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Free CBSE - Class 9 Science - Force and Laws of Motion worksheets

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1.

A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because

1.

the batsman did not hit the ball hard enough.

2.

velocity is proportional to the force exerted on the ball.

3.

there is a force on the ball opposing the motion.

4.

there is no unbalanced force on the ball, so the ball would want to come to rest.

2.
A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tonnes (Hint: 1 tonne = 1000 kg.)
3.
A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate: (a) the net accelerating force
4.
Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?
5.
According to the third law of motion when we push on an object, the object pushes back on us with an equal and opposite force. If the object is a massive truck parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal forces cancel each other. Comment on this logic and explain why the truck does not move.
6.
A hockey ball of mass 200 g travelling at 10 $m s^{-1}$ is struck by a hockey stick so as to return it along its original path with a velocity at 5 $m s^{-1}$. Calculate the magnitude of change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.
7.
A bullet of mass 10 g travelling horizontally with a velocity of 150 $m s^{-1}$ strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. Also calculate the magnitude of the force exerted by the wooden block on the bullet.
8.
An object of mass 1 kg travelling in a straight line with a velocity of 10 $m s^{-1}$ collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.
9.
An object of mass 100 kg is accelerated uniformly from a velocity of 5 $m s^{-1}$ to 8 $m s^{-1}$ in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.
10.
Akhtar, Kiran and Rahul were riding in a motorcar that was moving with a high velocity on an expressway when an insect hit the windshield and got stuck on the windscreen. Akhtar and Kiran started pondering over the situation. Kiran suggested that the insect suffered a greater change in momentum as compared to the change in momentum of the motorcar (because the change in the velocity of the insect was much more than that of the motorcar). Akhtar said that since the motorcar was moving with a larger velocity, it exerted a larger force on the insect. And as a result the insect died. Rahul while putting an entirely new explanation said that both the motorcar and the insect experienced the same force and a change in their momentum. Comment on these suggestions.
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Top Tutors who teach CBSE - Class 9 Science Force and Laws of Motion

Dr gulsaz Shamim Force and Laws of Motion in Ranchi
(45)
superTutorSuper Tutor
locationImg Lalpur, Ranchi
9 yrs of Exp students 15 students
2287 hrs of classes completed
rsIcon 500 per hour
Certified Science teacher with more than 10 years of experience in teaching and research
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Abdullah Sufiyan

Dr. Gulsaz is an excellent teacher. She explains the concepts in a way that is easy for the child to understand, she gives them also some extra fun facts. Furthermore she also uses diagrams to explain challenging concepts. Abdullah enjoys her classes and has shown great improvement in his understanding of the concepts and applications as well. I would recommend her definitely

Skills: Biology , Science

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superTutorSuper Tutor
locationImg Sector 92, Gurgaon
20 yrs of Exp students 20 students
1298 hrs of classes completed
rsIcon 800 per hour
Teaching mathematics since last 20 years. Doing research on Vedic mathematics
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Ramu Nutakki

Very patient. Makes learning fun and productive. A seasoned and competent teacher. Makes a subject as mind-bogging as Math very easy to understand. Awesome experience!

Skills: Mathematics , Physics and more

Sai V. Force and Laws of Motion in Madappanahalli
(141)
superTutorSuper Tutor
locationImg Itagalpura Main Rd, Madappanahalli
17 yrs of Exp students 44 students
3536 hrs of classes completed
rsIcon 400 per hour
MSc, BEd , (Phd), Member of Royal Society UK
Online Classes Online Classes
Vijayalakshmi

He is not fit to be a teacher. Used our money but not taken the class as promised. Despite spoken multiple times of our expectations, half of the class he focuses on offline class and didn't focus on online class.

Skills: Mathematics , Physics and more

(61)
superTutorSuper Tutor
locationImg Sector 5, Dwarka, Delhi
10 yrs of Exp students 33 students
1176 hrs of classes completed
rsIcon 500 per hour
10 Yrs in Teaching, Conduct Batch Of Two Kids, One-to-One classes. ShortTermPrep & LongTermClasses.
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Skills: Mathematics , Physics and more

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