# Motion questions and answers pdf

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Published: 02.05.2021  Here you can find Important Motion Question for class 9 and all upcoming government job exam. Ans- Rest. Running car is the example of? Ans- Motion.

October 16, Class 11 - Physics. Which component of linear momentum does not contribute to angular momentum? Radial component of linear momentum. What is the cause and outcome in a rotational motion? Cause of rotational motion — Torque Out come in rotational motion — Angular momentum. Is it possible to open a pen up with one finger? A rifle barrel has a spiral groove which imparts spin to the bullet.

Angular momentum gained by the bullet provides better accuracy. For uniform circular motion, does the direction of the centripetal force depend on the sense of rotation i. No, direction of centripetal force remains constant either it is clockwise and anticlockwise rotation.

If a body is rotating, is it necessarily being acted upon by an external torque? No, torque is required only for producing angular acceleration. For uniform rotation, no torque is needed. A projectile acquires angular momentum about the point of projection during flight.

Does it violate the conservation of angular momentum? Give the physical significance of moment of inertia? The moment of inertia plays the same role in rotational motion as the mass does in linear motion. Yes, moment of inertia of a body changes with the change of the axis of rotation.

Is there any difference between moment of inertia and rotational inertia? The moment of inertia is another name for rotational inertia. The moment of inertia is called rotational interia for the reason that it gives the measure of inertia in rotational motion. Why are the spokes fitted in a cycle wheel? Two solid spheres of same mass are made of metals of different densities.

Which of them has a larger moment of inertia about a diameter? A ring and a circular disc of different material have equal masses and equal radii. Which one will have a larger moment of inertia about an axis passing through its centre of mass and perpendicular to its plane? A ring has a larger moment of inertia because its entire mass is at a larger distance from the axis of rotation than the average distance of the mass particles of the disc.

A disc of metal is melted and recast in the form of a solid sphere. What will happen to the moment of inertia about a vertical axis passing through the centre?

The moment of inertia will decrease, because the material particles will, on the average come closer to the axis.

Is friction necessary for a body to roll? If no other external force acts on a body, friction is necessary for a body to roll. Frictional force being tangential provides torque. Any force at the centre of mass will provide no torque and so cannot roll the body. Can a body in translatory motion have angular momentum? Yes, a body in translatory motion shall have angular momentum unless the fixed point about which angular momentum is taken lies on the line of motion of the body.

A planet revolves around a massive star in a highly elliptical orbit. Is its angular momentum constant over the entire orbit?

Yes, angular momentum of the planet is constant over the entire orbit. This is because revolution of planet around the star is under the effect of gravitational force between the star and the planet. This is a radial force whose torque is zero. Therefore, angular momentum of the planet is constant vector , whatever be the nature of the orbit. Assume that there is no mass loss by the star during collapse. A child stands at the centre of a turn table with his two arms outstretched. The turn table is set rotating with an angular speed of 40 r.

Assume that the turn table rotates without friction. How do you account for this increase in K. This is because the child spends internal energy in folding back his hands. What is the angular momentum of the projectile when it is at the highest point about an axis through the point of projection? The perpendicular distance between the point of projection and the highest point. A planet moves around the sun under the effect of gravitational force exerted by the sun.

Why the torque on the planet due to the gravitational force is zero? A tube of length l is filled with a liquid density. Find the force experienced at one of its edge if rotated about the other edge with an angular velocity. Angular velocity will be same for all points. Consider a small portion of length dx at a distance x from the axis.

A grindstone has a moment of inertia. A constant torque is applied and the grindstone is found to have a speed of r. Calculate the torque. The radius of the disc is R. What are the linear velocities of the points A , B and C on the disc shown in fig.

Will the disc roll in the direction indicated? Without friction, rolling is not possible. What is the power of the engine required? In practice, however, a torque has to be applied to the rotor to counterbalance the frictional torque. Explain why friction is necessary to make the disc roll in the direction indicated. To roll a disc, we require a torque, which can be provided only by a tangential force.

As force of friction is the only tangential force in this case, it is necessary. The sense of frictional torque will be perpendicular to the plane of the disc and outwards.

Also, force of friction would become zero at this stage. State the theorems of Parallel axes. State the perpendicular axes theorem. Perpendicular Axes Theorem According to this theorem the sum of moment of inertia of a plane lamina about two mutually perpendicular lying in its plane is equal to its moment of inertia about an axis perpendicular axes to the plane of lamina and passing through the point of intersection of first two axes.

In a fly wheel, most of the mass is concentrated at the rim. Explain, why. Due to this peculiar shape, the flywheel possesses a large value of moment of inertia for the given mass and the radius. If such a wheel gains or loses some rotational energy, it brings about only a very small change in its angular speed. In this way, a flywheel helps to maintain uniform motion.

A rod of length l and mass M held vertically is let go down, without slipping at the point of contact. What is the velocity of the top end at the time of touching the ground? Loss in P. Assuming that no mechanical energy is dissipated in heat, which one will win? Why is it more difficult to revolve a stone by tying it to a longer string than by tying it to a shorter string? Hence, it is more difficult to revolve a stone by tying it to a longer string. Three point mass are located at the vertices of an equilateral triangle of length a.

What is the moment of inertia of the system about an axis along the altitude of the triangle passing through? In fig. The radius of the cylinder is 0. What is the kinetic energy associated with the rotation of the cylinder? What is the magnitude of angular momentum of the cylinder about its axis? What is the moment of inertia of a uniform circular disc of radius R and mass M about an axis passing through its centre and normal to the disc.

A solid cylinder of mass M and radius R is held at rest in a horizontal position. Two strings are wound around the cylinder. As the string gets un-wound, find the tension in the string and acceleration in the cylinder. Explain, why friction is necessary to make the disc roll in the direction indicated. The make the disc roll, a torque is required which in turn requires tangential force on it.

Here, in this problem, only frictional force can provide the tangential force. Therefore, frictional force at the point of contact is in the same direction as the arrow. The act, process or state of the change in place or position of a body with respect to time and relative to the observer is said to be ………………. Which type of motion of an object that moves at a fixed distance from a fixed point? The physical quantities used in displacement both direction and magnitude are called as:. What is mean by the ratio of total displacement to total time taken by the body? Your email address will not be published.

The videos related to each chapters are also available to free download. All the solutions are in updated form for current academic session Speed: Speed of a body is defined as the distance travelled by the body in unit time. Velocity: Velocity of a body is the distance travelled by the body in unit time in a given direction. It is accelerated motion due to change in the direction of motion. When the motion is uniform, the distance-time graph is a straight line with some slope. When the motion is non-uniform, the distance time graph is not a straight line. PDF | Worked Examples on Linear Motion | Questions and Answers on Linear Motion | Find, read and cite all the research you need on ResearchGate.

## Important Questions for CBSE Class 9 Science Chapter 8 - Motion

Very Short Answer Type Questions. Short Answer Type Questions — I. Xam Idea Class 9 Science Solutions is a complete exam preparation textbook for senior secondary classes. Design in accordance with the latest revised CBSE syllabus as well as examination pattern, this Solution aid students in getting higher marks in the exam. The Class 9 Science Solutions are developed by the SelfStudys expert and skilled team of teachers who have huge experience, covering the entire syllabus of the exam.

Click the button below to download the full Mathematics Form 2 Topical Revision Questions and Answers pdf document, with all the topics. This is the most affordable option. HTML code is not allowed. Join our telegram group Download Notes. Share via Whatsapp.

Home Curation Policy Privacy Policy. A comprehensive database of more than 54 motion quizzes online, test your knowledge with motion quiz questions. An object, attached to a 0,5m string, does 4 rotation in one second. Write their names. Answer: Galileo Galilei and Isaac Newton. Practice the multiple choice questions to test understanding of important topics in the chapters. Download latest questions with answers for Physics Circular Motion in pdf free or read online in online reader free.

### motion class 9 questions answers pdf

Thanks for visiting our website. Our aim is to help students learn subjects like physics, maths and science for students in school , college and those preparing for competitive exams. All right reserved. All material given in this website is a property of physicscatalyst. Answer a. After every round, particle comes to it starting position. So displacement at full rounds will be zero S.

Here you can find Important Motion Question for class 9 and all upcoming government job exam. Ans- Rest. Running car is the example of? Ans- Motion. Class 9 Motion Quiz Please wait while the activity loads. If this activity does not load, try refreshing your browser. Also, this page requires javascript.

Higher Equations of Motion Questions. 1. a) State the three equations of motion. b) List the five quantities with their units, which are involved in the three. #### Linear Motion Questions and Answers - Form 2 Topical Mathematics

October 16, Class 11 - Physics. Which component of linear momentum does not contribute to angular momentum? Radial component of linear momentum. What is the cause and outcome in a rotational motion? Cause of rotational motion — Torque Out come in rotational motion — Angular momentum.