MEDIUM
9th Manipur Board
IMPORTANT
Earn 100

When a hung carpet is beaten with a stick, dust particles come out of it. Explain.

Important Questions on Force and Laws of Motion

MEDIUM
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 7 - Force and Laws of Motion>EXERCISES>Q 9
A truck starting from rest travels down a hill with a constant acceleration. It travels a distance of 300 metres in 15 sec. Calculate its acceleration. Find the force acting on it, if its mass is 10 metric tonnes. (1 metric tonne = 1000 kg)
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 7 - Force and Laws of Motion>EXERCISES>Q 10
A force of 15 N acts on a body of mass 0.5 kg. Find the acceleration of the particle in m s-2.
MEDIUM
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 7 - Force and Laws of Motion>EXERCISES>Q 11
The velocity of a body of mass 125 g changes from 10 ms to 5 ms in 5 second. Assuming that a constant force acts on it, find the magnitude of the force.
MEDIUM
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 7 - Force and Laws of Motion>EXERCISES>Q 12
A coin of mass 25 g is pushed on a table. The coin starts moving at speed of 25 cms-1 and stops in 5 s. Find the force of friction exerted by the table on the coin.
MEDIUM
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 7 - Force and Laws of Motion>EXERCISES>Q 13
A hockey ball of mass 200 g travelling at 10 ms-1 is struck by a hockey stick so as to return it along its original path with a velocity of 5 ms-1. Calculate the change in momentum that occurred in the motion of the ball by the force applied by the hockey stick.
MEDIUM
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 7 - Force and Laws of Motion>EXERCISES>Q 14
A horizontal force of 200 N is required to move a wooden cabinet across a floor at a constant velocity. Calculate the friction force exerted on the cabinet.
MEDIUM
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 7 - Force and Laws of Motion>EXERCISES>Q 15
Two bodies having each of mass 2 kg are moving in the same straight line but in opposite directions. The velocity of each before collision is 3 ms-1. In the collision, they stick together. What will be the velocity of the combined body after collision?
MEDIUM
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 7 - Force and Laws of Motion>EXERCISES>Q 16
A sharp object of mass 0.5 kg travelling horizontally at a velocity of 100 ms-1 strikes a stationary wooden block of mass 2.5 kg. Therefore, the two move together in the same straight line. Calculate the total momentum before and after the impact. Also, calculate the velocity of the combined system.