Understanding Mechanical Power

What is the main difference between work and power?

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

• Power and work are the same concepts.

• Power is the rate at which work is done.

• Work involves time, while power does not.

Which path requires the greatest power when reaching the summit of a hill?

• The path with the steepest angle.

• The path completed in the shortest time.

• The path with the longest distance.

• The path with the least amount of work.

What is the standard metric unit of power?

• Horsepower

• Joule

• Newton

• Watt

How many watts are equivalent to one horsepower?

• 1000 watts

• 500 watts

• 746 watts

• 100 watts

In the personal power lab, what is the first step to determine power?

• Measure the time taken.

• Determine the force applied.

• Find the displacement.

• Calculate the velocity.

What is the power output if a person does 1446 joules of work in 1.03 seconds?

• 1400 watts

• 1500 watts

• 1300 watts

• 1600 watts

In the horizontal motion example, what is the coefficient of friction used?

• 0.825

• 0.625

• 0.925

• 0.725

What is the relationship between force, velocity, and power?

• Power is the ratio of force to velocity.

• Power is the difference between force and velocity.

• Power is the sum of force and velocity.

• Power is the product of force and velocity.

How is the force applied by the linemen calculated in the sled example?

• By adding mass and gravitational force.

• By dividing work by time.

• By using the coefficient of friction and normal force.

• By multiplying mass and velocity.

What is the power output when the force is 1980.8 newtons and velocity is 1.60 m/s?

• 3100 watts

• 3000 watts

• 3170 watts

• 3200 watts