NEWTON 1ST LAW
If the resultant force acting on an object is zero, all the forces are said to be balanced.
This forms the basis of Newton's first law of motion, which states:
If the forces on an object are balanced, the object will continue to do what it is already doing, which is called as inertia:
Example: Inertia is commonly occurred in driving a car. When a car is at its motion and stay at the same speed and direction, so does the driver and passenger inside the car. And when the car stops suddenly, the driver will continuously stay in the previous motion, which will cause accident. That is why we need to wear seatbelt as a safety device and to prevent accident. This is an illustration of what will happen if the car suddenly stops.
If the resultant force acting on an object is zero, all the forces are said to be balanced.
This forms the basis of Newton's first law of motion, which states:
If the forces on an object are balanced, the object will continue to do what it is already doing, which is called as inertia:
- If the object is stationary, it will remain stationary
- If the object is moving, it will continue to move at the same speed and in the same direction
Example: Inertia is commonly occurred in driving a car. When a car is at its motion and stay at the same speed and direction, so does the driver and passenger inside the car. And when the car stops suddenly, the driver will continuously stay in the previous motion, which will cause accident. That is why we need to wear seatbelt as a safety device and to prevent accident. This is an illustration of what will happen if the car suddenly stops.
NEWTON 2ND LAW
If the resultant force acting on an object is not zero, all the forces are said to be unbalanced.
This forms the bases of Newton's second law of motion which states:
The resultant force acting on an object is related to the object’s mass and acceleration. These three factors are linked by the following equation:
F=M x A
Resultant force is measured in Newton (N)
Mass is measured in Kilograms (kg)
Acceleration is measured in metres per second per second (m/s2).
Example of Newton 2nd law Calculation:
A car has a mass of 2,000 kg. What force must the car’s engine supply to cause an acceleration of 1,5 m/s2?
F = M x A
= 2000 kg x 1,5 m/s2
= 3000 N
If the resultant force acting on an object is not zero, all the forces are said to be unbalanced.
This forms the bases of Newton's second law of motion which states:
- The speed of the object may change - it may either increase or decrease
- The direction of motion may change
The resultant force acting on an object is related to the object’s mass and acceleration. These three factors are linked by the following equation:
F=M x A
Resultant force is measured in Newton (N)
Mass is measured in Kilograms (kg)
Acceleration is measured in metres per second per second (m/s2).
Example of Newton 2nd law Calculation:
A car has a mass of 2,000 kg. What force must the car’s engine supply to cause an acceleration of 1,5 m/s2?
F = M x A
= 2000 kg x 1,5 m/s2
= 3000 N
NEWTON 3RD LAW
Newton 3rd law is about action and reaction. For every action there always an equal and opposite reaction. Example: When someone put a book on the table. Why a book doesn't fall? Because there is a table that holds the book. If there is no table, the book would fall as the gravity pull the book. The book is also exerting an equal and opposite force on the table, and this is why the table feels the weight of the book. If the book were very heavy, its weight would cause the table to bend, or even break.
Newton 3rd law is about action and reaction. For every action there always an equal and opposite reaction. Example: When someone put a book on the table. Why a book doesn't fall? Because there is a table that holds the book. If there is no table, the book would fall as the gravity pull the book. The book is also exerting an equal and opposite force on the table, and this is why the table feels the weight of the book. If the book were very heavy, its weight would cause the table to bend, or even break.