Here are the answers to the quiz questions:
Question 1: A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m. How much power was used?
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To calculate power, we first find work done using the formula: \[ \text{Work} = \text{Force} \times \text{Distance} = 600 , \text{N} \times 6 , \text{m} = 3600 , \text{J} \]
Power is work done over time. However, since time is not provided, we cannot determine power exactly. But the work done is 3,600 J (making this the best choice).
Correct Answer: 3,600 J
Question 2: A wheelbarrow can be considered as a compound machine because it has which of the follow two simple machines?
- A wheelbarrow consists of a wheel and axle (the wheel) and a lever (the handles act as a lever to lift the load).
Correct Answer: wheel and axle and lever
Question 3: If a man moves a large box that weighs 10 Newtons 20 meters, how much work was done?
- Work done is calculated using: \[ \text{Work} = \text{Force} \times \text{Distance} = 10 , \text{N} \times 20 , \text{m} = 200 , \text{J} \]
Correct Answer: 200 J
Question 4: Which is the correct definition of a simple machine?
- A simple machine is a device that helps to make work easier.
Correct Answer: a device that makes work easier
Question 5: What is the formula to calculate the work done on an object?
- The formula for calculating work done is: \[ \text{Work} = \text{Force} \times \text{Distance} \]
Correct Answer: force x distance
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