Physics Revision Quiz 2

What is the SI unit of force?

• Newton (N)

• Joule (J)

• Pascal (Pa)

• Watt (W)

Which of the following is always true about force?

• It is a vector quantity.

• It always acts in the direction of motion.

• It has only magnitude, no direction.

• It is measured in kg.

Which of these statements about Newton’s First Law is correct?

• An object at rest stays at rest unless acted upon by an external force.

• An object with constant velocity must be accelerating.

Which of the following best describes inertia?

• The energy stored in a moving object

• The force required to keep an object moving

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

• The acceleration of an object due to gravity

What is the formula for Newton's Second Law?

• F = ma

• P = mv

• W = mg

• F = m/a

Newton’s Third Law states that…

• For every action, there is an equal and opposite reaction.

• The acceleration of an object depends on its mass and the force applied.

Which force prevents an object from penetrating a surface?

• Friction

• Normal force

• Air resistance

• Tension

What is the mathematical formula for weight?

• W = mg

• W = ma

• W = m/g

• W = mg^2

Which of the following is an example of an external force?

• Tension in a rope inside a system

• Wind pushing a sailboat

• Internal muscle forces inside a body

• Forces between molecules in a solid

The net force on an object in equilibrium is…

• Zero

• Equal to its weight

• Equal to its acceleration

• Changing over time