Warm-up - Energy - October 20, 2017

If the motion of an object is increased, which type of mechanical energy was gained by the object?

• chemical energy
• gravitational potential energy
• kinetic energy
• electromagnetic energy

Which energy-conversion process occurs whenever coal is burned?

• chemical to thermal
• chemical to electrical
• mechanical to thermal
• mechanical to electrical

How does the energy of a roller coaster cart change as the cart travels from the top of the roller coaster to the bottom?

• The cart has greater kinectic energy at the top than it does at the bottom.
• The cart has no energy at the top and more energy at the bottom.
• The cart has less potential energy at the top than it does at the bottom.
• The cart has potential energy at the top that is transformed to kinetic energy as it moves to the bottom.

The diagram shows a mass suspended on a string called a pendulum. What energy transformation occurs as the mass moves from point A to B?

• Kinetic energy is converted to potential energy.
• Potential energy is converted to kinectic energy.
• Chemical energy is converted to electromagnetic energy.
• Gravitational energy is converted to chemical energy.

As a roller coaster car travels down a hill, which type of change in energy allows it to speed up?

• potential energy changing into heat energy
• potential energy changing into kinectic energy
• kinetic energy changing into heat energy
• kinetic energy changing into potential energy

The diagram shows a 21.7kg ball located on a shelf 1.6m above the ground. Which best describes the energy of the ball?

• Its energy is lost once it falls off the shelf.
• Its energy depends upon the speed the ball will travel.
• It has mechanical energy in the form of potential energy.
• It has mechanical energy in the form of kinetic energy.

Which statement is true about the work done in lifting a box?

• Energy is transferred to the box from the lifter.
• Energy is transferred to the lifter from the box.
• The energy of the box remains constant.
• The energy of the lifter remains constant.

Which form of energy does a car's engine convert into mechanical energy?

• light
• wind
• chemical
• gravitational

Which type of energy is changed by plants into chemical energy?

• solar
• nuclear
• thermal
• gravitational

What happens when a pebble lying on the ground is kicked?

• Energy is completely lost.
• Energy is transferred.
• Energy is destroyed.
• Energy is created.