EASY
9th CBSE
IMPORTANT
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What changes can a force bring about on a body? Give one example of each.

Important Questions on Force and Laws of Motion

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 2 - Force and Laws of Motion>Exercises>Q D

State the law of conservation of momentum. Explain how this law is valid for

a. recoiling of a gun

b. motion of a rocket

EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 2 - Force and Laws of Motion>Exercises>Q D
State Newton's three laws of motion. Calculate the magnitude of force required to produce an acceleration of 2 m/s2 in a body of mass 12.5 kg.
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 2 - Force and Laws of Motion>Exercises>Q E
What is the acceleration produced by a 12 N force acting on a 6 kg mass?  
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 2 - Force and Laws of Motion>Exercises>Q E
How much is the force acting on a body of mass 5 kg, if it is accelerated by 2 m/s2.
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 2 - Force and Laws of Motion>Exercises>Q E

 A mass of 1000 kg having a speed of 10 m/s is brought to rest over a distance of 100 m. Find

a. the retardation

b. the retarding force.

EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 2 - Force and Laws of Motion>Exercises>Q E
A truck starting from rest moves down a hill with a constant acceleration. If it covers a distance of 300 m in 10 s, find its acceleration. Also find the force acting on it if its mass is 8000 kg.
HARD
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 2 - Force and Laws of Motion>Exercises>Q E
A certain force exerted for 0.5 s raises the speed of an object from 2.4 m/s to 4.9 m/s. Later the same force is applied for 2.5 s. How much does the speed of object change in 2.5 s?
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 2 - Force and Laws of Motion>Exercises>Q E
A dumb-bell of 5 kg mass falls from a height of 0.4 m. What is the momentum transferred by the dumb bell while hitting the ground?