Newtons Law 2

Question 1

WHAT IS NET FORCE?

Answer 1

The net force on an object is the sum of all the forces acting on the object.
Forces in the same direction are added together.
Forces in the opposite direction are subtracted.
Net force is a vector quantity, so needs to be written with a direction.

Question 2

WHAT DOES NEWTONS 2ND LAW STATE?

Answer 2

Newton’s 2nd Law states that an object’s acceleration is dependent of two variables:
The net force acting on the object and the object’s mass

The relationship between force, mass and acceleration can represented by the equation
Fnet = m x a

Where Fnet = force in Newtons (N)
m = mass in kilograms (kg)
a = acceleration in metres per second per second (m/s2)

Question 3

What is the definition of weight in physics, and what units do we use?

Answer 3

In physics, weight force is acceleration due to gravity acting on an object.

Since weight is a force it is measured in Newtons (N).
On Earth, the acceleration due to gravity is 9.8 m/s2
An object with a mass of 20 kg will have a weight of 196 N.