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What is a correct unit for the area under a force-time graph? A N m B kg m s⁻¹ C kg m s² D N s⁻¹ - AQA - A-Level Physics - Question 7 - 2018 - Paper 1
Question 7
What is a correct unit for the area under a force-time graph? A N m B kg m s⁻¹ C kg m s² D N s⁻¹
Worked Solution & Example Answer:What is a correct unit for the area under a force-time graph? A N m B kg m s⁻¹ C kg m s² D N s⁻¹ - AQA - A-Level Physics - Question 7 - 2018 - Paper 1
Step 1
What is a correct unit for the area under a force-time graph?
Answer
To determine the correct unit for the area under a force-time graph, we must understand that the area represents the impulse experienced by an object, which is the change in momentum.
Impulse can be computed as the product of force and time, which is given by the formula:
The unit of force is newtons (N), and the unit of time is seconds (s). Therefore, we can express the impulse in units as follows:
This means that the correct unit for the area under a force-time graph is newton-seconds (N s).
Thus, the answer is D: N s⁻¹.