Energy Work Power and Simple Mahines

What type of energy is stored in a battery?

• mechanical

• chemical

• electrical

• nuclear

Tags

NGSS.HS-PS1-2

When a flashlight is turned on the chemical energy turns into electrical. The electrical energy gets turned into what other two forms?

• nuclear

• radiant/

  electromagnetic

• thermal

• sound

What is the IMA of this ramp? (L/h)

• 5

• 4

• 3

• 2

What happens to the amount of power when the time is decreased?

• power decreases

• power increases

• power remains the same

• power can't be measured

Choose all of the following that are examples of work being done?

• boy pushing on a car but can't move it

• lifting a box off the ground

• pulling a wagon up a hill

• a light bulb converting electricity into light and heat

• carrying a box horizontally across a room

Tags

NGSS.MS-PS3-5

A wheel barrow full of concrete mix that needs to be moved onto a platform could be done with a ramp. the advantage of using a ramp is that the work can be done

• more quickly

• using more energy

• using less force

• using less friction

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS2-4

Which pulley has an IMA of 3?

• 2

• 3

• 4

• 5

Tags

NGSS.MS-ETS1-2

After 45 minutes the bulb starts to become dim. After 60 minutes the bulb stops producing light. What is the best conclusion?

• the battery lost mass

• the moving electrons were turned into light

• the bulb destroyed all the energy in the battery

• the available energy was converted into light and heat

Tags

NGSS.MS-PS3-5

Uranium is used as a fuel in nuclear reactors where large amounts of energy are produced. Where is the energy stored before it undergoes the fission process?

• in the bonds of uranium atoms

• in the nucleus of the uranium atom

• in the electrons of the uranium atoms

• In the neutron that hits the atom

Which of these has stored elastic potential energy?

• a trampoline not being used

• a rubber ball falling from a height

• a spring sitting on a shelf

• a stretched rubber band