Physics Part 1

Work Energy and power NCERT Exercises Question 1.The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:(a) work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.(b) work done by […]

Laws of motion NCERT Exercises Question 1.[For simplicity in numerical calculations, take g= 10 m s-2]Give the magnitude and direction of the net force acting on(a) a drop of rain falling down with a constant speed,(b) a cork of mass 10 g floating on water,(c) a kite skillfully held stationary in the sky,(d) a car

Motion in a plane NCERT Exercises Question 1.State, for each of the following physical quantities, if it is a scalar or a vector: volume, mass, speed, acceleration, density, number of moles, velocity, angular frequency, displacement, angular velocity. Answer:Scalars : volume, mass, speed, density, number of moles, angular frequency.Vectors: Acceleration, velocity, displacement, angular velocity. Question 2.Pick out the

Motion in a Straight Line NCERT Exercises Question 1.In which of the following examples of motion, can the body be considered approximately a point object:(a) a railway carriage moving without jerks between two stations.(b) a monkey sitting on top of a man cycling smoothly on a circular track.(c) a spinning cricket ball that turns sharply

Units and Measurements Question 1.Fill in the blanks(a) The volume of a cube of side 1 cm is equal to ….m3.(b) The surface area of a solid cylinder of radius 2.0 cm and height 10 cm is equal to ….(mm)2.(c) A vehicle moving with a speed of 18 km h-1 … m in 1 s.(d) The

Physical World NCERT Exercises Question 1.Some of the most profound statements on the nature of science have come from Albert Einstein, one of the greatest scientists of all time. What do you think did Einstein mean when he said :”The most incomprehensible thing about the world is that it is comprehensible”? Answer:The physical world, when