SUB 10/3 Work and Power

The distance the resistance end of a lever moves is called the _________.

• Output Distance

• Output Work

• Output Force

The ratio of work output to work input is called

• energy

• efficiency

• friction

• mass

No machine can be 100% efficient because of

• Thermal energy

• Waste energy

• Convection energy

• Friction

Tags

NGSS.MS-PS2-2

The factor by which a simple machine makes doing work feel easier.

• Input Force

• Efficiency

• Mechanical Advantage

Tags

NGSS.MS-ETS1-1

You apply a force of 10 N on to the end of a lever to open a paint can lid. The

resistance of the lid is 20 N. Calculate the MA.

(a)  

You apply a force on a crowbar to open a stuck door. The effort length of the

crowbar is 24 cm long and the resistance length is 6 cm. Find the MA of the crowbar.

(a)  

A compound machine --

• Doesn't exist

• is a combination of two or more simple machines

• is only one simple machine

• is used to make work harder

The Mechanical Advantage (MA) of a simple machine makes work

• Easier

• Harder

• No difference to the work done

• None Of the above

The force exerted on the machine is the ______ _______, and the force the machine exerts on an object is called the _______ _______.

• output force, input force

• input force, output force

• greater force, lesser force

The input force multiplied by the input distance equals the

• input work.

• output work.

• work.

• power.

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1