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Physics XI Notes

Physics XI Notes

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A body is moving in a circular path with constant speed. Is this motion a simple harmonic?

A body is moving in a circular path with constant speed. Is this motion a simple harmonic?

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If a pendulum clock is taken to a mountain top, does it gain or lose time?

If a pendulum clock is taken to a mountain top, does it gain or lose time?

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What is the counterpart of the mass and force in rotational motion?

What is the counterpart of the mass and force in rotational motion?

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First law of thermodynamics- Old is Gold

First law of thermodynamics- Old is Gold

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What will happen to the value of ‘g’ if the earth stops rotating?

What will happen to the value of ‘g’ if the earth stops rotating?

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If the sun somehow collapsed to form a black hole, what effect would this event have on the orbit of the earth?

If the sun somehow collapsed to form a black hole, what effect would this event have on the orbit of the earth?

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The earth moving round the sun actes upon by a force, the work on earth by this force. Do you agree with this statement?

The earth moving round the sun actes upon by a force, the work on earth by this force. Do you agree with this statement?

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3. Explain why a cricketer moves his hands backwards while catching ball?

3. Explain why a cricketer moves his hands backwards while catching ball?

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How does ‘g’ at a point vary with distance from the centre of the earth? Where is the highest value of ‘g’? Explain.

How does ‘g’ at a point vary with distance from the centre of the earth? Where is the highest value of ‘g’? Explain.

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A dancer girl is rotating over a turntable with her arms outstretched. If she lowers her arms how does this affect her motion?

A dancer girl is rotating over a turntable with her arms outstretched. If she lowers her arms how does this affect her motion?

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Explain why spokes are fitted in the cycle wheel.

Explain why spokes are fitted in the cycle wheel.

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Explain why a cyclist bend while going along curved road?

Explain why a cyclist bend while going along curved road?

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Steel balls sink in water but they don’t sink in mercury. Why?

Steel balls sink in water but they don’t sink in mercury. Why?

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Refraction at plane surfaces- Old is Gold

Refraction at plane surfaces- Old is Gold

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If a moving bullet striking a block of wood on a frictionless table embeds inside it what happens to the KE of the bullet?

If a moving bullet striking a block of wood on a frictionless table embeds inside it what happens to the KE of the bullet?

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What do you understand by viscosity?

What do you understand by viscosity?

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Lenses – Old is Gold

Lenses – Old is Gold

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Surface Tension-Old is Gold

Surface Tension-Old is Gold

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Why a wrench of longer arm is preferred in comparison to a wrench of short arm?

Why a wrench of longer arm is preferred in comparison to a wrench of short arm?

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Explain why the moon has no atmosphere?

Explain why the moon has no atmosphere?

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Explain which one is more elastic- rubber or steel.

Explain which one is more elastic- rubber or steel.

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What is meant by elastic and inelastic collision?

What is meant by elastic and inelastic collision?

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Can a body be regarded in a state of rest as well as in motion at the same time? Give an example.

Can a body be regarded in a state of rest as well as in motion at the same time? Give an example.

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Why bridges are declared unsafe after a long use?

Why bridges are declared unsafe after a long use?

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Why is the kinetic friction less than the limiting friction?

Why is the kinetic friction less than the limiting friction?

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State the laws of flotation.

State the laws of flotation.

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Why is Glycerine more viscous than water?

Why is Glycerine more viscous than water?

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How does K.E. of an object change if its momentum is doubled?

How does K.E. of an object change if its momentum is doubled?

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When a bus takes a turn, passengers are thrown away from the centre of the curved path. Why?

When a bus takes a turn, passengers are thrown away from the centre of the curved path. Why?

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Thermal Properties of Matter- Old is Gold

Thermal Properties of Matter- Old is Gold

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Refraction through prisms- Old is Gold

Refraction through prisms- Old is Gold

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A solid tied at the end of a string is revolved in vertical. At what point the tension in the string will be the greatest?

A solid tied at the end of a string is revolved in vertical. At what point the tension in the string will be the greatest?

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Capacitance and dielectrics- Old is Gold

Capacitance and dielectrics- Old is Gold

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A cork is floating in water. What is the apparent weight of the cork?

A cork is floating in water. What is the apparent weight of the cork?

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Photometry- Old is Gold

Photometry- Old is Gold

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Kinematics-Old is Gold

Kinematics-Old is Gold

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Why is easier to lift a body in a liquid than in air?

Why is easier to lift a body in a liquid than in air?

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Why an astronaut in a space capsule orbiting the earth experiences a feeling of weightlessness?

Why an astronaut in a space capsule orbiting the earth experiences a feeling of weightlessness?

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Is it possible for a solid body to have no matter at it centre of gravity?

Is it possible for a solid body to have no matter at it centre of gravity?

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Reflection at curved mirrors- Old is Gold

Reflection at curved mirrors- Old is Gold

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Second Law of Thermodynamics- Old is Gold

Second Law of Thermodynamics- Old is Gold

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During pregnancy, woman often develop back pains from leaning backward while walking. Why do they have to walk this way?

During pregnancy, woman often develop back pains from leaning backward while walking. Why do they have to walk this way?

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What is the difference between centre of gravity and centre of mass of a system?

What is the difference between centre of gravity and centre of mass of a system?

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Why does ice float in water?

Why does ice float in water?

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Why is a horse more stable than a man?

Why is a horse more stable than a man?

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Distinguish between conservative and non-conservative force.

Distinguish between conservative and non-conservative force.

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How will you justify that stone is more rigid than iron?

How will you justify that stone is more rigid than iron?

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Heat and Temperature- Old is Gold

Heat and Temperature- Old is Gold

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Quantity of Heat- Old is Gold

Quantity of Heat- Old is Gold

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Viscosity-Old is Gold

Viscosity-Old is Gold

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Work

Work

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Differentiate between conservation of kinetic energy and conservation of linear momentum.

Differentiate between conservation of kinetic energy and conservation of linear momentum.

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Is friction a necessary evil? Explain.

Is friction a necessary evil? Explain.

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In a siphon, water is lifted above its level during flow from container to another, where does it needed potential energy from?

In a siphon, water is lifted above its level during flow from container to another, where does it needed potential energy from?

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Why is it difficult to run fast on sand?

Why is it difficult to run fast on sand?

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A helium filled balloon rises to a certain height and then halts. Why?

A helium filled balloon rises to a certain height and then halts. Why?

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Dispersion- Old is Gold

Dispersion- Old is Gold

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The leaves fall when a tree is shaken. Give reason.

The leaves fall when a tree is shaken. Give reason.

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Why is the bottom of a ship made heavy?

Why is the bottom of a ship made heavy?

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If the earth is struck by meteorites, the earth will slow down slightly. Why?

If the earth is struck by meteorites, the earth will slow down slightly. Why?

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