A child is riding an expensive skateboard with frictionless wheels at a constant velocity when the...
A child is riding an expensive skateboard with frictionless wheels at a constant velocity when the child runs straight into the centre of a door which has much more mass than the child. As a result, the door swings open slowly while the child and skateboard stop moving. Assume that the door has no friction. Which of the following quantities are conserved?
(A) Mechanical energy.
(B) Linear momentum.
(C) Angular momentum
(D) there are no conserved quantities
(E) There are multiple conserved quantities
Homework Answers
There is collision between the skateboard and the doors. Whenever collision takes places, energy is lost in forms of sound, light etc. So mechanical energy is not conserved.
During the collision the door swings so, angular momentum is conserved about the hinge of the doors.
Answer: (C) Angular momentum.
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