[OCR] 1
Topic: Atomic Structure
Particle A of mass $9 m$ and particle $B$ of mass $m$ travel towards each other along a smooth horizontal surface in a straight line and collide head-on. The initial speed of particle A before the collision is $u$.\n\nIn Fig. 1.1, the variation with time $t$ of momentum $p$ is shown from $t=0$ to $t=3 T$ for particle $A$ and from $t=0$ to $t=T$ for particle $B$.\n
\nFig. 1.1
[9.0m]
Part 1: (a) (i) On Fig. 1.1, draw the variation with $t$ of $p$ from $t=T$ to $t=3 T$ for particle $B. [1m]
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Part 2: (ii) Explain how the principle of conservation of momentum is used to complete the graph in (a)(i).\n$\qquad$\n$\qquad$\n$\qquad$\n$\qquad$\n$\qquad$ [2m]
Part 3: (b) Explain, with appropriate working, whether the collision between particles $A$ and $B$ is elastic.\n$\qquad$\n$\qquad$\n$\qquad$ [3m]
Part 4: (c) Using Fig. 1.1, explain how the graphs are consistent with Newton's third law of motion during the collision. [3m]
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