2019 Paper 1

Question 1

Remember angular f is omega! Not f !

Answer 1

Don’t lack

Question 2

Remember when using gpe to ke idas to find final v , what to take into account

Answer 2

Must do chnage in gpe

Question 3

Remember young modulus is stress over STRAIN AS A NUMBER NOT A

Answer 3

Percentage! So if it is given as a percentage then divide by 100

Question 4

When doing stress, it’s the force over what area?

Answer 4

The cross sectional area, not the surface area dw

Question 5

How to ensure the cross sectional are is constant what Device use (2 marks)

Answer 5

Micrometer, measure cross sectional area by checking DIAMETER along the length of the tube to ensure it’s uncork

Question 6

What is the FULL DEFINITION OF work done

So when we say why does area represent work done how to say it

Answer 6

Work done = AVERAGE FORCE x distance

So area = average firce x distance thus work done

Question 7

When SHM happens and dampening occurs, say to air, what happens to energy of system total energy

Specify where this energy transfered too

Answer 7

Normally total energy conserved, now total energy decreases and THERMAL ENERGY OF AIR INCREASES

Question 8

DINT FORGET NOW

AMPLITUDE VS FREQUENCY OF DRIVER GRAPH

Answer 8

Amplitude starts from A PLACE and as it approaches f0 it RISES TO A MAX ! Then declines and APPROACHES ZERO

Question 9

Amplitude vs frequency graph when damped?

What happens to the peak !!!

2 points IMPORTANT

Answer 9

Thr amoltiude is just less than every point
- the peak frequency occurs at a SLIGHTLY LESS FUNDAMENTAL FREQUENCY THAN BEFORE
SO SHIFTS TO THE LEFT!!,