NCFE Physical Science Lesson Quiz

According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by what?

• internal force

• friction

• external force

• gravity

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

• F = ma

• E = mc^2

• a = F/m

• F = m/g

Which of Newton's laws states that for every action, there is an equal and opposite reaction?

• Newton's third law

• Newton's fourth law

• Newton's second law

• Newton's first law

What is the SI unit of force?

• Meter

• Newton

• Kilogram

• Joule

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?

• Law of inertia

• Newton's first law

• Newton's third law

• Newton's second law

What is the force that opposes the relative motion or tendency of such motion of two surfaces in contact called?

• friction

• gravity

• velocity

• inertia

What is the force that opposes the motion of an object through a fluid called?

• lift force

• drag force

• pull force

• push force

What is the force that pulls objects towards the center of the Earth called?

• electromagnetism

• gravity

• centrifugal force

• magnetism

What is the force that keeps an object moving in a circle called?

• Centripetal force

• Centrifugal force

• Gravitational force

• Frictional force

What is the force that acts on an object due to gravity called?

• mass

• velocity

• friction

• weight