Force, Work, Energy

Which of the following best explains Newton's First Law?

• Every action has an equal and opposite reaction.

• Objects in motion stay in motion unless acted on by an external force.

• Force equals mass times acceleration.

• Gravity affects all objects equally.

What is inertia?

• The force of friction.

• The tendency of an object to resist changes in its motion.

• The acceleration caused by gravity.

• The energy needed to move an object.

Newton’s Second Law can be written as:

• F = ma

• F = m/v

• F = a/m

• F = 2ma

A car accelerates at 5 m/s². If the car has a mass of 1,000 kg, what is the net force acting on it?

• 100 N

• 5000 N

• 500 N

• 1000 N

What is the reaction force to gravity pulling you downward?

• Frictional force

• Normal force

• Tension force

• Centripetal force

Which of the following is not a type of energy?

• Kinetic

• Potential

• Friction

• Thermal

Kinetic energy depends on:

• Mass and height

• Speed and height

• Mass and velocity

• Mass and gravity

Which of the following is an example of potential energy?

• A rolling ball

• A stretched rubber band

• A burning candle

• Boiling water

When you eat food, the energy stored in it is an example of:

• Chemical energy

• Nuclear energy

• Thermal energy

• Mechanical energy

What is mechanical energy?

• The sum of kinetic energy and potential energy in an object.

• Energy from chemical reactions.

• Energy stored in atomical

• Energy disappears when used.