2.4 Mechanical science principles

In science, how is energy expressed?

• As the amount of heat produced

• As the amount of light emitted

• As the amount of work done by a force

• As the amount of sound generated

What is the unit of energy?

• Newtons (N)

• Joules (J)

• Volts (V)

• Watts (W)

Which of the following statements is true about energy?

• Energy can be created and destroyed

• Energy can only be created, not destroyed

• Energy can only be destroyed, not created

• Energy cannot be created or destroyed, only converted from one form to another

What does a transducer do?

• Converts energy from one form to another

• Stores energy for later use

• Measures the amount of energy

• Destroys excess energy

What type of energy is due to motion, such as a car accelerating?

• Potential energy

• Kinetic energy

• Thermal energy

• Chemical energy

Which of the following is an example of potential energy?

• A car accelerating

• A moving bicycle

• A raised weight

• A running person

Energy can be either kinetic or _______.

• Thermal

• Chemical

• Potential

• Electrical

What type of energy depends on the relative position within a system?

• Kinetic energy

• Thermal energy

• Potential energy

• Electrical energy

What is the definition of a force?

• A push or pull that changes an object's state of motion or causes the object to deform

• A measure of an object's mass

• The speed at which an object moves

• The energy required to move an object

Which of the following is a force that attracts items that have mass or energy?

• Electromagnetism

• Gravity

• Weak interaction

• Strong interaction