Physics Help Forum Acceleration depending on angle
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 May 4th 2018, 12:31 AM #1 Member   Join Date: Apr 2017 Location: Turkey Posts: 46 Acceleration depending on angle Hello all again I tried to solve this problem but i failed , could any one help me to solve it ? i will be so thankful . Best regards Razi Attached Thumbnails
 May 6th 2018, 06:36 AM #2 Senior Member   Join Date: Jul 2009 Location: Kathu Posts: 131 Acceleration depending on angle You must show that the initial vertical acceleration of the end of the rod (book or plank or whatever is used) based on it's angular acceleration is higher than g. You must use the formula for angular acceleration for a rod based on the moment of inertia and the applied torque on the rod. The torque is at right angles to the rod. The initial vertical acceleration will depend on the geometry of the situation, in this case at what angle the plank is placed. The higher the angle, the lower the initial vertical acceleration. At an angle of about 35.3 degrees is is just about equal to g. It needs to be higher than g for the ball to depart from the plank. The rest is just geometry, the cup needs to be in the right position to be under the ball when the ball lands.

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