Chapter 2 - Dynamics

Question 1

What is Newton’s first law of motion?

Answer 1

An object will remain at rest or in uniform motion unless acted upon by a resultant force.

Question 2

What is Newton’s second law of motion?

Answer 2

The resultant force acting on an object is proportional to the rate of change of its momentum.

Question 3

What is Newton’s third law of motion?

Answer 3

When objects interact, the force that acts on each object is equal in size and opposite in direction

Question 4

What is the formula for calculating force?

Answer 4

Force = mass x acceleration

Question 5

What is the SI unit for force?

Answer 5

Newton (N)

Question 6

What is the formula for calculating momentum?

Answer 6

Momentum = mass x velocity

Question 7

What is the principle of conservation of momentum?

Answer 7

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

Question 8

What is the formula for calculating impulse?

Answer 8

Impulse = force x time

Question 9

What is the principle of conservation of energy?

Answer 9

Energy cannot be created or destroyed, only transferred or transformed.

Question 10

What is the formula for calculating kinetic energy?

Answer 10

Kinetic energy = 0.5 x mass x velocity^2

Question 11

What is the formula for calculating potential energy?

Answer 11

Potential energy = mass x gravity x height

Question 12

What is the formula for calculating work done?

Answer 12

Work done = force x distance x cos(theta)

Question 13

What is the formula for calculating power?

Answer 13

Power = work done / time taken

Question 14

What is the unit for power?

Answer 14

Watt (W)

Question 15

What is the difference between static and kinetic friction?

Answer 15

Static friction prevents an object from moving, while kinetic friction opposes the motion of an object.

Question 16

What is the formula for calculating coefficient of friction?

Answer 16

Coefficient of friction = frictional force / normal reaction force

Question 17

What is the formula for calculating centripetal force?

Answer 17

Centripetal force = (mass x velocity^2) / radius

Question 18

What is the direction of centripetal force in circular motion?

Answer 18

Centripetal force acts towards the center of the circle.

Question 19

What is the formula for calculating angular velocity?

Answer 19

Angular velocity = 2 x pi x frequency

Question 20

What is the formula for calculating angular acceleration?

Answer 20

Angular acceleration = change in angular velocity / time taken

Question 21

What is the formula for calculating torque?

Answer 21

Torque = force x lever arm length x sin(theta)

Question 22

What is the principle of moments?

Answer 22

The sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about the same point.

Question 23

What is the formula for calculating pressure?

Answer 23

Pressure = force / area

Question 24

What is the SI unit for pressure?

Answer 24

Pascal (Pa)

Question 25

What is Pascal’s principle?

Answer 25

A change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container.

Question 26

What is Archimedes’ principle?

Answer 26

The buoyant force acting on an object immersed in a fluid is equal to the weight of the fluid displaced by the object.

Question 27

What is the formula for calculating density?

Answer 27

Density = mass / volume

Question 28

What is Hooke’s law?

Answer 28

The extension of a spring is directly proportional to the force applied, as long as the elastic limit is not exceeded.