MEDIUM
9th CBSE
IMPORTANT
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Why do the blades of an electric fan continue to rotate for some time after the current is switched off?

Important Questions on Force and Laws of Motion

MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>Check Point 02>Q 1
Name the physical quantity whose SI unit is kg m s-1 and write the formula of that quantity.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>Check Point 02>Q 2
If the ball is moving with certain velocity v is reduced to half, then what will be the changes in the values of initial and final momentum?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>Check Point 02>Q 2
If the ball is moving with certain velocity v is reduced to half, then what will be the changes in the values of change of momentum?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>Check Point 02>Q 3
A car is moving with velocity 108 km h-1. If driver of the car want to change its velocity from 108 km h-1 to 90 km h-1 in two minutes. Mass of the car is 300kg. What force applied by the brakes on the tyres?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>Check Point 02>Q 4
Define the term impulse.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>Check Point 02>Q 5
A force of 50 N acts on a body for 110 s. Find the change in the momentum of the body.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>Check Point 03>Q 1
You are hurt when you kick a stone. Why?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>Check Point 03>Q 2
Which law of Newton is associated with propulsion of rocket?