14.2 Work and Machines

What is a machine?

• A device that changes inertia

• A device that changes a force

• My toothbrush

• A device that changes mass

What is the force exerted on a machine called?

• Input Force

• Work Input

• A Push

• Exertion

What could an oar be considered?

• An Input

• A Force

• Wood

• A Machine

What are 3 things machines could do?

• Increasing Force

• Decreasing Force

• Increasing Distance

• Changing Direction

• Decreasing Distance

What is an example of a machine that increases force?

• Car Jack

• Oar

• Tire

• Comb

What is input distance?

• How far I push it

• The distance the input force acts against

• The distance the input force acts through

• The distance the out force acts through

What is work input?

• Work being inputed

• The work done by the input force acting through the output distance

• The work done by the input force acting through the input distance

• The work done by the output force acting through the input distance

What is output force?

• The force exerted by a machine

• The force changed by a machine

• The force that wasn't used

• The force that was used to get out of bed

What is the difference between an oar and a car jack?

• One increases force while the other increases distance

• There is no difference

• One increases force while the other decreases force

• One increases distance while the other decreases distance

How can using a machine make a task easier to perform?

• Altering size of force needed

• Direction of force

• It isn't useful

• They do stuff for you

• Distance over which a force acts