📄 GuideYou may have seen a ball roller coaster exhibit (Fig.). Describe how kinetic and potential energy. Class 9
You may have seen a ball roller coaster exhibit (Fig.). Describe how kinetic and potential energy. C
📄 GuideFor the situation depicted in Fig., calculate the mechanical energy of the ball. Class 9
For the situation depicted in Fig., calculate the mechanical energy of the ball. Class 9Question 1.
📄 GuideDoes the kinetic energy of an object which moves with constant velocity. Class 9
Does the kinetic energy of an object which moves with constant velocity. Class 9Question 1. Does the
📄 GuideWhen you pedal a bicycle on a flat road, your muscles supply energy. Class 9
When you pedal a bicycle on a flat road, your muscles supply energy. Class 9(Page 121)Question 1. Wh
📄 GuideIn the previous chapter, a weightlifter is shown holding a barbell steady. Class 9
In the previous chapter, a weightlifter is shown holding a barbell steady. Class 9Pause and Ponder (
📄 GuideWhat will be the magnitude of velocity of the child at the bottom of the blue slide? Class 9
What will be the magnitude of velocity of the child at the bottom of the blue slide? Class 9Think It
📄 GuideFor a seesaw with four seats A,B,D,E and fulcrum at C, AC = EC = 2 m and BC = DC = 1 m. Class 9
For a seesaw with four seats A,B,D,E and fulcrum at C, AC = EC = 2 m and BC = DC = 1 m. Class 9Quest
📄 GuideActivity 7.5 Let us experiment to verify the law of levers using a beam balance with coins. Class 9
Activity 7.5 Let us experiment to verify the law of levers using a beam balance with coins. Class 9A
📄 GuideActivity 7.4 Let us investigate to demonstrate how a lever can lift a heavier object. Class 9
Activity 7.4 Let us investigate to demonstrate how a lever can lift a heavier object. Class 9Activit
📄 GuideA person uses an inclined ramp of length 50 cm to raise an object. Class 9
A person uses an inclined ramp of length 50 cm to raise an object. Class 9Question 1.A person uses a
📄 GuideActivity 7.3 Let us experiment determine if an inclined plane reduces the force. Class 9
Activity 7.3 Let us experiment determine if an inclined plane reduces the force. Class 9Activity 7.3
📄 GuideRamesh lifts 75 kg of water by 2 m in 5 s. How much power is required for this task? Class 9
Ramesh lifts 75 kg of water by 2 m in 5 s. How much power is required for this task? Class 9Question
📄 GuideAn elevator can carry a maximum load of 1800 kg and move up with a constant speed. Class 9
An elevator can carry a maximum load of 1800 kg and move up with a constant speed. Class 9Question 1
📄 GuideActivity 7.2 Let us experiment to demonstrate conservation of mechanical energy. Class 9
Activity 7.2 Let us experiment to demonstrate conservation of mechanical energy. Class 9Activity 7.2
📄 GuideA cricketer throws a ball of mass 200 g high up in the air to height of 10 m. Class 9
A cricketer throws a ball of mass 200 g high up in the air to height of 10 m. Class 9Question 1. A c
📄 GuideActivity 7.1 Let us investigate to study the relationship between the height. Class 9
Activity 7.1 Let us investigate to study the relationship between the height. Class 9Activity 7.1 Le
📄 GuideAn aircraft of mass 1500 kg lands on the deck of an aircraft carrier. Class 9
An aircraft of mass 1500 kg lands on the deck of an aircraft carrier. Class 9Question 1.An aircraft
📄 GuideIf velocity of vehicle doubles in magnitude, what will be its finial kinetic energy. Class 9
If velocity of vehicle doubles in magnitude, what will be its finial kinetic energy. Class 9Question
📄 GuideIn carrom, player struck the shot with striker to pocket the black coin. Class 9
In carrom, player struck the shot with striker to pocket the black coin. Class 9Question 1. In carro
📄 GuideA boy lifts a dumbbell and lowers it down. When the boy does positive work. Class 9
A boy lifts a dumbbell and lowers it down. When the boy does positive work. Class 9Question 1. A boy
📄 GuideIn the graph below, force on an object is plotted on y axis. Class 9
In the graph below, force on an object is plotted on y axis. Class 9Question 1.In the graph below, f
📄 GuideWhen the pole of a bar magnet is brought close to a magnetic compass. Class 9
When the pole of a bar magnet is brought close to a magnetic compass. Class 9Question 1. When the po
📄 GuideA tractor pulls a harrow (a ploughing tool) of mass m1 with a net force F. Class 9
A tractor pulls a harrow (a ploughing tool) of mass m1 with a net force F. Class 9Question 1. A trac
📄 GuideAn ace footballer converted a penalty shot by kicking the football. Class 9
An ace footballer converted a penalty shot by kicking the football. Class 9Question 1. An ace footba
📄 GuideThe velocity-time graph of an object of mass 10 kg moving along a straight line. Class 9
The velocity-time graph of an object of mass 10 kg moving along a straight line. Class 9Question 1.
📄 GuideThe acceleration mass graph for the acceleration produced by a force on objects. Class 9
The acceleration mass graph for the acceleration produced by a force on objects. Class 9Question 1.
📄 GuideA hand cart loaded with vegetables collides with an identical but empty hand cart. Class 9
A hand cart loaded with vegetables collides with an identical but empty hand cart. Class 9Question 1
📄 GuideA sailor jumps out from a small boat to the shore (Fig.). Class 9
A sailor jumps out from a small boat to the shore (Fig.). Class 9Question 1. A sailor jumps out from
📄 GuideThe position-time graph for four objects A, B, C and D moving along a straight line. Class 9
The position-time graph for four objects A, B, C and D moving along a straight line. Class 9Question
📄 GuideWhen a net force acts on an object, we observe that the object accelerates: Class 9
When a net force acts on an object, we observe that the object accelerates: Class 9Question 1. When
📄 GuideTwo blocks P and Q on a smooth horizontal surface are shown in Fig. (a) and (b). Class 9
Two blocks P and Q on a smooth horizontal surface are shown in Fig. (a) and (b). Class 9Question 1.
📄 GuideUsing a horizontal force F, a table is moved across the floor at a constant velocity. Class 9
Using a horizontal force F, a table is moved across the floor at a constant velocity. Class 9Revise,
📄 GuideWhy does a fireperson sometimes struggle when holding the pipe issuing water? Class 9
Why does a fireperson sometimes struggle when holding the pipe issuing water? Class 9(Page 110)Quest
📄 GuideTwo children of different masses are sitting on identical swings. Class 9
Two children of different masses are sitting on identical swings. Class 9Question 1. Two children of
📄 GuideIn the real world, it is difficult to find a situation where no forces are acting on an object. Class 9
In the real world, it is difficult to find a situation where no forces are acting on an object. Clas
📄 GuideAn object is moving with a constant velocity. Is there a net force acting upon it? Class 9
An object is moving with a constant velocity. Is there a net force acting upon it? Class 9(Page 101)
📄 GuideA weightlifter lifts a barbell (Fig.). List two forces that are acting on the barbell. Class 9
A weightlifter lifts a barbell (Fig.). List two forces that are acting on the barbell. Class 9Pause
📄 GuideWhy does a canoe move forward when the canoeist pushes water backwards with the paddle? Class 9
Why does a canoe move forward when the canoeist pushes water backwards with the paddle? Class 9Think
📄 GuideA man pushes a box of mass 50 kg with a force of 80 N. Class 9
A man pushes a box of mass 50 kg with a force of 80 N. Class 9Question 1.A man pushes a box of mass
📄 GuideActivity 6.7 Let us understand to demonstrate the Newton's Third Law of Motion. Class 9
Activity 6.7 Let us understand to demonstrate the Newton's Third Law of Motion. Class 9Activity 6.7
📄 GuideActivity 6.6 Let us verify that action and reaction forces are equal in magnitude. Class 9
Activity 6.6 Let us verify that action and reaction forces are equal in magnitude. Class 9Activity 6
📄 GuideActivity 6.5 Let us explore to see two objects exert opposite force on each other. Class 9
Activity 6.5 Let us explore to see two objects exert opposite force on each other. Class 9Activity 6
📄 GuideActivity 6.4 Let us experiment to see the relation been mass and acceleration for a given force. Class 9
Activity 6.4 Let us experiment to see the relation been mass and acceleration for a given force. Cla
📄 GuideActivity 6.3 Let us experiment to see the impact of applied force on acceleration of object. Class 9
Activity 6.3 Let us experiment to see the impact of applied force on acceleration of object. Class 9
📄 GuideA car of mass 1500 kg is moving towards east and its velocity time graph. Class 9
A car of mass 1500 kg is moving towards east and its velocity time graph. Class 9Question 1. A car o
📄 GuideA weightlifter lifts a bar with mass of 10 kg fixed on each side of bar. Class 9
A weightlifter lifts a bar with mass of 10 kg fixed on each side of bar. Class 9Question 1. A weight
📄 GuideActivity 6.2 To Measure the Force of Friction. Class 9
Activity 6.2 To Measure the Force of Friction. Class 9Activity 6.2 To Measure the Force of FrictionA
📄 GuideActivity 6.1 Let us investigate to see the difference in force of friction of different surfaces. Class 9
Activity 6.1 Let us investigate to see the difference in force of friction of different surfaces. Cl
📄 GuideTwo forces of 10 N and 6 N are acting on block on the table as shown in figure. Class 9
Two forces of 10 N and 6 N are acting on block on the table as shown in figure. Class 9Question 1. T
📄 GuideIdentify the separation technique marked as ‘S’. Label the apparatus A, B and C. Class 9
Identify the separation technique marked as ‘S’. Label the apparatus A, B and C. Class 9Question 1.E