A force can be defined as any push or pull which changes or tends to change the state of rest or state motion of a body. Force is a vector quantity having both magnitude and direction. The SI unit of force is newton and is denoted by N .

Weight of a body is defined as the force exerted on a body by gravity. Like all forces, weight also has a direction and it points vertically downward. Weight of a body can be given by, W = m g Where m is mass and g is acceleration due to gravity

Friction is a contact force which appears when two bodies are in contact with each other. Friction opposes the relative motion between two bodies and acts in a direction opposite to that of the applied force. Friction is necessary for the stability of the body.

E M B I B E

Secondary Physics>Chapter 2 - Force and Laws of Motion>TEST YOURSELF>Q 3

EASY

9th CBSE

IMPORTANT

Earn 100

In a tug of war, two teams are pulling the rope with equal force so that the ribbon on the rope is held in the same position. What will be the magnitude of a resultant force acting on the rope?

Important Questions on Force and Laws of Motion

EASY

9th CBSE

IMPORTANT

Secondary Physics>Chapter 2 - Force and Laws of Motion>TEST YOURSELF>Q 4

Why is a cup of tea placed on a table remains at rest? Show the forces acting on the cup.

EASY

9th CBSE

IMPORTANT

Secondary Physics>Chapter 2 - Force and Laws of Motion>TEST YOURSELF>Q 5

A body moves with a velocity of $2 m / s$ in horizontal direction. To maintain this horizontal constant velocity, what should be the forces acting on it?

EASY

9th CBSE

IMPORTANT

Secondary Physics>Chapter 2 - Force and Laws of Motion>TEST YOURSELF>Q 6

Define force.

EASY

9th CBSE

IMPORTANT

Secondary Physics>Chapter 2 - Force and Laws of Motion>TEST YOURSELF>Q 7

Define normal reaction.

EASY

9th CBSE