Available practice: 43 of 80 marks. Parts 1(b), 1(c)(ii), 2(a)(i), 2(a)(ii), 3(b)(ii), 3(b)(iv), 4(b)(i), 5(b)(ii), 5(b)(iii), 6(b)(i), 6(b)(ii), 7(a), 7(b)(ii), 9(a), 9(b) await marking support. Scores cover available parts only.
A long tube contains oil. A small ball is held at rest at the surface of the oil. At time t = 0, the ball is released and begins to fall vertically through the oil. As the ball begins to fall through the oil, it accelerates.
(a)Define acceleration.
[1 mark]
A small ball is released at the surface of oil in a long tube at t = 0 and falls vertically through the oil. As the ball falls, its speed v is recorded.
Describe what happens to the acceleration between t = 0 and t = 0.040 s.
(c)(i)Explain why this happens.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
