Work, Power, Simple Machines

Where should the fulcrum be placed in order for the student to use the least amount of effort possible:

• further away from the load

• closer to the load

• in the center between the effort and load

• it doesn't matter

The correct unit to measure power is..

• Joule

• Newton

• Watt

• Pascal

In which case is work being done:

• a student sleeps

• a student carries his chair across the room

• a student pushes a locked door that doesn't move

• a student picks up his chair

If you use a crowbar to get a lid off a bucket, which simple machine are your using?

• inclined plane

• wheel and axle

• pulley

• lever

What type of simple machine is found on the lid of a pickle jar?

• lever

• screw

• pulley

• wedge

A flagpole or blinds on a window would be an example of which simple machine:

• pulley

• wedge

• inclined plane

• screw

Calculate the amount of work done if you use 100 Newtons of force to push a box 5 meters across the kitchen floor.

• 250 J

• 5000 J

• 500 J

• 50,000 J

The rate at which work is done is

• power

• potential energy

• kinetic energy

• work

Which of these simple machines changes the direction of your force:

• wedge

• fixed pulley

• inclined plane

• wheel and axle

No machine can be 100 % efficient because of

• waste energy

• thermal energy

• convetion energy

• friction

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-3