11th Physics Weekly Test - 2 ( Work, Energy and Power )

MABS Institution

11th Physics Weekly Test - 2 ( Work, Energy and Power )-Aug 2020

Time : 1.30 Hours

Part - A

Generic 2 - Answer All Question

State the factors on which the work done by the force depends on.

Two bodies stick together after the collision. What type of collision is in between these two bodies?

A body of mass 5 kg is thrown up vertically with a kinetic energy of 1000 J. If acceleration due to gravity is 10 ms^-1, find the height at which the kinetic energy becomes half of the original value.

Draw a graph showing the variation of potential energy of an object thrown vertically upward by a boy with respect to its height.

A spark is produced, when two stones are struck against each other. Why?

Two different unknown masses A and B collide. A is initially at rest when B has a speed v. After collision B has a speed v/2 and moves at right angles to its original direction of motion. Find the direction in which A moves after collision

Define the term energy. What are its units and dimensions?

(i) Can Kinetic energy of a system be changed without changing its momentum?
(ii) Can momentum of a system be changed without changing its kinetic energy? Give example.

Why does a pilot not fall down, when his aeroplane loops a vertical loops?

Define Potential energy. Write the expression of it.

Part - B

Generic 5 - Answer All Question

Find the work done in moving a particle along a vectors \(\vec { s } =(\overset { \wedge }{ i } -2\overset { \wedge }{ j } +3\overset { \wedge }{ k } )\)m if applied force is \(\vec { F } =(2\overset { \wedge }{ i } -3\overset { \wedge }{ j } +4\overset { \wedge }{ k } )\)N.

A 10kg ball and 20kg ball approach each other with velocities 20 ms^-1 and 10 ms^-1 respectively. What are their velocities after collision if the collision is perfectly elastic?

A large and small vehicle moving with the some kinetic energy on a straight road. Their engine are simultaneously OFF. Which one will stop at a longer distance?
Find the work done in pulling and pushing another though 200 m horizontally when a force of 1000N is acting along a chain making an angle of 60° with ground. Assume the floor to be smooth friction less surface.

Arrive at an expression for power and velocity. Give some examples for the same.

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11th Physics Weekly Test - 2 ( Work, Energy and Power )

MABS Institution

11th Physics Weekly Test - 2 ( Work, Energy and Power )-Aug 2020

Part - A

Generic 2 - Answer All Question

State the factors on which the work done by the force depends on.

Two bodies stick together after the collision. What type of collision is in between these two bodies?

A body of mass 5 kg is thrown up vertically with a kinetic energy of 1000 J. If acceleration due to gravity is 10 ms-1, find the height at which the kinetic energy becomes half of the original value.

Draw a graph showing the variation of potential energy of an object thrown vertically upward by a boy with respect to its height.

A spark is produced, when two stones are struck against each other. Why?

Two different unknown masses A and B collide. A is initially at rest when B has a speed v. After collision B has a speed v/2 and moves at right angles to its original direction of motion. Find the direction in which A moves after collision

Define the term energy. What are its units and dimensions?

(i) Can Kinetic energy of a system be changed without changing its momentum? (ii) Can momentum of a system be changed without changing its kinetic energy? Give example.

Why does a pilot not fall down, when his aeroplane loops a vertical loops?

Define Potential energy. Write the expression of it.

Part - B

Generic 5 - Answer All Question

Find the work done in moving a particle along a vectors \(\vec { s } =(\overset { \wedge }{ i } -2\overset { \wedge }{ j } +3\overset { \wedge }{ k } )\)m if applied force is \(\vec { F } =(2\overset { \wedge }{ i } -3\overset { \wedge }{ j } +4\overset { \wedge }{ k } )\)N.

A 10kg ball and 20kg ball approach each other with velocities 20 ms-1 and 10 ms-1 respectively. What are their velocities after collision if the collision is perfectly elastic?

A large and small vehicle moving with the some kinetic energy on a straight road. Their engine are simultaneously OFF. Which one will stop at a longer distance?

Find the work done in pulling and pushing another though 200 m horizontally when a force of 1000N is acting along a chain making an angle of 60° with ground. Assume the floor to be smooth friction less surface.

Arrive at an expression for power and velocity. Give some examples for the same.

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A body of mass 5 kg is thrown up vertically with a kinetic energy of 1000 J. If acceleration due to gravity is 10 ms^-1, find the height at which the kinetic energy becomes half of the original value.

(i) Can Kinetic energy of a system be changed without changing its momentum?
(ii) Can momentum of a system be changed without changing its kinetic energy? Give example.

A 10kg ball and 20kg ball approach each other with velocities 20 ms^-1 and 10 ms^-1 respectively. What are their velocities after collision if the collision is perfectly elastic?