Chapter 14 Test Review

Front

What is the ideal mechanical advantage of a pulley system?

Back

The ideal mechanical advantage of a pulley system is equal to the number of rope segments supporting the load.

Front

How do you convert watts to horsepower?

Back

To convert watts to horsepower, divide the power in watts by 746. For example, 5,222 W is approximately 7 hp.

Front

What is the horsepower rating of a 1500-W motor?

Back

A 1500-W motor is rated as a 2-horsepower motor.

Front

How do you calculate work done when lifting an object?

Back

Work done (in joules) is calculated by multiplying the force (in newtons) by the distance (in meters) moved. For example, 9 N exerted over 1.5 m results in 13.5 J of work.

Front

What type of simple machine is a knife?

Back

A knife is an example of a wedge.

Front

What is the formula for calculating mechanical advantage?

Back

Mechanical advantage = Load force / Effort force.

Front

What is the definition of work in physics?

Back

Work is defined as the product of force and the distance over which it acts, measured in joules.

Front

What is the relationship between power and work?

Back

Power is the rate at which work is done, measured in watts (1 watt = 1 joule/second).

Front

What is a first-class lever?

Back

A first-class lever is a simple machine where the fulcrum is between the effort and the load, like a seesaw.

Front

What is a second-class lever?

Back

A second-class lever is a simple machine where the load is between the effort and the fulcrum, like a wheelbarrow.