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Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it. cbse-class8-physics-20151 AnswerFour children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement. cbse-class8-physics-20151 AnswerWrite an expression for the work done when a force is acting on an object in the direction of its displacement. - Physics Cbse class 11 1 AnswerName the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket do not bring a change in its state of motion. cbse-class8-physics-20152 AnswerA 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). - Physics Cbse class 11 1 AnswerAn archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms. cbse-class8-physics-20151 Answer A student finds the writing on the blackboard as blurred and unclear when sitting on the last desk in the classroom. He however, sees it clearly when sitting on the front desk at an approximate distance of 2m from the blackboard. Draw ray diagrams t1 AnswerA rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad. cbse-class8-physics-20151 AnswerExplain why sliding friction is less than static friction. cbse-class8-physics-20151 AnswerDuring the ground roll manoeuvre of an aircraft, the force(s) acting on it parallel to the direction of motion GATE-Aerospace Engineering-Question-20121 AnswerDescribe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane cbse-class8-physics-20151 AnswerDraw sketches to show the relative positions of prominent stars in (a) Ursa Major and (b) Orion cbse-class8-physics-20151 Answer Give two examples of situations in which applied force causes a change in the shape of an object. cbse-class8-physics-20151 AnswerCertain force acting on a 20 kg mass changes its velocity from 5 m/s to 2 m/ s. Calculate the work done by the force. - Physics Cbse class 11 1 AnswerWhy does a current carrying conductor kept in a magnetic field experience force? what factors does the direction of this force depend? Name and state the rule used for determination of direction of this force. -CBSE physics class 101 AnswerGive examples to show that friction is both a friend and a foe. cbse-class8-physics-20151 AnswerIqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why? cbse-class8-physics-20151 AnswerA blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron? cbse-class8-physics-20151 AnswerAn inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall? cbse-class8-physics-20151 AnswerFor uniform circular motion, does the direction of centripital force depend only on sense of rotation i.e. clockwise or anticlockwise direction? -Physics Cbse class 11 1 Answer