Input and Output

If a pulley does 43 J of work to lift a crate, is this work input or output?

• input

• output

If Shrek puts 1200J of work into a lever to lift a boulder, is this work input or output?

• input

• output

If Messi uses 5N of force to lift a bunch of soccer balls with a pulley, is this input force or output force?

• input

• output

A lever applies 79N of force to lift a go kart, is this an input force or an output force?

• input

• output

To open a soda bottle, a force of 61 N is applied to the bottle opener. Is this an input or output force?

• input

• output

How do machines make work easier?

• by increasing distance over which force is applied

• by decreasing the distance over which force is applied

• machines change the amount of work done

How can simple machines make work easier?

• by decreasing the force needed to complete the task

• by increasing the friction between the machine and the object

• by adding more work on the object than originally applied

• by removing the force of gravity on the object

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

The unit used to measure work is the 

• Watt
• Newton
• Joule
• Meter

Tags

NGSS.MS-PS3-5

how does a machine change the amount of work done?

• it depends on the machine

• a machine doesn't change the amount of work done

• it doubles the amount of work done

• it makes less work being done

No machine in existence has 100% efficiency due to ____________________.

• magic
• friction
• smoke
• input

Tags

NGSS.MS-PS2-2