Physical Science Chapter 14 Sections 14.1 Work And Power 14.2 Work And Machines

In Science, work is done when a ___ acts on an object in the direction the object moves

Why isn't work being done on a barbell when a weight lifter is holding the barbell over his head?

Describe what conditions of force and motion result in maximum work done on an object

Is the following sentence true or false? A vertical force does work on an object that is moving in a horizontal direction

In science, work that is done on an object can be described as the force acting on the object multiplied by the _____________ the object moves.

Choose the letter of the correct form of the work equation to use when determining the distance an object moves as a result of a force applied to it.

The SI unit of work is the

Choose the letter of the amount of work done when a 1 newton force moves an object 1 meter

Is the following sentence true or false? Power is the rate of doing work.

In order to do work faster, more _________ is required.

Choose the letter of each sentence that is true about power.

Write a word equation describing how to calculate power.

The SI unit of power is the __________

Choose the letter of the expression that is equivalent to one watt.

How much work does a 100-watt light bulb do when it is lit for 30 seconds?

Choose the letter of the quantity that is approximately equal to one horsepower.

Why did James Watt use the power output of a horse to compare the power outputs of steam engines he designed?

Describe what a machine is able to do

Is the following sentence true or false? A machine can make work easier to do by changing the size of the force needed, the direction of a force, or the distance over which a force acts

Consider the equation Work = Force X Distance. If a machine increases the distance over which a force is exerted, the force required to do a given amount of work _______.

Give an example of a machine that changes the direction of an applied force.

When you make several trips to unload a few heavy items from a car instead of moving them all at once, the total distance over which you exert yourself _______.

The work done by a machine is always less than the work done on a machine because of ________.

Choose the letter of the definition for input force.

Write a word equation that describes work input

Is the following sentence true or false? Every machine uses some of its work input to overcome friction.

The force exerted by a machine is called the _____force

Circle the letter of the expression that equals the work output of a machine.

Is the following sentence true or false? Output work always is less than input work.

How can you increase a machine's work output?