Question
4. An ice skater pulls three small children, one behind the other, with masses 25kg, 31 kg and 35kg. Assume that the ice is smooth enough to be considered frictionless, determine:
a) the total force applied to the train of children if they reach a speed of 3.5m/s from rest in 15 s;
b) if the skater is holding onto the 25kg child, find the tension in the arms of the next child (31 kg) in line.
a) the total force applied to the train of children if they reach a speed of 3.5m/s from rest in 15 s;
b) if the skater is holding onto the 25kg child, find the tension in the arms of the next child (31 kg) in line.
Answers
Henry
a. a = (3.5 - 0) /(15 - 0)=0.23m/s^2.
F = ma = (25 + 31 + 35) * 0.233,
= 91 * 0.233 = 21.2N.
F = ma = (25 + 31 + 35) * 0.233,
= 91 * 0.233 = 21.2N.