A worker has to lift a heavy load to a certain height. Four ideal machines are available. Their mechanical advantages are given below: Machine P: MA = 0.5; Machine Q: MA = 0.8; Machine R: MA = 2; Machine S: MA = 4. Assume all machines are frictionless and the load is to be lifted through the same vertical height. Which of the following statements is correct?

Subject: General Awareness | Topic: Science | Difficulty: MEDIUM

Options

1. (A) Machines R and S need equal effort because the load is unchanged.
2. (B) Machine S does less work than the other machines.
3. (C) Machine P needs the least effort because its MA is the smallest.
4. (D) Machine S needs the least effort but the effort is applied over the longest distance.

Verified Answer

Option (D): Machine S needs the least effort but the effort is applied over the longest distance.

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