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Physics Semester Review ch 4
Semester Review
30
Physics
10/17/2011

Term
 contact force
Definition
 A force that arises from the physical contact of 2 objects.
Term
 Force
Definition
 The cause of an acceleration or a change in velocity.
Term
 force diagram
Definition
 A diagram of the objects involved in a situation and the forces exerted on the objects.
Term
 Inertia
Definition
 The tendency of an object to maintain its current state of motion.
Term
 Air Resistance
Definition
 Friction caused by air or water.
Term
 Newton's First Law
Definition
 An object at rest remains at rest, and an object in motion remains in motion, unless effected by a force.
Term
 external force
Definition
 A single force that acts on an object as a result of the interaction between the object and its environment.
Term
 A force is a...
Definition
 vector
Term
 Kinetic Friction
Definition
 The resistive force that opposes the relative motion of 2 contacting surfaces that are moving past one another.
Term
Definition
 Caused by electrostatic forces between molecules of 2 surfaces.
Term
 action-reaction pair
Definition
 A pair of simultaneous equal but opposite forces resulting from the interaction of 2 objects.
Term
 Is it easier to start the movement of an object or keep it moving?
Definition
 keep it moving
Term
 When the net external force on an object is zero...
Definition
 its acceleration is zero
Term
 coefficient of friction
Definition
 The ratio of the force of friction the normal force.
Term
 Unit for force- Newton
Definition
 1kg x 1m/s2
Term
 Newton's Second Law
Definition
 The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the object's mass.
Term
 Field Force
Definition
 A force that can exist between objects, even in the absence of physical contact.
Term
 Net External Force
Definition
 The total force resulting from a combination of external forces on an object; also called resultant force.
Term
 Equilibrium
Definition
 The state in which there is no change in a body's motion.
Term
 Newton's Third Law
Definition
 For every action there is an opposite and equal reaction.
Term
 Weight
Definition
 The magnitude of the force of gravity acting on an object.
Term
 Normal Force
Definition
 A force exerted by one object on another in a direction perpendicular to the surface of contact.
Term
 Weight is a
Definition
 scalar quantity
Term
 The equation for weight
Definition
 W=mg
Term
 Static Friction
Definition
 The resistive force that opposes the relative motion of two contacting surfaces that are at rest with respect to one another.
Term
 The force of friction is proportional to the...
Definition
 normal force
Term
 Mass
Definition
 Physical quantity to measure inertia.
Term
 Forces always exist in...
Definition
 pairs (third law)
Term
 Friction
Definition
 A resistive force that acts in a direction opposite to the relative motion.
Term
 equilibrium
Definition
 the state in which there is no change in a body's motion
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