Physics Question

Two toy ducks, attached to each other by a

string, are being pulled by a very happy guy

who just got them as a graduation present

(Fig. 4.31). The front duck is 5.0 kg and the

back duck is 2.0 kg. If the happy guy pulls

them with a force of 10 N and there is no

friction, calculate

a) the acceleration of both ducks.

chapter 4: Newton’s Fundamental Laws 147

b) the tension in the string connecting duck 1

and duck 2.

1 answer

f = m a ... twice

both ... 10 = (5.0 + 2.0) * a

tension ... t = 2.0 * a ... a from 1st calculation