Chap. 4 Vocabulary

Term Definition
force a push or a pull on an object
noncontact force a force that pushes or pulls an object without touching it.
contact force a push or a pull applied by one object to another object that is touching it.


a contact force that resists the sliding motion between two objects that are touching.

gravity a non-contact attractive force that exists between all objects that have mass.
balanced force the forces acting on an object, when the net force of an object is 0 N.
unbalanced force the forces acting on an object, when the net force of an object is not 0 N
energy the ability to cause change
kinetic energy the energy an object has when it is in motion
potential energy stored energy that depends on the interaction of objects, particles or atoms.
electric energy the energy that an electric current carries is a form of kinetic energy.
chemical energy the energy that is stored in and released from the bonds between atoms.
nuclear energy energy stored in and released from the nucleus of an atom.
mechanical energy the sum of the potential energy and the kinetic energy in a system of objects.
thermal energy the sum of the kinetic energy and the potential energy of the particles that make up an object.
sound energy energy carried by sound waves.
seismic energy energy transferred by waves moving through the ground.
radiant energy energy carried by electromagnetic waves
energy transformation the conversion of one form of energy to another.
law of conservation of energy says that energy can be transformed from one form to another, but it cannot be created or destroyed
work the transfer of energy that occurs when a force makes an object move in the direction of the force while the force acts on the object.
joule how work is measured
Formula for Work W=Fd
Work(joules)=Force(newtons) times distance

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