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Published byNoah Austin Modified over 8 years ago

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Mechanical Work: More Practice

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Gravitational Potential Energy: More Practice

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Kinetic Energy: Learning Goals The student will be able to describe the kinetic energy of an object (the energy of motion) in qualitative and quantitative terms.

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Kinetic Energy SPH4C

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F = ma When a force is applied to accelerate an object from speed v 1 to speed v 2, the work done on the object can be written as:

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... add in some kinematics: Since and,

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... add in some kinematics: Since and,

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... add in some kinematics: Since and,

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Kinetic Energy Since this work is done to increase the speed of the object, the energy that is increased is the object's kinetic energy E k :

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Kinetic Energy Since this work is done to increase the speed of the object, the energy that is increased is the object's kinetic energy E k : Kinetic energy is therefore:

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Example 1 A car of mass 1500 kg is travelling at a speed of 24 m/s. Calculate the kinetic energy of the car.

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Example 1 A car of mass 1500 kg is travelling at a speed of 24 m/s. Calculate the kinetic energy of the car.

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Example 2 An object of mass 5.0 kg is travelling at a speed of 4.0 m/s. 27 J of work is done to increase the speed of the object. Calculate its final kinetic energy and final speed.

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Example 2 An object of mass 5.0 kg is travelling at a speed of 4.0 m/s. 27 J of work is done to increase the speed of the object. Calculate its final kinetic energy and final speed.

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Example 2 An object of mass 5.0 kg is travelling at a speed of 4.0 m/s. 27 J of work is done to increase the speed of the object. Calculate its final kinetic energy and final speed.

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Example 2 An object of mass 5.0 kg is travelling at a speed of 4.0 m/s. 27 J of work is done to increase the speed of the object. Calculate its final kinetic energy and final speed.

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More Practice Going the (Horizontal) Distance Lab Activity

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