9.03: Work and Energy Revision

What is the formula for work?

• Force = work × distance

• Distance = force × work

• Work = force × distance

• Work = force × mass

What is the S.I unit of work?

• N.m²

• (Kg.m²) / s²

• J/m

• J

Tags

NGSS.MS-PS3-5

In which scenario is work = 0 J ?

• Pushing a stationary wall

• Pulling a trolley car

• Pushing a book across the table

• Dropping a set of keys from a height, h.

In which of the following situations do your arms do work on books?

• holding a heavy stack of books while standing
• carrying a heavy stack of books
• dropping a stack of books onto a table
• picking up a pile of books from the floor

Tags

NGSS.MS-PS2-4

If W=Fd

Then how much work is done if it takes 20N to move a box 10 meters

• 0 J

• 2 J

• 20 J

• 200 J

What is energy?

• something that picks up things, like a magnet.

• Motion of an object

• ability to do work

• magic rays of sunshine that come down when you're feeling blue.

What kind of energy is in a rock at the edge of a cliff?

• Gravitational potential energy

• Kinetic energy

Water stored in a dam possesses

• (a) no energy

• (b) electrical energy

• (c) kinetic energy

• (d) potential energy

Tags

NGSS.MS-PS3-2

What is the principle of conservation of energy?

• energy cannot be created or destroyed but can only be converted from one form to another

• energy can be created and destroyed as it converts from one form to another

• energy cannot be converted from one form to another

What is the energy conversion when you put batteries in a flashlight to make it turn on?

• chemical to light

• light to kinetic

• chemical to heat

• nuclear to light