Question

2. Having had enough fun with the clay, the child, whose mass is 35kg, gets on a 4m-long swing and is released from rest by his big brother when the ropes of the swing make an angle of θ with the vertical. a. If he is moving with the speed of 4m/s at the lowest point of the trajectory, and if there is no friction in the system, what is the angle θ? b. In real life, there’s friction in everything. If the actual speed of the child at the lowest point of the trajectory is 3.5m/s, what is the mechanical energy lost due to friction?

Answer #1

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