Work, Power, & Simple Machines

_________________________________: the energy transferred to an object when an external force acts on the object to move it.

• work

• power

• torque

• mechanical advantage

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What are the possible units for work.

• N(m)

• J/s

• J

• W

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Work depends on which two factors?

• distance an object moves

• force acting in the direction of movement

• the amount of time it takes to complete the work

• the rotational axis in which the object moves

____________________: the rate of doing work.

• Power

• Ideal mechanical advantage

• Torque

• Time

What are the possible units for power?

• J/s

• N(m)

• W

• J

_________________________________: the measure of the change in input needed to do a certain amount of work when using a simple machine.

• mechanical advantage

• work

• power

• torque

Why do we use actual mechanical advantage in addition to ideal mechanical advantage?

• friction within machines wastes some of the input force

• one considers distance while the other considers force

• torque within machines wastes the output force

• these are the same type of mechanical advantage

Match the description of the simple machine to the correct term.

• lever

• a flat surface whose opposite ends are at different heights

• wheel and axe

• a wheel with a rod running through its axis that acts as the pivot point

• inclined plane

• a rigid bar that turns around a pivot point

Driving a car 100 m requires the same amount of ______________ as pushing the same car 100 m by hand.

• power

• power and energy

• time

• work

Match the lever to its correct class.

• third class

• 
• second class

• 
• first class

• 

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS2-2