Understanding LOL Diagrams

What does the circle in the middle of an LOL diagram represent?

• The energy gained from external sources

• The total energy of the system

• The objects in the system

• The energy lost to friction

In a closed energy system, what must remain constant before and after an event?

• The amount of potential energy

• The number of objects

• The total energy

• The amount of kinetic energy

When a box compresses a spring and is released on a smooth surface, what type of energy does it primarily convert to?

• Thermal energy

• Kinetic energy

• Gravitational potential energy

• Chemical energy

Why is it acceptable to include Earth in the system when considering gravitational potential energy?

• Because gravitational potential energy can be calculated using MGH

• Because Earth has no effect on energy calculations

• Because Earth is always part of any system

• Because it simplifies momentum calculations

What happens to the energy of a box moving up a ramp when it reaches a stop at a certain height?

• It is lost as thermal energy

• It is converted entirely into gravitational potential energy

• It remains as elastic potential energy

• It is converted entirely into kinetic energy

What is the effect of a rough surface on the energy of a moving object?

• It increases the object's kinetic energy

• It converts some kinetic energy into thermal energy

• It has no effect on the object's energy

• It converts all energy into gravitational potential energy

In an open system, what can happen to the total energy before and after an event?

• It must remain the same

• It must decrease

• It can change

• It must increase

What is the main characteristic of an elastic collision?

• Kinetic energy is lost

• Kinetic energy is conserved

• All energy is converted to thermal energy

• Momentum is not conserved

In an inelastic collision, what happens to some of the kinetic energy?

• It is lost to the environment

• It is conserved

• It is converted into internal energy

• It is converted into gravitational potential energy

How can you determine the amount of energy converted to internal energy in an inelastic collision?

• By measuring the change in temperature

• By calculating the difference in initial and final kinetic energy

• By observing the change in velocity

• By measuring the distance traveled