Further mechanics

Question 1

What is angular speed

Answer 1

The angle an object rotates through per second

Question 2

What is simple harmonic motion

Answer 2

When acceleration is directly proportional to the displacement but in the opposite direction

Question 3

In circular motion which way is the force

Answer 3

Towards the centre

Question 4

When is ek max in simple harmonic motion

Answer 4

At the equilibrium point

Question 5

What is the name for the sum of kinetic and potential energy

Answer 5

Mechanical energy

Question 6

What is he graph of displacement-time

Answer 6

The cosine graph which a maximum value of amplitude

Question 7

What’s the graph of velocity-time

Answer 7

-sine graph with a maximum value of wA

Question 8

What is resonance

Answer 8

When an object is forced to vibrate at its natural frequency by a periodic input force

Question 9

What are forced vibrations

Answer 9

An object is forced to vibrate at a particular frequency by a periodic input force

Question 10

What does damping do

Answer 10

Reduces the amplitude and the natural frequency.

Question 11

What is damping

Answer 11

The dissipation of energy

Question 12

What are free vibrations

Answer 12

An oscillation where the total energy remains constant over time, therefore the amplitude will stay constant

Question 13

What is critical damping

Answer 13

When the amplitude is reduced to 0 in the minimum time possible

Question 14

What is mechanical energy

Answer 14

The sum of kinetic and potential energy

Question 15

Does amplitude affect frequency and time period

Answer 15

No

Question 16

What’s a forced vibration

Answer 16

When an object is forced to vibrate at a particular frequency by a periodic input force

Question 17

When will a forced vibration be in phase

Answer 17

If the driving frequency is less than the resonant frequency

Question 18

What happens if the driving force frequency is higher than the resonant frequency

Answer 18

They will become out of phase as the oscillator won’t be able to keep up

Question 19

How should you find the time period for one oscillation

Answer 19

Measure the time for at least several oscillations and then take an average

Question 20

What is damping used for

Answer 20

The reduce the effect of resonance, on structure and in sound proof rooms

Question 21

Give an example of a system which uses critical damping

Answer 21

Car suspension system

Question 22

When is acceleration maximum

Answer 22

At the maximum displacement

Question 23

What apparatus should you use when measuring oscillations

Answer 23

A fiducial marker

Question 24

What are examples of centripetal forces

Answer 24

Tension 
Gravity 
Support force
Magnetic force 
Friction

Question 25

Why do corners of roads have banked edges

Answer 25

To enable the vehicle to drive at a higher speed without skipping

Question 26

How do banked edges work

Answer 26

There is additional centripetal force caused by the horizontal component of the support force

Question 27

What is a free oscillation

Answer 27

Oscillations with constant amplitude and the total energy remains the same as there are no resistive forces

Question 28

What is damping

Answer 28

Reducing energy in a system as energy is dissipated in the surrounding as the spring does work to over come the friction

Question 29

What is the difference between light and heavy damping

Answer 29

Heavy damping occurs a lot quicker

Question 30

What is critical damping

Answer 30

Reducing the amplitude to 0 is the fastest time possible

Question 31

What is over damping

Answer 31

When you increase the time that the amplitude takes to reach 0

Question 32

What is a use of critical damping

Answer 32

Car suspension systems