Topic 2 - Mechanics

Question 1

What is the formula for calculating force?

Answer 1

Force = mass × acceleration (F = ma)

Question 2

True or False: An object at rest will remain at rest unless acted upon by a net external force.

Answer 2

True

Question 3

What is the unit of mass in the SI system?

Answer 3

Kilogram (kg)

Question 4

Fill in the blank: The acceleration due to gravity on Earth is approximately ___ m/s².

Answer 4

9.81

Question 5

What is the principle of conservation of momentum?

Answer 5

The total momentum of a closed system remains constant if no external forces act on it.

Question 6

What does Newton’s second law state?

Answer 6

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

Question 7

Calculate the weight of a 10 kg object on Earth.

Answer 7

Weight = mass × gravity = 10 kg × 9.81 m/s² = 98.1 N

Question 8

What is the difference between scalar and vector quantities?

Answer 8

Scalar quantities have only magnitude, while vector quantities have both magnitude and direction.

Question 9

Multiple Choice: Which of the following is a vector quantity? A) Speed B) Distance C) Velocity D) Mass

Answer 9

C) Velocity

Question 10

What is the formula for kinetic energy?

Answer 10

Kinetic Energy = 0.5 × mass × velocity² (KE = 0.5mv²)

Question 11

True or False: Work done is a scalar quantity.

Answer 11

True

Question 12

What is the formula for potential energy?

Answer 12

Potential Energy = mass × gravity × height (PE = mgh)

Question 13

Fill in the blank: The law of inertia is associated with Newton’s ___ law.

Answer 13

First

Question 14

What is the definition of friction?

Answer 14

Friction is the resistance to motion of one object moving relative to another.

Question 15

What is the coefficient of friction?

Answer 15

A dimensionless number that represents the frictional force between two surfaces divided by the normal force.

Question 16

Multiple Choice: Which type of friction acts on objects at rest? A) Kinetic B) Static C) Rolling D) Fluid

Answer 16

B) Static

Question 17

What is the formula for calculating momentum?

Answer 17

Momentum = mass × velocity (p = mv)

Question 18

True or False: An object in free fall experiences both weight and air resistance.

Answer 18

True

Question 19

What is the term for the rate of change of velocity?

Answer 19

Acceleration

Question 20

Fill in the blank: The area under a velocity-time graph represents ___.

Answer 20

Displacement

Question 21

What does the term ‘net force’ mean?

Answer 21

The vector sum of all the forces acting on an object.

Question 22

Multiple Choice: Which of the following is not a type of energy? A) Kinetic B) Potential C) Thermal D) Magnetic

Answer 22

D) Magnetic

Question 23

What is the relationship between work and energy?

Answer 23

Work done on an object results in a change in energy of that object.

Question 24

True or False: Energy can be created or destroyed.

Answer 24

False

Question 25

What is the formula for gravitational force between two masses?

Answer 25

F = G(m₁m₂/r²)

Question 26

What is the meaning of terminal velocity?

Answer 26

The constant speed reached by an object when the force of gravity is balanced by the drag force.