Work and Power

Mr. Andersen explains the concepts of work and power in physics. Work is defined as applying a force over a distance, measured in joules, while power is the rate of doing work, measured in watts. The video provides examples of calculating work in different scenarios, emphasizing the importance of force and distance being in the same direction. It also covers how to measure work in a lab setting using force versus distance graphs and discusses the historical context of James Watt's contributions to understanding work and power.

What is the primary difference between work and power?

• Work is measured in watts, while power is measured in joules.

• Work is the energy added to a system, while power is the rate of doing work.

• Work is the force applied, while power is the distance moved.

• Work is the speed of an object, while power is the force applied.

Which condition must be met for work to be done on an object?

• The force applied must be perpendicular to the direction of movement.

• The object must be moving in a circular path.

• The object must be stationary.

• The force applied must be parallel to the direction of movement.

If a 6 Newton force is applied to a box and it doesn't move, how much work is done?

• 36 joules

• 12 joules

• 0 joules

• 6 joules

How do you calculate work when a force is applied at an angle?

• Multiply the force by the sine of the angle.

• Divide the force by the cosine of the angle.

• Add the force to the cosine of the angle.

• Multiply the force by the cosine of the angle.

What is the power output if 32 joules of work is done in 3 seconds?

• 10 watts

• 96 watts

• 11 watts

• 32 watts

How does the time taken to do work affect the power output?

• Time does not affect power.

• Less time results in more power.

• More time results in more power.

• Power is only affected by the amount of work, not time.

In a physics lab, how can you determine the work done using a graph?

• By counting the number of data points on the graph.

• By measuring the height of the graph.

• By calculating the slope of the graph.

• By finding the area under the force versus distance curve.