A pendulum is 0.767m long and the bob has a mass of 1.47 kg. At the bottom of it

Question

A pendulum is 0.767m long and the bob has a mass of 1.47 kg. At the bottom of its swing, the bob's speed is 1.75 m/s. What is the tension in the string at the bottom of ths string?

Why is the tension greater than the weight of the bob? Select from the following statements, which one's are true and which one's are false.

1. True or False-The bob has an upward acceleration, so the net Fy must be upward and greater than the weight of the bob.
2. True or False Since the bob is moving and its velocity is changing the tension must be greater than the weight.
3. True or False The bob has a downward acceleration, so the Fy must be downward and greater than the weight of the bob.
4. True or False If the bob were at rest, the tension would be equal to the weight of the bob.

Explanation / Answer

   1. True. It is the correct reason why the Tension is greater than its weight.    2. False. It is not the correct explanation for the question    3. False. If the bob downward acceleration then the Tension is not greater       than its weight.    4. True. The statement is correct. But it is not a correct explanation for       why the Tension is greater than its weight.

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