Mechanical power
A is a vector quantity - AQA - A-Level Physics - Question 6 - 2020 - Paper 1
Question 6
Mechanical power
A is a vector quantity.
B is measured in J.
C has base units of kg m² s⁻³.
D can be calculated from force × distance moved.
Worked Solution & Example Answer:Mechanical power
A is a vector quantity - AQA - A-Level Physics - Question 6 - 2020 - Paper 1
Step 1
A is a vector quantity.
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Answer
Mechanical power is a scalar quantity, not a vector quantity. Therefore, this statement is false.
Step 2
B is measured in J.
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Answer
Mechanical power is measured in watts (W), not joules (J). Joules are the units of energy, while power is defined as energy per unit time.
Step 3
C has base units of kg m² s⁻³.
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Answer
This statement is true. The base units of mechanical power can be expressed as kg·m²·s⁻³, which is equivalent to one watt.
Step 4
D can be calculated from force × distance moved.
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Answer
This statement is misleading. While power is related to force and distance, it is specifically the work done (force multiplied by distance) over time that gives power. Therefore, it cannot be simply calculated from force times distance alone without considering the time factor.
