Question

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NUMERICALS

1. A200kg motorcycle is moving over a horizontal road with uniform velocity. If this motorcycle has to be stopped with a negative acceleration of 1.5m/s2 , hen what is the force of friction between the tyre of the motorcycle and the road?  

2. An iron sphere of 1kg is moving a velocity of 20m/s on a cemented floor. It comes to rest after traveling a distance of 50 m. Find the force of friction between the sphere and the floor.  

3. A ball of mass 100g moving with a velocity of 0m/s is stopped by a boy in 0.2s. Calculate the force applied by the boy to stop the ball.  

4. A car weighing 2400 kg and moving with a velocity of 20 m/s is stopped in 10s on applying breaks. Calculate the retardation and retarding force?  

5. A car of mass 1000kg and a bus of mass 8000kg are moving with the same velocity of 36 km/h. Find the forces to stop both the car and the bus in 5s.  

6. A mechanic strikes a nail with a hammer of mass 500g moving with a velocity of 20m/s The hammer comes to rest in 0.02s.after striking the nail. Calculate the force exerted by the nail on the hammer.  

7. A bullet of mass 10g traveling with a velocity of 100 m/s penetrates in a wooden plank and is brought to rest in 0.01s Find (a) the distance through which the bullet penetrates in the wooden plank and (b) the force exerted on the bullet.  

8. A bullet of mass 100g is fired from a gun of mass 20 kg with a velocity of 100m/s. Calculate the velocity of recoil of the gun.  

9. Two bodies each of mass 1kg are moving in a straight line but opposite in direction with the same velocity of 2m/s. They collide with each other and stick to each other after collision. What is the common velocity of these bodies after collision?

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Answer 1

Answer:

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Explanation:

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