QUESTIONSHEET 1

 

(a) work done = force distance moved 1 1

50 10 2.5 1 1

= 1250 J/Joules 1 1

 

(b) (i) Mike 1750 1 1

Jeff 1500 1 1

 

(ii) Jeff 1 1

 

(iii) Mike 1 1

 

(c) force = work done

distance moved 1 1

1750 / 2 = 875N 1 1

875 / 10 1 1

87.5 kg 1 1

 

(Marks will be awarded for the calculation even if the work done by Mike was wrongly calculated in b(i))

 

TOTAL / 11

 

 

QUESTIONSHEET 2

 

(a) work done = force distance moved 1 1

650 500 1 1 = 325 kJ/325,000 J 1

= 325 KJ/ 325,000 J 1

 

(b) 500 500 = 25 000 J 1 1

250 000 / 2000 1 1

= 125 W/watts 1 1

 

(c) 650 500 = 325 000 J 1 1

325 000 / 5000 1 1

= 65 W/watts 1 1

125 65 = 60 W/watts 1 1

 

Note: Do not deduct further marks if incorrect answer from b) is used correctly in subsequent calculations.

 

TOTAL / 10


 

 

QUESTIONSHEET 3

 

(a) (i) converted to/becomes/changes to kinetic energy. 1

 

(ii) 1 x 45 1 1

= 45 kJ/45,000 J 1 1

(b) velocity = 1

1000 / 10 = 100 kg 1

v = 1

= 30 ms-1 1 1

 

(c) work done = gain in potential energy 1 1

= 45 kJ/45,000 J 1 1

 

TOTAL / 9

 

 

QUESTIONSHEET 4

 

(a) 120 10 1 1

= 1200 J/1.2 kJ 1 1

(b) 120 5 1 1

= 600 J 1 1

 

(c) (i) 600 100 1

1200

= 50% 1 1

 

(ii) friction in wheels 1 1

 

(iii) oil wheels 1 1

 

TOTAL / 8


 

 

QUESTIONSHEET 5

 

(a) energy efficient bulb: 20 / 21 100 1 1

= 95% 1 1

 

standard bulb: 100 / 180 100 1 1

= 20% 1 1

 

fluorescent strip: 20 / 28 100 1 1

= 60% 1 1

 

(b) (i) standard bulb 1 1

 

(ii) lost as heat 1 1

 

(c) use less electricity for the same light output 1 1

last longer so less resources used in a given time 1

 

TOTAL / 10

 

 

QUESTIONSHEET 6

 

(a) KE = m v2 1 1

= 5000 32 1 1

= 22500 J 1 1

 

(b) 3 / 5 1 1

= 0.6 m/s 1 1

 

(c) 25 000 0.62 1 1

= 4500 J 1 1

 

(d) (i) 22 500 - 4 500 = 18 000 J 1 1

 

(ii) converted to heat 1 1

and sound 1 1

 

TOTAL / 10


 

 

QUESTIONSHEET 7

 

(a) Watts 1 1

 

(b) one Watt = one Joule per second 1 1

 

(c) energy = force distance 1 1

= 80 10 30 1 1

= 24 000 J 1 1

 

(d) Power = energy / time 1 1

= 24 000 / 15 1 1

= 1600 W or 1.6 kW 1 1

 

TOTAL / 8

 

 

QUESTIONSHEET 8

 

(a) 55 10 = 550 N 1 1

 

(b) (i) energy = force distance 1 1

= 3.5 550 1 1

= 1925 J 1 1

 

(ii) 1925 J 1 1

 

(c) v2 = u2 + 2as 1 1

0 = 122 + 2 -10 x s 1 1

s = 144 / 20 1 1

= 7.2 m 1 1

 

(d) 900 / 3 1 1

= 300 W 1 1

 

TOTAL / 11

 

 

QUESTIONSHEET 9

 

(a) (i) 30 10 3 1 1

= 900 J/joules 1 1

 

(b) 900 J/joules 1 1

(c) (1) muscles of the man/food man has eaten/

chemical energy in food 1 1

 

(2) lift motor 1 1

 

TOTAL / 5

 

 

 

QUESTIONSHEET 10

 

(a) (i) 600 kJ/600,000 J 1 1

 

(ii) 3.6 MJ/3,600 kJ 1 1

 

(b) energy of light bulb = 1 500 000 W 1 1

time = energy transferred / power 1 1

4 h 10 min/250 min 1 1

 

(c) (i) electrical to heat energy 1 1

 

(ii) electrical to heat and light energy 1 1

 

(iii) electrical to heat and movement/kinetic energy 1

 

TOTAL / 8

 

 

QUESTIONSHEET 11

 

(a) (i) potential energy to kinetic energy 1 1

 

(ii) kinetic energy to sound and kinetic energy 1 1

 

(iii) kinetic energy to potential energy 1 1

 

(b) (i) 300 / 1000 10 1 1

= 0.3 1.8 1 1

= 0.54 J 1 1

 

(ii) potential energy has become kinetic energy at the instant

it hits the ground 1 1 = SQRT (o.54 / 0.5 x 0.3) 1

= 1

= 6 ms-1 1 1

 

TOTAL / 9


 

 

QUESTIONSHEET 12

 

(a) using work done = force distance moved 1 1

430 4/4 = 430 W (Lucy) 1 1

450 4/6 = 300 W (Carol) 1 1

 

(b) Lucy 1 1

 

(c) her muscles 1 1

 

(d) Carol 1 1

She would do the most work as she was the heaviest/ had greatest weight 1 1

 

TOTAL / 7

 

 

QUESTIONSHEET 13

 

(a) supplied as part of nature/generated in a way that the Earths resources not used up. 1 1

 

(b) (i) 200 1 1

 

(ii) Wind does not blow all the time. 1 1

(c) (i) rearranging equation 1 1

5 3300 60 1 1

= 990,000 M J 1 1

 

(ii) 495,000 MJ 1 1

 

TOTAL / 7

 

 

QUESTIONSHEET 14

 

(a) Joule 1 1

 

(b) (i) energy = force distance 1 1

0.3 10 0.5 1 1

1.5 J 1 1

 

(ii) 1.5 J 1 1

 

(iii) 0.3 10 1 1

3 N 1 1

 

TOTAL / 7

 

 

 

 

 

 

QUESTIONSHEET 15

 

(a) (i) No loss of kinetic energy 1 1

 

(ii) lose energy as heat 1 1

and sound 1 1

 

(b) (Two from)

air bag - absorbs kinetic energy of driver

crumple zone absorbs KE of car

seat belt exerts force to stop driver 4 4

(c) (i) KE = m v2 1 1

= 2000 152 1 1

= 225 000 J or 225 kJ 1 1

 

(ii) Force = energy / distance 1 1

= 225 000 / 30 1 1

= 7500 N 1 1

 

TOTAL / 13

 

 

QUESTIONSHEET 16

 

(a) (i) chemical 1 1

electrical 1 1

kinetic 1 1

 

(ii) work done = force x distance 1 1

= 3 1 = 3 J 1 1

 

(iii) Power = energy / time 1 1

= 3 / 10 = 0.3 W 1 1

 

(b) (i) potential 1 1

kinetic 1 1

electrical 1 1

heat & light 2 2

 

(ii) KE = m v2 1 1

= 1 22 1 1 = 2 J 1

 

(c) chemical 1 1

heat 1 1

kinetic 1 1

 

TOTAL / 17

 

 


 

 

QUESTIONSHEET 17

 

(a) heat and light (either order) 2 2

 

(b) chemical 1 1

sound 1 1

 

(c) kinetic and sound (either order) 2 2

 

(d) heat and light (either order) 2 2

 

TOTAL / 8

 

 

QUESTIONSHEET 18

 

(a) Six from

kinetic, potential, electrical, heat, light, sound,

chemical, nuclear 6 6

 

(b) (i) Newton 1 1

metre 1 1

 

(ii) conservation 1 1

changed 1 1

created 1 1

destroyed 1 1

 

TOTAL / 12


 

 

QUESTIONSHEET 19

 

 

(a) too much emphasis on nuclear energy 1 1

not enough spent on renewable sources 1 1

 

(b) secondary source of energy 1 1

made from the others 1 1

 

(c) gas 1 1

oil 1 1

 

TOTAL / 6

 

 

QUESTIONSHEET 20

 

(a) (i) the sun 1 1

 

(ii) photosynthesis 1 1

produces glucose / sugar which stores energy 1 1 converted to storable form 1

 

(iii) plants die 1 1

subjected to high temperatures and pressures 1 1

over millions of years 1 1

 

(b) (i) A 1 1

 

(ii) C 1 1

 

TOTAL / 8