JEE MAIN - Physics (2017 - 9th April Morning Slot - No. 4)
The machine as shown has 2 rods of length1 m connected by a pivot at the top. The end of one rod is connected to the floor by a stationary pivot and the end of the other rod has a roller that rolls along the floor in a slot. As the roller goes back and forth, a 2 kg weight moves up and down. If the roller is moving towards right at a constant speed, the weight moves up with a :
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Constant speed
decreasing speed
increasing speed
speed which is $${3 \over 4}$$th of that of the roller when the weight is 0.4 m above the ground
Explicació
As the force F acts on the horizontal direction, the vertical force acting on the rod to raise the weight to move upwards happens with decreasing speed.