TUTORIAL 2 A

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TUTORIAL 2-PHYSICS, SHF 1215, SEM 2, 2010/2011

1 Find the weight on Earth of a body whose mass is a) 3.0 kg and b) 200

2 In Figure 1, the tension in the horizontal cord is 30 N as shown. Find the weight of the object.

3 The object in Figure 2 weighs 50 N and is supported by a cord. Find the tension in the cord.

4 A 5.0 kg object is to be given an upward acceleration of 0.3 m/s2 by a rope pulling straight upward on it as in Figure 3. Calculate the tension in the rope.

5 A horizontal force of 140 N is needed to pull a 60 kg box across the horizontal floor at constant speed.

(i) Sketch the free body diagram of the system.

(ii) Calculate the coefficient of friction between the floor and the box.

6 As shown in Figure 4, a 70 kg box is pulled by a 400 N force at an angle 30 to the horizontal. The coefficient of kinetic friction is 0.50. Find the acceleration of the box.

7 Each of the objects in Figure 5 is in equilibrium. Calculate the normal force in each case:

8 Suppose that in Figure 7 (c) the block is at rest. The angle of the incline is slowly increased. At an angle  = 42, the block begins to slide. Determine the coefficient of static friction between the block and the incline.

9 Find the torque about axis A in Figure 6 due to each of the forces shown.

10 A uniform, 100 N pipe is used as a lever as shown in Figure 7.Where must the fulcrum (the support point) be placed if a 500 N weight at one end is to balance a 200 N weight at the other end?

11 Two people are carrying a uniform wooden board that is 3.0 m long and weighs 160 N horizontally. One of them applies an upward force equal to 60 N at one end.

(i) Sketch the free body diagram of the system.

(ii) Determine the other point of lift by the second person.

12 Three main forces acting on a foot when a person is squatting are shown in Figure 8.

(i) State the conditions for a rigid body to be in translational and rotational equilibrium.

(ii) Determine the magnitude of the force FH exerted by the Achilles tendon on the heel at point H (Hint: Take point J as the axis of rotation)

(iii) Determine the magnitude of the force FJ exerted on the ankle joint at point J.