QUESTIONSHEET 1

(a) skis spread force over larger area than boots 1

(b) (i) pressure = force / area 1 1

500 N / 0.2 m² ´ 2 1 1

= 1250 Pa/Pascal/Nm^-2 1 1

(ii) 500N / 0.05 m² ´ 2 1 1

= 5000 Pa/Pascal/Nm^-2 1 1

(iii) area = force / pressure 1 1

600 N / 1250 Pa 1 1

= 0.48 m² /2 1 1

= 0.24 m² 1 1

TOTAL / 10

QUESTIONSHEET 2

(a) Any three from:

road surface condition

tyre condition

brake condition

reaction time

speed of bicycle 3 3

(b) (i) bigger, so greater mass 1 1

(ii) deceleration = change in speed / time 1

-10 ms^-1 / 2.5 s 1 1

= - 4 ms^-2 (accept 4 ms^‑2) 1 1

TOTAL / 7

QUESTIONSHEET 3

(a) None/no forces acting 1 1

(b) gets faster/speeds up/velocity increases 1

force backwards produces equal and opposite force forwards/

force one way produces equal force in opposite direction 1

1

(c) acceleration = force / mass 1 1

20 000 / 1000 1 1

= 20 ms^-2 / 0.02 kms^-2 1 1

(d) acceleration = change in velocity / time 1

20 ms^-2 ´ 10 s 1 1

change in velocity = 200 ms^-1 1 1

final velocity = 2200 ms^-1 1 1

TOTAL / 10

QUESTIONSHEET 4

(a) 250 Pa ´ 55 m³ / 50 m³ 1 1

= 275 Pa/Nm^-2 1 1

(b) (i) 15

10

8 3 3

(ii) the volume decreases/reduces/goes down

(NOT is less, is smaller) 1 1

(c) One from:

bicycle tyres/car tyres/life jackets/dinghies/air bags in cars 1

TOTAL / 7

QUESTIONSHEET 5

(a) arrow directly downwards labelled gravity 1

arrow directly upwards labelled air resistance 1

(b) (i) Sweet 1 1

air resistance greater for paper than sweet 1

(ii) force = mass ´ acceleration 1 1

0.01 kg ´ 10 ms^-2 / 1000 1 1

= 0.1 N 1 1

(c) (i) both fall to ground 1 1

hit ground at same time 1 1

(ii) no atmosphere to exert force/no air resistance/

no air to exert force 1 1

TOTAL / 10

QUESTIONSHEET 6

(a) (i) It goes up/rises 1 1

(ii) force is transmitted by/passed through liquid 1

(b) (i) pressure = force / area 1 1

2000 N / 0.001 m²

or 2 kN / 0.001m² 1 1

= 2000 kPa/2 000 000 Pa (or Nm^-2 ) 1 1

TOTAL / 5

QUESTIONSHEET 7

(a) equal and opposite/balanced 1 1

(b) 50 N 1 1

towards team X 1 1

(c) 750 N 1 1

towards team Y 1 1

(d) acceleration = force / mass 1 1

800 N / 200 kg 1 1

= 4 ms^-2 towards team X 1

TOTAL / 9

QUESTIONSHEET 8

(a) weight is the force that gravity exerts on an object 1

mass measures the amount of matter in a body 1

(b) (i) Newton 1 1

(ii) 55 ´ 10 1 1

= 550 N 1 1

(iii) W = m ´ g

so m = W / g 1 1

0.001 / 10 1 1

= 0.0001 g 1 1

TOTAL / 8

QUESTIONSHEET 9

(a) Alice 1 1

(b) (i) average speed/(speed) = distance / time 1

200 m / 30 s 1 1

= 6.67 m^-2 1 1

(ii) time = distance / speed/average speed 1 1

300 m / 6.67 m^-2 1 1

= 44.9 / 45 s 1 1

(c) Direction of motion 1 1

TOTAL / 8

QUESTIONSHEET 10

(a) (i)

all points correctly plotted 2 2

points joined with line 1 1

(ii) 8 ms^-1 1 1

(b) acceleration = change in speed / time 1 1

5 ms^-1 / 50 s 1 1

= 0.1 ms^-2 1 1

(c) the forces are balanced/no resultant force/

equal and opposite 1 1

TOTAL / 8

QUESTIONSHEET 11

(a) 23.5 N 1 1

(b) (i)

points plotted correctly 1 2

best fit line 1 1

(ii) 1.6 kg 1 1

(iii) elastic limit has been reached/exceeded/

spring stretched beyond elastic limit 1 1

spring will not return to original length 1

(iv) between 18 N and 19.5 N 1 1

TOTAL / 8

QUESTIONSHEET 12

effort

(a) (i)

pivot

effort

	pivot
		load
load

½ mark for each correct label, round to integer 3

(ii) wheelbarrow – load and effort on same side of pivot 1

scissors – load & effort on opposite sides of pivot 1

(b) less effort applied to do same work 1 1

more movement of screwdriver 1 1

(c) 10 ´25 = 250 1 1

250 / 100 1 1

= 2.5 N 1 1

TOTAL / 10

QUESTIONSHEET 13

(a) B, C, A 1 1

less likely to topple if greater mass at base 1 1

(b) (i) contains weight in base 1 1

(ii) point through which weight acts 1 1

producing a balance point 1 1

(c) suspend plywood 1 1

hang a weight from suspension point 1 1

marks position of string 1 1

repeat with new position 1 1

where lines cross is balance point 1 1

TOTAL / 10

QUESTIONSHEET 14

(a) (i) spread mass over larger area 1 1

less pressure on roof 1 1

(ii) spread mass over larger area 1 1

less likely to sink in soft snow 1 1

(iii) sharp knife has smaller surface area on cutting edge 1

more pressure applied 1 1

(b) 600 / 2 = 300 N each foot. 1

= 300 / (0.01)² 1

= 3 000 000 N / m² 1

= 3000 kN/m² 1

TOTAL / 9

QUESTIONSHEET 15

(a) LHS – 400 ´ 2 = 800 1 1

RHS – 300 ´ 2 = 600 1 1

difference = 200 1 1

position = 250 / 200 1 1

Þ 1.25 m from pivot on Dick’s side 1 1

(b) (i)

	80
	70
		20
	10

0

40

30

20

10

Extension / m

sensible scales 1 1

labelled axes 1 1

correct plotting 2 2

(ii) 20 m 1 1

(iii) 27 tonnes 1 1

TOTAL / 11

QUESTIONSHEET 16

(a) (i) -10 N 1 1

(ii) 0 N 1 1

(iii) + 100 N 1 1

(b) (i) 500 000 + 250 000 1 1

= 750 000 N 1 1

(ii) the exact angles 1 1

(iii) use the angles & forces to a scale 1 1

to draw triangle 1 1

measure side in direction of boat 1 1

TOTAL / 9

QUESTIONSHEET 17

(a) Stretches evenly 1 1

returns to original length 1 1

(b) (i) 12 cm 1 1

(ii) 8.5 cm 1 1

(c) yes 1 1

it is no longer stretching uniformly/evenly 1 1

(d) 50 N balance 1

TOTAL / 7

QUESTIONSHEET 18

(a) (i) useful 1 1

(ii) nuisance 1 1

(iii) nuisance 1 1

(iv) useful 1 1

(v) useful 1 1

(b) floats on air cushion 1 1

no contact with sea 1 1

TOTAL / 7

QUESTIONSHEET 19

(a) (i) draw has mass 1 1

work done to move it 1 1

(ii) you have mass 1 1

work done to lift you 1 1

(b) climb flight of stairs 1 1

larger mass moved 1 1

through greater distance 1 1

TOTAL / 7

QUESTIONSHEET 20

One mark for each word/phrase

push

pull

friction

slowly

magnetic

tension

electrical / electrostatic

gravity

float

rise 10

TOTAL / 10