Chapter 3: Newton's Laws of Motion

Question 1

State Newton’s First Law of Motion.

Answer 1

An object at rest will remain at rest and an object in motion will continue moving in a straight line at a constant speed, unless it is compelled to change that state by forces acting on it.

Question 2

State Newton’s Second Law of Motion.

Answer 2

The acceleration of an object is proportional to the force acting on it, or a = F/m, where a is the acceleration of the object, F is the net force on the object, and m is the object’s mass.

Question 3

State Newton’s Third Law of Motion.

Answer 3

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

Question 4

Define matter.

Answer 4

Matter is the term we use for anything made of atoms or part of atoms.

Question 5

Define Inertia.

Answer 5

Inertia is a property that all matter possesses, which causes a material object always to resist changes to its state of motion.

Question 6

Define Mass.

Answer 6

Mass is the variable we use to specify a quantity of matter, and the unit for measure for mass is the kilogram in the MKS system.

Question 7

Define Weight.

Answer 7

Weight is the force with which gravity is pulling on a object.

Question 8

State the weight equation.

Answer 8

Fw = m g
where
Fw is the weight in N
m is the mass in kg
g is the acceleration of gravity in m/s2.