To understand that the direction of acceleration is in the direction of the chan

Question

To understand that the direction of acceleration is in the direction of the change of the velocity, which is unrelated to the direction of the velocity. The pendulum shown makes a full swing from - phi/4 to + phi/4. Ignore friction and assume that the string is massless. The eight labeled arrows represent directions to be referred to when answering the following questions. Which of the following is a true statement about the acceleration of the pendulum bob, a rightarrow a rightarrow is equal to the acceleration due to gravity. a rightarrow is equal to the instantaneous rate of change in velocity a rightarrow is ar to the bob's trajectory. a rightarrow is tangent to the bob's trajectory. What is the direction of a rightarrow when the pendulum is at position 1? Enter the letter of the arrow parallel to a rightarrow What is the direction of a rightarrow at the moment the pendulum passes position 2? Enter the letter of the arrow that best approximates the direction of a rightarrow.

Explanation / Answer

a) a is the instantaneous rate of change in velocity

b) in the direction of H because g is acting down warda and ac is acting to wards the center so resultant a is acting H direction

c) The tension in the string provides the acceleration equal in magnitude but
opposite in direction to accleration due to gravity so in the direction of c

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