Physics · Oct / Nov 2022 · Paper 41 · Question 1
0625
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The question as text
Two blocks, A and B, are joined by a thin thread that passes over a frictionless pulley. Block A is at rest on a rough horizontal surface and block B is held at rest, just below the pulley. Fig. 1.1 shows the thread hanging loose. block A rough horizontal surface pulley thread block B Fig. 1.1 (not to scale) Block B is released and it falls vertically. The thread remains loose until block B has fallen a distance of 0.45 m. The mass of block B is 0.50 kg.
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1(a)[2]
2.3 J
Δg.p.e. = mgΔh in any form or 0.50 × 10 × 0.45
1(b)(i)[3]
1.2 N s
impulse = change in momentum or 2.0 × 0.60
I = mΔv in any form or 2.0 × 0.60
1(b)(ii)[3]
kinetic energy (of block A) decreases
thermal / internal energy produced / increases (due to friction)
friction mentioned or block slows down / decelerates
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