2)A person drew a force diagram for a pendulum bob at the bottom of its swing. H

Question

2)A person drew a force diagram for a pendulum bob at the bottom of its swing. He put a horizontal force arrow in the direction of the velocity. Evaluate his diagram by choosing from the statements below.

1.He is incorrect since the force should point partly forward and tilt partly down.

2.He is correct since any moving object has a force in the direction of its velocity.

3.He is correct but he also needs to add an outward (down) force.

4.He is incorrect since there are no forces in the direction of the object's velocity.

Explanation / Answer

4.He is incorrect since there are no forces in the direction of the object's velocity.

the only forces acting in the system are, gravitational force and tension; where gravitational force is always pointing downward and the tension is always pointing towards the pivot.

There could be a third force, which is the air resistance, but it is to weak compared with the previous forces.

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