Understanding Work and Energy

What is the definition of kinetic energy?

• Kinetic energy is the energy released during a chemical reaction.

• Kinetic energy is the energy of an object in motion.

• Kinetic energy is the energy associated with an object's temperature.

• Kinetic energy is the energy stored in an object at rest.

What is the definition of potential energy?

• Kinetic energy is the energy of motion.

• Potential energy is the energy an object has due to its temperature.

• Potential energy is the energy possessed by an object due to its position or state.

• Potential energy is the energy released during a chemical reaction.

Name one form of energy that is not kinetic or potential.

• nuclear energy

• thermal energy

• mechanical energy

• electrical energy

What happens to energy when a ball is thrown up?

• Energy is converted from kinetic to potential energy and vice versa.

• Energy is only potential when the ball reaches its highest point.

• Energy remains constant throughout the motion of the ball.

• Energy is lost as heat when the ball is thrown up.

How is kinetic energy calculated?

• KE = m * v^2 / 2

• KE = m * v

• KE = 0.5 * m * v^2

• KE = 0.5 * v^2

What is gravitational potential energy?

• Gravitational potential energy is the energy stored in an object as a result of its vertical position or height.

• The energy associated with an object's mass regardless of its position.

• The energy required to lift an object to a certain height.

• The energy produced by gravitational waves.

Can energy change from one form to another? Give an example.

• Energy cannot change forms; it remains constant.

• Energy can only be created, not transformed.

• Yes, energy can change from one form to another. An example is the conversion of potential energy to electrical energy in a hydroelectric power plant.

• An example of energy change is a rock falling to the ground.

What is the unit of energy?

• Calorie

• Volt

• Watt

• Joule

What is work done by a force?

• Work done by a force is the product of the force and the distance moved in the direction of the force.

• Work done is the speed of an object multiplied by time.

• Work done is the total energy consumed by a force.

• Work done is the sum of all forces acting on an object.

How do you calculate work done?

• Work = Energy x Time

• Work = Force + Distance

• Work = Force x Distance x cos(θ)

• Work = Mass x Acceleration