Question

1.Why is it important that the string attached to the revolving mass be parallel to the platform?

A.This minimized any effects of vertical forces.

B.The tension in the system will increase.

C.The mass will come untied if the string is at an angle.

D.This minimizes the effects of centrifugal forces.

Match the motion that results from the following combinations velocity and acceleration. Velocity and acceleration in the same direction [Choose ] ✓ Increase in velocity No change in velocity Decrease in velocity Reverses direction of motion [ CTIUUS) Velocity and acceleration in opposite directions [Choose] Velocity and acceleration in normal (perpendicular) directions

Answer 1

Question 1)

Since in case of vertical motion, the effects of gravity will take place and thus this will affect the Tension in the string along with the velocity which in turn will affect the centrifugal force hence option A is correct.

question 2)

a) if velocity and acceleration are in same direction than due to acceleration the velocity will keep on increasing as its in same direction of that of velocity.

b) if the velocity and acceleration are in opposite direction than initiallly the velocity will decrease and will get to zero, after that the velocity will start increasing as than the acceleration and velocity will be in same direction.

c) since the velocity and direction of acceleration are perpendicular to each other thus there wont be any change of velocity in the initial direction as there is no acceleration. Although the object will start gaining velocity in the perpendicular direction thus changing the resultant velocity of the object.