Questions: 5. Why can the efficiency of a machine never be 100 percent? A. Friction converts some energy into a useless form. B. The power used can't be measured accurately. C. Machines can't transform energy from one type to another. D. Energy isn't conserved.

5. Why can the efficiency of a machine never be 100 percent?
A. Friction converts some energy into a useless form.
B. The power used can't be measured accurately.
C. Machines can't transform energy from one type to another.
D. Energy isn't conserved.

Transcript text: 5. Why can the efficiency of a machine never be 100 percent? A. Friction converts some energy into a useless form. B. The power used can't be measured accurately. C. Machines can't transform energy from one type to another. D. Energy isn't conserved.

Solution

Solution Steps

Step 1: Identify the Correct Answer

The efficiency of a machine can never be 100 percent because some energy is always lost in the process.

Step 2: Analyze the Options

Option A: Friction converts some energy into a useless form.
Option B: The power used can't be measured accurately.
Option C: Machines can't transform energy from one type to another.
Option D: Energy isn't conserved.

Step 3: Select the Most Accurate Explanation

Option A is correct because friction and other resistive forces convert some of the input energy into heat or other non-useful forms, preventing 100 percent efficiency.

Final Answer

The correct answer is A.

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