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Q1. A moving object mainly possesses:
A moving object possesses kinetic energy because kinetic energy is the energy associated with motion. The faster an object moves, the more kinetic energy it has.
Q2. An object raised to a greater height can:
An object raised to a greater height has more gravitational potential energy. This means it can do more work when it falls because more energy is available to be converted into kinetic energy.
Q3. James Prescott Joule was a:
James Prescott Joule was a British physicist who made significant contributions to the study of energy, heat, and thermodynamics. The SI unit of energy and work is named after him.
Q4. The unit of energy and work is named after:
The SI unit of energy and work is the joule (J), named after the British physicist James Prescott Joule for his contributions to the study of energy and thermodynamics.
Q5. Joule verified experimentally the law of:
James Prescott Joule conducted experiments that helped establish the law of conservation of energy. He showed that energy can be converted from one form to another but cannot be created or destroyed.
Q6. Increasing mass while keeping velocity same will:
Kinetic energy = ½mv². If mass increases while velocity remains constant, kinetic energy increases proportionally because mass is directly proportional to kinetic energy.
Q7. When initial velocity is zero, work done equals:
Work-energy theorem states that work done = change in kinetic energy = ½mv² – ½mu². When initial velocity u = 0, work done = ½mv².
Q8. A stationary object at height possesses:
A stationary object at a height has gravitational potential energy due to its position. It does not have kinetic energy because it is not moving.
Q9. If an object starts from rest, its initial velocity is:
When an object starts from rest, its initial velocity u = 0 m/s. This is a common condition in many physics problems.
Q10. When a trolley displaces a block, it means:
When a trolley moves a block, the trolley applies force on the block and the block is displaced. This means work is done on the block.
Q11. A moving trolley hitting a wooden block shows that:
When a moving trolley hits a block, kinetic energy from the trolley is transferred to the block, causing it to move. This demonstrates energy transfer.
Q12. The depth of depression made by a falling ball depends on:
The depth of depression in sand caused by a falling ball depends on its kinetic energy at impact, which depends on the height from which it falls (more height = more kinetic energy).
Q13. Work done is equal to:
According to the work-energy theorem, the work done on an object is equal to the change in its kinetic energy. W = ΔKE = ½mv² – ½mu².
Q14. Energy possessed due to motion is called:
Kinetic energy is the energy possessed by an object due to its motion. An object in motion has kinetic energy.
Q15. An object moving faster can do:
An object moving faster has greater kinetic energy. Since energy is the capacity to do work, a faster moving object can do more work.
Q16. Winding a toy car stores energy in:
When a toy car is wound, energy is stored in the spring as elastic potential energy. When released, this energy converts to kinetic energy and the car moves.
Q17. Energy transferred while stretching a rubber band becomes:
When a rubber band is stretched, the energy transferred to it is stored as elastic potential energy. This energy can be released when the band returns to its original shape.
Q18. The difference between final and initial kinetic energy gives:
Work done = Change in kinetic energy = Final kinetic energy – Initial kinetic energy = ½mv² – ½mu².
Q19. Dropping a ball on sand causes a deeper dent when:
A ball dropped from a greater height has more kinetic energy upon impact, causing a deeper dent. More height means more potential energy converted to kinetic energy.
Q20. A rotating wheel can do work because it:
A rotating wheel has kinetic energy because it is in motion. This energy can be used to do work, such as driving machinery.
Q21. Flowing water possesses:
Flowing water has kinetic energy because it is in motion. This energy can be harnessed to produce hydroelectric power.
Q22. Kinetic energy of a body is equal to:
The kinetic energy of a body is equal to the work done to bring it from rest to its current speed. Work done = change in kinetic energy = ½mv² – 0.
Q23. The faster an object moves, the:
Kinetic energy = ½mv². Since kinetic energy is proportional to the square of velocity, faster moving objects have greater kinetic energy.
Q24. The formula for kinetic energy is:
The formula for kinetic energy is KE = ½mv², where m is mass and v is velocity. Kinetic energy is directly proportional to mass and the square of velocity.
Q25. Energy stored due to work done on an object is:
When work is done on an object, energy can be stored as potential energy. This includes gravitational potential energy (due to height) and elastic potential energy (due to deformation).
Q26. A moving object can do work because it:
A moving object can do work because it possesses kinetic energy. Energy is the capacity to do work.
Q27. Joule formulated the law of:
James Prescott Joule formulated the law of heating effect of electric current (Joule’s law), which states that heat produced in a resistor is proportional to I²Rt.
Q28. An object possesses energy if it can:
Energy is defined as the capacity to do work. If an object can do work, it possesses energy.
Q29. Which of the following possesses kinetic energy?
A flying aircraft is in motion, so it possesses kinetic energy. The other options are stationary and do not have kinetic energy.
Q30. Energy stored in the spring of a toy car is:
The spring of a toy car stores elastic potential energy when wound. This is potential energy because it is stored energy due to deformation.
Q31. Kinetic energy is defined as:
Kinetic energy is the energy possessed by an object due to its motion. It depends on mass and velocity.
Q32. A moving bullet can do work because it has:
A moving bullet has kinetic energy due to its motion. This energy allows it to do work, such as penetrating a target.
Q33. Joule is best known for his work in:
James Prescott Joule is best known for his contributions to electricity and thermodynamics. He established the relationship between mechanical work and heat.
Q34. Stretching a rubber band stores energy as:
When a rubber band is stretched, energy is stored as elastic potential energy. This stored energy can be released when the band returns to its original shape.
Q35. A compressed slinky stores:
A compressed slinky stores elastic potential energy. When released, this stored energy converts to kinetic energy and the slinky expands.
Q36. Potential energy is stored when energy is:
When work is done but does not change the speed of an object, the energy is stored as potential energy. For example, lifting an object stores energy as gravitational potential energy.
Q37. The energy of motion is absent when:
Kinetic energy is the energy of motion. When an object is at rest, it has no kinetic energy because its velocity is zero.
Q38. The kinetic energy equation is derived using:
The kinetic energy equation KE = ½mv² is derived using the laws of motion, specifically from the work-energy theorem and Newton’s Second Law.
Q39. Raising an object to a height gives it:
Raising an object to a height gives it gravitational potential energy = mgh. This energy is stored due to its position.
Q40. The SI unit of kinetic energy is:
The SI unit of kinetic energy is the joule (J), which is the same as the unit of work and energy. 1 J = 1 kg·m²/s².
Q41. Increasing the velocity of a car requires:
To increase velocity, work must be done on the car. The work done is positive because force and displacement are in the same direction.
Q42. Blowing wind has energy because it:
Blowing wind has kinetic energy because it is moving air. This energy can be harnessed by wind turbines to generate electricity.
Q43. The kinetic energy of an object depends on:
Kinetic energy depends on mass and velocity: KE = ½mv². It does not depend on colour, shape, height, or time.
Q44. Kinetic energy increases when:
Since KE = ½mv², increasing speed (velocity) increases kinetic energy significantly because velocity is squared.
Q45. When velocity of an object increases, its kinetic energy:
Kinetic energy is proportional to the square of velocity. So when velocity increases, kinetic energy increases.
Q46. A 15 kg object moving at 4 m/s has kinetic energy:
Using KE = ½mv² = ½ × 15 × (4)² = 0.5 × 15 × 16 = 120 J.
Q47. The work–energy relationship states that:
The work-energy theorem states that the net work done on an object equals the change in its kinetic energy. W = ΔKE = ½mv² – ½mu².
Q48. A stretched rubber band tends to regain its length because:
A stretched rubber band stores elastic potential energy. When released, this stored energy is converted to kinetic energy, causing the band to return to its original length.
Q49. Energy stored due to position or configuration is called:
Potential energy is the energy stored in an object due to its position (gravitational potential energy) or configuration (elastic potential energy).
Q50. James Prescott Joule lived during:
James Prescott Joule was born in 1818 and died in 1889. He was a British physicist who made significant contributions to the study of energy and thermodynamics.