KE & PE Notes

Gravitational potential energy depends on the ________ and ________ of the object.

• Mass and height

• Friction and acceleration

• Mass and gravity

• Height and Friction

Which two factors affect an object's kinetic energy?

• area and volume

• mass and weight

• weight and height

• mass and speed

Which point represents maximum potential energy? 

• W

• X

• Y

• Z

As you go up a hill…

• Potential energy increases and kinetic energy decreases 

• Potential energy will remain constant

• Kinetic energy increases and potential energy decreases

• Kinetic energy will remain constant

As mass increases, kinetic energy...

• increases

• decreases

• stays the same

Which has a greater impact on kinetic energy?

• mass

• velocity (speed)

What would have the greatest kinetic energy?

• A car driving down a hill.
• A person running down a hill. 
• A ball rolling down a hill. 

Which object has the most potential energy?

• A ball resting on the ground.

• A ball being thrown at 100 miles per hour.

• A ball on top of a refrigerator.

• A ball resting on the edge of a cliff.

Ansley was drying her hair with her new blow dryer while getting ready for school in the morning.  According to the law of conservation of energy, if the dryer produced 30 joules of electrical energy and it was converted to sound and heat, how much of the energy will be permanently lost?  

(HINT: The joule is a unit for measuring energy.)

• 15 Joules

   

• 0 Joules

• 30 Joules

• 10 Joules

What is the gravitational potential energy (GPE) of a 1 kg book that is 1 m above the ground? (g=9.8 m/s2)

• 9.8 J

• 0.1 J

• 1.0 J

• 11.8 m/s2