Physics Laws of Motion

According to Newton's first law of motion, an object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an external force. True or False?

• True

• False

• Maybe

• Sometimes

What is the formula for Newton's second law of motion?

• F = mv

• F = a/m

• F = m^2a

• F = ma

Newton's third law of motion states that for every action, there is an equal and opposite _____________.

• equal reaction

• reaction

• opposite reaction

• opposite force

In which law of motion does Newton state that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass?

• Second Law of Motion

• Fourth Law of Motion

• First Law of Motion

• Law of Inertia

A car accelerates from rest to 30 m/s in 5 seconds. What is the acceleration of the car?

• 15 m/s^2

• 10 m/s^2

• 6 m/s^2

• 20 m/s^2

If a force of 10 N is applied to an object with a mass of 2 kg, what is the acceleration of the object?

• 2 m/s^2

• 5 m/s^2

• 7 m/s^2

• 12 m/s^2

A rocket is launched into space. According to Newton's third law, what is the reaction force to the action force of the rocket engines?

• Force pushing the rocket sideways

• Force pulling the rocket backward

• Force pushing the rocket downward

• Force pushing the rocket forward into space

Which law of motion explains why a person feels pushed back into their seat when a car accelerates quickly?

• Newton's third law of motion

• Archimedes' principle

• Einstein's theory of relativity

• Boyle's law

What is the SI unit of force?

• Watt

• Joule

• Volt

• Newton (N)

A 5 kg object is moving with a velocity of 10 m/s. What is the momentum of the object?

• 5 kg*m/s

• 25 kg*m/s

• 100 kg*m/s

• 50 kg*m/s