Physics (AS & A Level) · May / June 2016 · Paper 23 · Question 3
9702
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3(a)[2]
(gravitational potential energy is) the energy/ability to do work of a mass that it has or is stored due to its position/height in a gravitational field kinetic energy is energy/ability to do work a object/body/mass has due to its speed/velocity/motion/movement [2]
3(b)(i)[3]
s = [(u + v) t] / 2 or acceleration = 9.8/9.75 (using gradient) = [(7.8 + 3.9) × 0.4] / 2 or s = 3.9 × 0.4 + 1 2 × 9.75 × (0.4) 2 s = 2.3(4) m [3]
3(b)(ii)[2]
a = (v – u) / t or gradient of line = (7.8 – 3.9) / 0.4 = 9.8 (9.75) m s–2 (allow ± 1 2 small square in readings) [2]
3(b)(iii)[3]
KE = 1 2 mv2 change in kinetic energy = 1 2 mv2 – 1 2 mu2 = 1 2 × 1.5 × (7.82 – 3.92) = 34 (34.22) J [3]
3(c)[2]
work done = force × distance (moved) or Fd or Fx or mgh or mgd or mgx = 1.5 × 9.8 × 2.3 = 34 (33.8) J (equals the change in KE) [2]
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