ASSIGNMENT PHYSICS CLASS IX SESSION 2017-18
FOR PT-I
Q1.The odometer of a car reads 2000km at the start of a trip and 2400km at the end of the trip. If the trip took 8h.Calculate average speed of the car in km/hr and m/s.
Q2.Starting from rest, Ravi paddles his cycle to attain a velocity of 6m/s in 30s.Then he applies brakes such that the velocity of the cycle comes down to 4m/s in next 5s.Calculate the acceleration of the cycle in both cases.
Q3.An object starting from rest travels 20m in first 2s and 160m in next 4s.What will be the velocity after 7s from the start.
Q4.Derive second equation of motion graphically.
Q5.The velocity time graph of a body is a straight line parallel to the time axis. What does it signify ?
Q6.What is represented by area under velocity time graph of a body ?
Q7.An object is dropped from rest at a height of 150m and simultaneously another object is dropped from rest at a height 100m.What is the difference in their height after 2s if both objects drop with same acceleration ?How does the difference in heights vary with time?
Q8.Describe in brief an activity to illustrate the property of inertia of rest.
Q9.State Newton’s first law of motion.
Q10.Why it is advised to tie luggage kept on the roof of a bus ?
FOR PT-II ( MID-TERM)
Q1.Derive the mathematical relation of Newton’s second law of motion.
Q2.Describe walking in terms Newton’s third law of motion.
Q3.Derive the mathematical formula of conservation of momentum.
Q4.A force of 5N produces acceleration of 8m/s2 on a mass of m1 and an acceleration of 24m/s2 on a mass of m2.What acceleration would the same force provide if both masses tied together ?
Q5.A cracker of mass 100g explodes into two pieces of equal masse. Show that thesetwo pieces of the cracker fly in opposite direction.
Q6.A man throwsa ball of mass 0.4kg vertically upwards with a velocity of 10m/s. What will be its initial momentum? What would be its momentum at the highest point of its reach ?
Q7.State the universal law of gravitation
Q8.How does the force of gravitation between two objects change when the distance between them is reduced to half ?
Q9.Why is the weight of an object on the moon 1/6th its weight on earth ?
Q10.The earth is acted upon gravitation of sun,even though it does not fall into the sun .Why ?
Q11.Suppose that radius of earth becomes twice of its original radius without any change in its mass. Then what will happen to your weight ?
Q12.Give differences between acceleration due to gravity (g) and universal gravitational constant(G).
Q13.Why does a body reach the ground quicker at poles than at the equator when dropped from the same height ?
Q14.When does an object show weightlessness ?