answer

Speed

Answer

Mass

Answer

Time

Question 37

What is the SI unit of force?

Accepted Answer

Newton

Answer

Pascal

Answer

Joule

Question 38

Which of the following factors affect the weight of an object?

Accepted Answer

Mass and gravitational field strength

Answer

Mass only

Answer

Gravitational field strength only

Answer

Volume only

Question 39

What is the formula for calculating the frictional force?

Accepted Answer

F = μN

Answer

F = ma

Answer

F = mg

Answer

F = ½mv²

Question 40

A book resting on a table experiences a weight, or gravitational force, of 5 N. Determine the normal force acting on the book in response to its weight.

Accepted Answer

5 N

Answer

-5 N

Answer

0 N

Answer

10 N

Question 41

For an object to be in equilibrium, the net force acting upon it must be:

Accepted Answer

Zero

Answer

Positive

Answer

Infinite

Answer

Negative

Question 42

Define the momentum of an object:

Accepted Answer

Mass x Velocity

Answer

Distance / Time

Answer

Mass + Velocity

Answer

Force / Velocity

Question 43

In a collision, the total momentum of the system remains:

Accepted Answer

Constant

Answer

Positive

Answer

Zero

Answer

Negative

Question 44

Which physical quantity is measured in Newtons?

Accepted Answer

Force

Answer

Joule

Answer

Watt

Answer

Kilogram

Question 45

Which of the following is defined as a physical quantity that has only magnitude and no direction?

Accepted Answer

Mass

Answer

Velocity

Answer

Acceleration

Answer

Force

Question 46

What is the SI unit of force?

Accepted Answer

Newton

Answer

Pascal

Answer

Joule

Answer

Watt

Question 47

A body is considered to be in equilibrium when the resultant force acting on it is:

Accepted Answer

Zero

Answer

Constant

Answer

Maximum

Answer

Minimum

Question 48

Which of the following is a force that occurs when two surfaces are in contact?

Accepted Answer

Friction

Answer

Electrostatic force

Answer

Gravity

Answer

Magnetic force

Question 49

Which of the following is Newton's third law of motion?

Accepted Answer

For every action, there is an equal and opposite reaction

Answer

An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force

Answer

The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass

Question 50

A car of mass 1200 kg accelerates from rest to a speed of 20 m/s in 10 seconds. What is the average force acting on the car during this time?

Accepted Answer

2400 N

Answer

1200 N

Answer

120 N

Answer

240 N

Question 51

A 5 kg object is hanging from a spring scale. What is the reading on the scale?

Accepted Answer

49 N

Answer

5 N

Answer

50 N

Question 52

A box is pushed across a rough surface with a constant force. Which of the following statements is TRUE about the friction force acting on the box?

Accepted Answer

It acts in the opposite direction to the applied force.

Answer

It acts in the same direction as the applied force.

Answer

It is always equal to the applied force.

Question 53

A 10 kg object is pulled by two forces: 20 N to the right and 10 N to the left. What is the resultant force acting on the object?

Accepted Answer

10 N to the right

Answer

30 N to the right

Answer

10 N to the left

Answer

0 N

Question 54

A ball is thrown vertically upwards. What is the direction of the acceleration acting on the ball as it travels upwards?

Accepted Answer

Downwards

Answer

Upwards

Answer

It has no acceleration.

Answer

Horizontally

Question 55

A cyclist is travelling at a constant speed. Which of the following statements is TRUE about the forces acting on the cyclist?

Accepted Answer

The forces acting on the cyclist are balanced.

Answer

The forces acting on the cyclist are all equal in magnitude.

Answer

There is only one force acting on the cyclist.

Answer

The forces acting on the cyclist are unbalanced.

Question 56

A 500 g object is placed on a horizontal surface. The coefficient of static friction between the object and the surface is 0.4. What is the minimum force required to start the object moving?

Accepted Answer

1.96 N

Answer

0.4 N

Answer

19.6 N

Answer

5 N

Question 57

A car is travelling at 20 m/s and brakes to a stop in 5 seconds. What is the deceleration of the car?

Accepted Answer

4 m/s²

Answer

0.25 m/s²

Answer

100 m/s²

Answer

40 m/s²

Question 58

A ball is thrown horizontally from a cliff. Ignoring air resistance, which of the following statements is TRUE about the ball's motion?

Accepted Answer

The ball will fall at a constant acceleration due to gravity.

Answer

The ball will move horizontally at a constant velocity.

Answer

The ball will fall at a constant velocity.

Question 59

Two objects, one with a mass of 2 kg and the other with a mass of 4 kg, are connected by a light string. A force of 12 N is applied to the 4 kg object. What is the acceleration of the system?

Accepted Answer

2 m/s²

Answer

12 m/s²

Answer

6 m/s²

Answer

4 m/s²