Force and law of motion
Notes and Important notes
Class 9
Science
Answers
Answer:
According to Newton's First Law of Motion, “an object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force.” The tendency of uninterrupted objects to stay at rest or to keep moving ifinmotion with the same velocity is known as inertia.
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Balanced and Unbalanced Forces
When balanced forces are applied to an object, there will be no net effective force acting on the object. Balanced forces do not cause a change in motion.
Unbalanced forces acting on an object change its speed and/or direction of motion. It moves in the direction of the force with the highest magnitude.
Balanced and Unbalanced
Net force
When multiple forces act on a body, they can be resolved into one component known as the net force acting on the object. For Example:
Net Force
To know more about Types of Forces and Their Nature, visit here.
First Law of Motion
Frictional force
The force that opposes relative motion is called friction. It arises between the surfaces in contact.
Example: When we try to push a table and it does not move is because it is balanced by the frictional force.
Frictional force
First Law of Motion
A body continues to be in the state of rest or uniform motion in a straight line unless acted upon by an external unbalanced force. The First Law is also called the Law of Inertia.
Newton’s First Law of Motion
To know more about First Law of Motion, visit here.
Inertia
Basically, all objects have a tendency to resist the change in the state of motion or rest. This tendency is called inertia. All bodies do not have the same inertia. Inertia depends on the mass of a body. Mass of an object is the measure of its inertia.