Newtons First, Second And Third Law

Question 1

Newton’s first law:

Answer 1

If the resultantt force is zero and acting on an object and:

The object is stationary - it will remain stationary
The object is moving - remains to move at same speed in same direction - same velocity.

If object moving= same speed but not same direction - then not an example of Newton’s first law.

Question 2

What happens when a vehicle is driving at a steady speed?

Answer 2

The resistive forces balance the driving force. Velocity of object will only change if resultant force acting on it.

Question 3

What is inertia

Answer 3

The tendency of objects to continue in their state of rest or of uniform motion is called inertia

Question 4

Example of Newton’s first law :

Answer 4

Tablet on table = stationary because contact force and weight force = balanced

Question 5

Newton’s second law:

Answer 5

The acceleration of an object is proportional to the resultant force acting on the object and inversely proportional to the mass of the object.
F =ma

Question 6

Newton’s second law explains:

Answer 6

Object will accelerate in response to RF - bigger RF - larger acceleration
Larger mass = smaller acceleration

Question 7

What is inertial mass?

Answer 7

A measure of how difficult it is to change the velocity of an object
Defined as the ratio of force over acceleration

Question 8

Newton’s third law:

Answer 8

Whenever two objects interact, forces they exert on each other are equal and opposite. The forces are the same.

Question 9

Inertial mass equation

Answer 9

IM = force/acceleration