Visual Check4. Recognize Whatenergy transformationsoccur as the drums are lifted? WorkUpward forceUpward forceDrums' weightDrums' weightThe drummer does work on the drums ashe lifts them. The drums’kinetic energy andgravitational potential energy increase.The drummer is no longer doing work onthe drums because the drums are notmoving in the direction of the applied force.Recall that forces are pushes or pulls. When you lift anobject, you transfer energy from your body to the object. Asthe boy lifts the drums in the figure above, the drums moveand have kinetic energy. As the drums move higher aboveEarth's surface, they gain gravitational potential energy. Theboy has done work on the drums.Visual Check4. Recognize Whatenergy transformationsoccur as the drums are lifted?On the right in the figure above, the boy is standing stillwith his drums lifted in place. Because he is not moving thedrums, he is not doing work. To do work on an object, anobject must move in the direction of the force. Work is doneonly while the force is moving the object.Key Concept Check5. Descrihe If vou do workCopyright © Glencoe/McGraw-Hill,

Gravitational potential energy is the energy an object has by virtue of its position above the…

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4. Recognize What energy transformations occur as the drums are lifted?

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Visual Check
4. Recognize What
energy transformations
occur as the drums are lifted?

Work
Upward force
Upward force
Drums' weight
Drums' weight
The drummer does work on the drums as
he lifts them. The drums’kinetic energy and
gravitational potential energy increase.
The drummer is no longer doing work on
the drums because the drums are not
moving in the direction of the applied force.
Recall that forces are pushes or pulls. When you lift an
object, you transfer energy from your body to the object. As
the boy lifts the drums in the figure above, the drums move
and have kinetic energy. As the drums move higher above
Earth's surface, they gain gravitational potential energy. The
boy has done work on the drums.
Visual Check
4. Recognize What
energy transformations
occur as the drums are lifted?
On the right in the figure above, the boy is standing still
with his drums lifted in place. Because he is not moving the
drums, he is not doing work. To do work on an object, an
object must move in the direction of the force. Work is done
only while the force is moving the object.
Key Concept Check
5. Descrihe If vou do work
Copyright © Glencoe/McGraw-Hill,

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