This simple machine works so efficiently that there is no loss of energy due to friction or heat.

• ideal machine

• steam engine

• real machine

• lever

All of the _____ of this machine is useful so it is _____ efficient.

• work, 100%

• force, 100%

• weight, 100%

• work, less than 100%

• force, less than 100%

Tags

NGSS.MS-PS3-5

Which of the following would be a frictionless machine?

• ideal

• lever

• wheel and axle

• pulley

• wedge

Which of the following would be a real machine and have friction?

• wheel and axle

• inclined plane

• lever

• pulley

• all are real machines which produce friciton

What does friction produce that reduces efficiency?

• heat

• water

• energy

• work

Tags

NGSS.MS-PS2-2

In real simple machines, work input is work:

• done on the machine

• done by the machine

• that is 100% efficient

• that is over 100% efficient

In using scissors to cut paper, the work input is:

• the person moving the scissors to cut paper

• the paper being cut

• located at the fulcrum

• located at the load

In real simple machines, work output is work:

• done on the machine

• done by the machine

• that is 100% efficient

• that is over 100% efficient

What are some other terms that can be used to refer to resistance force?

• load, resistance, and weight.

• resistance, effort force, and weight

• weight, mechanical advantage, and efficiency

• load, mechanical advantage, and ideal machine

Which of the following must be overcome in order for a simple machine to work?

• load, resistance, and weight.

• resistance, effort force, and weight

• weight, mechanical advantage, and efficiency

• load, mechanical advantage, and ideal machine