Identical marbles are released from the same height on each of the following fou

Question

Identical marbles are released from the same height on each of the following four frictionless ramps. Compare the speed of the marbles at the end of each ramp. Explain your reasoning. A force of only 150 N can lift a 600 N sack of flour to a height of 0.50 m when using a lever as shown in the diagram below. a. Find the work done on the sack of flour (in J). b. Find the distance you must push with the 150 N force on the left side (in m). c. Briefly explain the benefit of using a lever to lift a heavy object.

Explanation / Answer

Since h is same for all so velocity at the bottom will be same for all cases by conservation of energy as friction is not there

So velocity of all will be same

Second question

Work done by us 150*0.5=75 J

Work done by gravity=600*0.5=-300 J

b) distance pushed=0.5 m

(c) as seen work required=600*0.5=300 N but work we did =75 J so we can lift more weight by using less force if lever is usex

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