1. The following are reasoning questions:
(a) Is is possible for a system to experience zero net force and yet
have non-zero net torque act on it. Explain using examples. Re-
strict your answer to under 4 lines.
(b) Is is possible for a system to experience zero net torque and yet
have non-zero net force act on it. Explain using examples. Restrict
your answer to under 4 lines.
2. A uniform ladder of length 10 m and mass 6 kg is resting against
a vertical wall making an angle of 37◦ with the ground as shown in
Fig. 1. The vertical wall is frictionless but the ground is rough with
µs = 0.75. An electrician weighing W kg climbs up the ladder to
a point 8 m from the lower end, measured along the length of the
ladder. Calculate the maxium weight Wmax of the elctrician who
can work from this without the ladder setup collapsing.
Figure 1: Problem 2: The FBD is included in the diagram. t
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