mechanics

Question 1

What is the definition of displacement?

Answer 1

Displacement is the shortest distance from the initial to the final position of an object, along with the direction.

Question 2

True or False: Speed is a vector quantity.

Answer 2

False

Question 3

Fill in the blank: The unit of force in the SI system is __________.

Answer 3

Newton

Question 4

What is the formula for calculating acceleration?

Answer 4

Acceleration is calculated as the change in velocity divided by the time taken.

Question 5

Multiple Choice: Which of the following is not a type of friction? A) Static B) Kinetic C) Dynamic D) Gravitational

Answer 5

D) Gravitational

Question 6

What does Newton’s first law of motion state?

Answer 6

An object at rest stays at rest, and an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Question 7

True or False: Mass is a measure of the amount of matter in an object.

Answer 7

True

Question 8

What is the formula for calculating work done?

Answer 8

Work done is calculated as the force applied multiplied by the distance moved in the direction of the force.

Question 9

Fill in the blank: The law of conservation of energy states that energy cannot be created or __________.

Answer 9

destroyed

Question 10

Multiple Choice: Which quantity is measured in Joules? A) Force B) Work C) Power D) Energy

Answer 10

B) Work

Question 11

What is the principle of moments?

Answer 11

The principle of moments states that for an object in equilibrium, the sum of clockwise moments about a point is equal to the sum of anti-clockwise moments about that same point.

Question 12

True or False: The acceleration due to gravity on Earth is approximately 9.81 m/s².

Answer 12

True

Question 13

What is the difference between scalar and vector quantities?

Answer 13

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

Question 14

Fill in the blank: The momentum of an object is the product of its mass and __________.

Answer 14

velocity

Question 15

Multiple Choice: What is the unit of power? A) Joule B) Newton C) Watt D) Pascal

Answer 15

C) Watt

Question 16

What is the formula for calculating momentum?

Answer 16

Momentum is calculated as the mass of an object multiplied by its velocity.

Question 17

True or False: A body in uniform circular motion experiences an acceleration towards the center of the circle.

Answer 17

True

Question 18

What is the formula for gravitational potential energy?

Answer 18

Gravitational potential energy is calculated as mass multiplied by gravitational field strength and height (PE = mgh).

Question 19

Fill in the blank: The term ‘work-energy principle’ states that the work done on an object is equal to the __________ in its kinetic energy.

Answer 19

change

Question 20

Multiple Choice: Which of the following is a non-contact force? A) Tension B) Friction C) Gravitational D) Normal

Answer 20

C) Gravitational

Question 21

What is the definition of a resultant force?

Answer 21

The resultant force is the single force that has the same effect as all the individual forces acting on an object.

Question 22

True or False: An object in free fall only experiences gravitational force.

Answer 22

True

Question 23

What is the formula for calculating the range of a projectile launched at an angle?

Answer 23

Range = (v^2 * sin(2θ)) / g, where v is the initial velocity, θ is the launch angle, and g is the acceleration due to gravity.

Question 24

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

Answer 24

displacement

Question 25

Multiple Choice: Which of the following describes the motion of a pendulum? A) Uniform motion B) Simple harmonic motion C) Linear motion D) Circular motion

Answer 25

B) Simple harmonic motion

Question 26

What is the formula for calculating force?

Answer 26

Force = mass × acceleration (F = ma)

Question 27

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

Answer 27

True

Question 28

Fill in the blank: The unit of work in the SI system is _____.

Answer 28

Joule

Question 29

What is the principle of conservation of momentum?

Answer 29

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

Question 30

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

Answer 30

C) Velocity

Question 31

What is the acceleration due to gravity on Earth?

Answer 31

Approximately 9.81 m/s²

Question 32

Define kinetic energy.

Answer 32

Kinetic energy is the energy an object possesses due to its motion, calculated as KE = 1/2 mv².

Question 33

True or False: Work done is zero when the force is perpendicular to the direction of motion.

Answer 33

True

Question 34

What is the formula for potential energy?

Answer 34

Potential energy = mass × gravitational field strength × height (PE = mgh)

Question 35

Multiple Choice: Which law states that for every action there is an equal and opposite reaction? A) Newton's First Law B) Newton's Second Law C) Newton's Third Law D) Law of Conservation of Energy

Answer 35

C) Newton's Third Law

Question 36

What is the formula for calculating momentum?

Answer 36

Momentum = mass × velocity (p = mv)

Question 37

Fill in the blank: The measure of the inertia of an object is its _____.

Answer 37

mass

Question 38

What is the definition of torque?

Answer 38

Torque is a measure of the rotational force applied to an object, calculated as τ = r × F.

Question 39

True or False: A heavier object will always fall faster than a lighter object in a vacuum.

Answer 39

False

Question 40

What is the relationship between frequency and period in oscillatory motion?

Answer 40

Frequency is the reciprocal of period (f = 1/T).

Question 41

Multiple Choice: In simple harmonic motion, the restoring force is proportional to A) Displacement B) Velocity C) Acceleration D) Time

Answer 41

A) Displacement

Question 42

What is the formula for calculating the centripetal force required to keep an object moving in a circular path?

Answer 42

Centripetal Force = (mass × velocity²) / radius (Fc = mv²/r)

Question 43

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

Answer 43

displacement

Question 44

What is a scalar quantity? Give an example.

Answer 44

A scalar quantity has magnitude only; for example, temperature.

Question 45

True or False: Energy can be created and destroyed according to the law of conservation of energy.

Answer 45

False

Question 46

What is the formula for Hooke's Law?

Answer 46

F = -kx, where F is the force, k is the spring constant, and x is the displacement.

Question 47

Multiple Choice: What type of energy is stored in a compressed spring? A) Kinetic Energy B) Potential Energy C) Thermal Energy D) Electrical Energy

Answer 47

B) Potential Energy

Question 48

Define equilibrium in mechanics.

Answer 48

Equilibrium occurs when the net force and net torque acting on a body are both zero.

Question 49

What does the term 'free body diagram' refer to?

Answer 49

A free body diagram is a graphical representation of all the forces acting on an object.

Question 50

True or False: Inelastic collisions conserve kinetic energy.

Answer 50

False

Question 51

What is the formula for calculating the work done by a constant force?

Answer 51

Work = force × displacement × cos(θ)