Chapter 11

Question 1

What is Simple Harmonic Motion?

Answer 1

An oscillation in which the restoring force on an object is directly proportional to its displacement from the midpoint, and is directed towards the midpoint.

Question 2

Does the frequency and period of a pendulum depend on the amplitude of the pendulum?

Answer 2

No, they are independent of the amplitude. e.g. A pendulum clock will keep ticking in regular time intervals even if its swing becomes very small.

Question 3

Frequency=

Answer 3

1/T

Question 4

Force exerted on a spring=

Answer 4

kx

Question 5

Elastic strain energy=

Answer 5

1/2kx²

Question 6

π/2=

Answer 6

90°

Question 7

π=

Answer 7

180°

Question 8

π/4=

Answer 8

45°

Question 9

2π

Answer 9

360°

Question 10

Angular Velocity=

Answer 10

θ(in rad)/t

Question 11

Centripetal Acceleration(with linear velocity)=

Answer 11

v²(linear velocity)/r

Question 12

Centripetal Acceleration(with angular velocity)=

Answer 12

ω²(angular velocity) x r

Question 13

When does resonance happen?

Answer 13

When Driving Force=Natural Frequency

Question 14

When does Damping happen?

Answer 14

When energy is lost to the surroundings.

Question 15

What is Critical Damping?

Answer 15

It reduces the amplitude in the shortest possible time.