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Mechanical Work

Mechanical Work. A student uses a force of 20 N to push a book 1.0 m along a table. A frictional force of 20 N opposes the motion of the book. The work done by the student is: 0 J B. 20 J C. 40 J D. ICBD

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Mechanical Work

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  1. Mechanical Work A student uses a force of 20 N to push a book 1.0 m along a table. A frictional force of 20 N opposes the motion of the book. The work done by the student is: • 0 J B. 20 J C. 40 J D. ICBD If a force is applied to an object that is opposite its direction of motion, the total mechanical energy of the object will be: A. the same B. increased C. decreased D. ICBD

  2. Mechanical Work A student uses a force of 20 N to push a book 1.0 m along a table. A frictional force of 20 N opposes the motion of the book. The work done by the student is: • 0 J B. 20 J C. 40 J D. ICBD If a force is applied to an object that is opposite its direction of motion, the total mechanical energy of the object will be: A. the same B. increased C. decreased D. ICBD

  3. Mechanical Work A student uses a force of 20 N to push a book 1.0 m along a table. A frictional force of 20 N opposes the motion of the book. The work done by the student is: • 0 J B. 20 J C. 40 J D. ICBD If a force is applied to an object that is opposite its direction of motion, the total mechanical energy of the object will be: A. the same B. increased C. decreased D. ICBD

  4. Gravitational Potential Energy 3U Physics

  5. Gravitational Potential Energy:Learning Goal The student will be able to explain the concept of gravitational potential energy and conduct an inquiry to explore the work and power output when an object is lifted. (D3.3, D2.6)

  6. Working Against Gravity If you lift an object a distance Dh at a constant velocity, the vertical forces must be

  7. Working Against Gravity If you lift an object a distance Dh at a constant velocity, the vertical forces must be balanced and the applied force that does the work must be equal in magnitude but opposite in direction to the

  8. Working Against Gravity If you lift an object a distance Dh at a constant velocity, the vertical forces must be balanced and the applied force that does the work must be equal in magnitude but opposite in direction to the force of gravity.

  9. Gravitational Potential Energy The energy that this work is increasing is the object’s gravitational potential energy.

  10. Gravitational Potential Energy Although gravitational potential energy is often written as: where h is understood as being relative to some reference point.

  11. Gravitational Potential Energy Note that there is no designated spot on Earth that is your reference point with zero height. You must designate the reference point.

  12. Eg Example An object of mass 3.0 kg is lifted at constant velocity from a height of 1.0 m to a height of 2.5 m. Find the increase in gravitational potential energy of the object.

  13. Eg Example An object of mass 3.0 kg is lifted at constant velocity from a height of 1.0 m to a height of 2.5 m. Find the increase in gravitational potential energy of the object.

  14. Eg Example An object of mass 3.0 kg is lifted at constant velocity from a height of 1.0 m to a height of 2.5 m. Find the increase in gravitational potential energy of the object.

  15. More Practice Upstairs Inquiry Activity & Homework: Gravitational Potential Energy

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