Newtonian Mechanics & Relativistic Mechanics

What is Newton's First Law of Motion also known as?

• The Law of Acceleration

• The Law of Inertia

• The Law of Action-Reaction

• The Law of Force

If an object is moving at constant velocity, the net external force acting on it?

• There is a net external force acting on it.

• The net external force is zero

• The net external force is equal to the object's mass.

• The net external force is equal to the object's acceleration.

Which of the following is an example of Newton's Third Law of Motion?

• A car accelerating when the engine is turned on.

• A book resting on a table.

• A rocket launching into space by expelling gas.

• A ball rolling down a hill.

What is the unit of force in the International System of Units (SI)?

• Joule

• Newton

• Pascal

• Watt

A car of mass 1000 kg is moving with a constant velocity of 20 m/s. What is the net force acting on the car?

What happens to the gravitational force between two objects if the distance between them is doubled?

• It doubles

• It is halved

• increases to 4 times

• decreased to 4 times

If the net force acting on an object is zero, then the object will:

• Accelerate

• Remain at constant velocity

• Change direction

• Increase its mass

An object is in free fall near the surface of the Earth. What is its acceleration in m/s², assuming no air resistance?

• 9.8

• 0

• 8.8

• 980

Newton's second law is given by .....

• F=ma²

• F=m²a

• F=ma

• None