A man weighing 80 kg is standing on a trolley weighing 400 kg

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A man weighing 80 kg on a 400 kg trolley is analyzed for his displacement after walking at 1 m/s for 4 seconds on a frictionless rail. The calculation involves understanding relative motion, leading to a total displacement of 4 m relative to the ground. Additionally, the discussion includes a second question about matching frictional forces between steel and teflon surfaces, requiring knowledge of coefficients of friction and mass calculations. Participants suggest re-posting the question in a more appropriate forum for homework help and encourage sharing initial attempts at solving the problems. Engaging in these discussions can enhance understanding of physics concepts related to motion and friction.
hims100
Hi all!

can somebody help me out in solving following 2 questions:

1. A man weighing 80 kg is standing on a trolley weighing 400 kg.The trolly is resting on a frictionless horizontal rail .If the man starts walking on the trolley along the rail at a speed of 1 m/s with respect to the trolley ,find his displacement relative to the ground after 4 sec.

2. for steel surface the coefficient of friction is 0.8 and between teflon surfaces 0.04. A steel block of mass 2 kg kept on a steel surface has a limiting frictional force f. What should be the mass of a teflon block kept on a teflon surface to have the limiting frictional force same as f . Take g =10 m/s.

Thanking in anticipation
 
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Hi hims100,
I believe that you get no replies because everybody thinks this belongs in Homework Help, so maybe you try re-posting it there...:wink:

...AND tell us what you got so far and where you're stuck.
 
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