EASY
9th CBSE
IMPORTANT
Earn 100

Why don't the forces of action and reaction cancel each other?

Important Questions on Force and Laws of Motion

MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 2 - Force and Laws of Motion>Summative Assessment Some Solved CBSE Sample Questions>Q 36
Cars are provided with seat belts. Give reason.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 2 - Force and Laws of Motion>Summative Assessment Some Solved CBSE Sample Questions>Q 37
A ball of mass 100 g moving with a velocity of 10 m s-1 is stopped by a boy in 0.25 s. Calculate the force applied by the boy to stop the ball.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 2 - Force and Laws of Motion>Summative Assessment Some Solved CBSE Sample Questions>Q 38
Is momentum a scalar or vector quantity?
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 2 - Force and Laws of Motion>Summative Assessment Some Solved CBSE Sample Questions>Q 39
A body of mass 'm' is moving with velocity 'u'. When a force is applied on it for time 't' its velocity increases to 'v'. Write expressions for initial and final momentum. Also write its SI unit.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 2 - Force and Laws of Motion>Summative Assessment Some Solved CBSE Sample Questions>Q 39
A body of mass 'm' is moving with velocity 'u'. When a force is applied on it for time 't' its velocity increases to 'v'. Write expressions for change in momentum. Also write its SI unit.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 2 - Force and Laws of Motion>Summative Assessment Some Solved CBSE Sample Questions>Q 39
A body of mass 'm' is moving with velocity 'u'. When a force is applied on it for time 't' its velocity increases to 'v'. Write expressions for rate of change of momentum. Also write its SI unit.
HARD
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 2 - Force and Laws of Motion>Summative Assessment Some Solved CBSE Sample Questions>Q 40
Total momentum of two bodies remains unchanged before and after the collision. Justify this statement.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 2 - Force and Laws of Motion>Summative Assessment Some Solved CBSE Sample Questions>Q 41
A constant force acts on an object mass 5 kg for a duration of 2 s. It increases the object's velocity from 3 m s-1 to 7 m s-1. Find the magnitude of the force applied. Now if the force were applied for a duration of 5 s, what would be the final velocity of the object?