Conservation of Mechanical Energy

What is the energy of a motorcycle moving slowly at the top of a hill?

• entirely kinetic

• entirely potential

• entirely gravitational

• both kinetic and potential

Which event does not describe potential energy being changed into kinetic energy?

• A box sliding down a ramp

• A mango falling from the tree

• A pen spring being compressed

• A stretched band got loosened

Which event illustrates the direct transformation of potential to kinetic energy?

• A basketball player catches a flying ball.

• A kalesa moves from rest.

• Kathy's arrow is released from its bow.

• The spring mechanism of a toy is rotated until it is locked

Which among the forms of energy is considered potential energy?

• chemical energy

• radiant energy

• sound energy

• thermal energy

Which of the following happens to a coconut that falls freely?

• Loses potential energy and gains kinetic energy

• Loses both potential energy and kinetic energy

• Gains potential energy and loses kinetic energy

• Gains both potential energy and kinetic energy

A torchlight from a watch tower. What is the potential energy of the torch light at the highest point compared to its kinetic energy at the lowest point?

• lesser

• equal

• greater

• not related

The potential energy of a 1-kg object on top of a hill is 18J. What is its velocity in m/s just before it hits the bottom of the hill?

• 36

• 18

• 6

• 3

What is the total mechanical energy of a swinging bungee jumper?

• is equality divided between kinetic and potential energy

• at any one instant is either all kinetic energy or all potential energy

• can never be negative

• is constant if only conservative forces act.

A bag drops some distance and gains 90 J of kinetic energy. Considering air resistance, how much gravitational potential energy did the bag lose?

• more than 90J

• exactly 90J

• less than 90J

• cannot be determined from the information given

What does the wind -up toy that is fully wound and at rest possesses?

• kinetic but no potential energy

• potential but no kinetic energy

• both potential and kinetic in equal amounts

• neither potential nor kinetic energy