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Parallel Forces Short Answer Problems
Directions: Selected problems from the following will be assigned to the various labs performed in this chapter. Answer each problem using complete sentences. Include a detailed and LABELLED diagram for each problem.
1. Compare and contrast TORQUE and FORCE.
2. Compare and contrast TRANSLATIONAL equilibrium and ROTATIONAL equilibrium. (two similarities, two differences)
3. Explain how you would employ the principle of torque to loosen a rusty bolt.
4. Two forces equal in magnitude, but opposite in direction, with parallel lines of action are exerted on an object When is the object in equilibrium?
5. Two rectangular crates of different dimensions but equal mass are placed on an inclined plane, without touching one another. As the angle of the incline is increased, one crate tips before the other. EXPLAIN IN DETAIL.
6. Does a COUPLE acting on an object have any effect in producing any translational motion of that object? Explain.
7. What variable(s) must exist for MAXIMUM efficiency for the operation of a lever?
8. What conditions must be established to produce the following:
(A) stable equilibrium –
(B) neutral equilibrium –
(C) unstable equilibrium –
9. A SINGLE force acting on a body WILL produce rotation. What is the major EXCEPTION to the above situation? Explain in detail.
10.
What variable(s) affect the stability of an object?
11. An object has a series of forces acting on it such that the NET force is zero, and yet the net torque is non-zero. Explain.
12. You want to pry up a heavy concrete sidewalk using a long bar and a block of wood. Explain how you would set up the bar and block to minimize your exertion.
13.
When you carry a heavy object in you arms you lean backward, but when you
carry the same object in a backpack you lean forward.
Explain.
14. Explain how you would employ the principle of torque when designing a diving board for your swimming pool.