Energy Transfer & Transformation

What energy change takes place when the wrecking ball strikes the wall?

• The wall transfers potential energy to the wrecking ball.

• The wall transfers kinetic energy to the wrecking ball.

• The wrecking ball transfers potential energy to the wall.

• The wrecking ball transfers kinetic energy to the wall.

The photo shows a Newton's cradle. The ball on the left can be pulled away from the others. After the ball is released, it strikes the next ball in line and the ball on the far right side of the toy moves up and away.

What most likely explains the motion of the ball on the far right?

• The mechanical energy of the ball on the left is transferred in the form of waves to the ball on the right.

• The potential energy of the ball on the left is transferred in the form of waves to the ball on the right.

• The potential energy of the ball on the left is transferred directly to the ball on the right.

• The mechanical energy of the ball on the left is transferred through the other balls to the ball on the right.

Andrea ate a bowl of cereal for breakfast. Then she played a game of soccer with her friends. During the game, Andrea became hot and started to sweat.

Which 2 statements provide evidence of conservation of energy in this scenario?

• The chemical energy in the cereal transformed into mechanical energy that Andrea used to play soccer.

• The mechanical energy of Andrea's legs was created by the collision of her feet with the ground.

• The chemical energy in the cereal was transformed into thermal energy that increased Andrea's body temperature.

• The thermal energy of Andrea's body was transformed to chemical energy that was stored in her sweat.

The diagram shows a roller-coaster track. Assume that the system is closed. At point B, the roller-coaster car is at the highest point of the ride.

Which best describes the relative amounts of potential & kinetic energy of the roller-coaster car that has stopped briefly at point B before heading down the other side of the hill.

• Only potential energy

• Only kinetic energy

• Mostly kinetic energy with some potential energy

• Mostly potential energy with some kinetic energy

The change shown in the photo involves 2 energy transformations

• Chemical energy --> Thermal energy

• Thermal energy --> Chemical energy

• Thermal energy --> Electrical energy

• Chemical energy --> Electromagnetic energy

During a collision, energy transfers from the _____________ object to the

____________ object.

• Moving to nonmoving

• Nonmoving to moving

• Moving to moving

• Nonmoving to nonmoving

Which is an example of mechanical waves?

• Light waves

• Water waves

• Sound waves

• Tsunamis

An event in which two or more objects hit or run into each other

• Closed system

• Heat

• Collision

• Kinetic energy

The energy in an object or a system due to the kinetic energy of its particles (or its temperature)

• Thermal energy

• Chemical energy

• Electrical energy

• Mechanical energy

Energy related to an object's motion

• Mechanical energy

• Potential energy

• Electrical energy

• Kinetic energy