# Shared Flashcard Set

## Details

Test 3 - notes
no content on review sheet
44
Physics
09/10/2015

Term
 What is the push or pull that causes a change in motion?
Definition
 force
Term
 What is the object a force is acting upon?
Definition
 system
Term
 What causes an acceleration which is a change in velocity?
Definition
 net force
Term
 What causes an acceleration which is a change in velocity?
Definition
 net force
Term
 Why does an object in motion change direction, speed up, slow down, or stop?
Definition
 a force is acting on it
Term
 What can a change in speed and/or direction of an object cause?
Definition
 a change in velocity
Term
 Can an object have velocity without a force acting on it?
Definition
 yes
Term
 What exists when an object from the external world touches a system and thereby exerts a force on it?
Definition
 contact force
Term
 What kind of forces are exerted without contact?
Definition
 field forces
Term
 What do forces result from?
Definition
 interactions
Term
 What is the identifiable cause of the force (what is exerting the force)?
Definition
 agent
Term
 Can gravity act horizontally?
Definition
 no
Term
 What is force measured in?
Definition
 Newtons
Term
 What is a Newton?
Definition
 1 kg x m/s^2
Term
 What is the vector sum of all the forces in an object?
Definition
 net force
Term
 What is acceleration of an object that is proportional to the net force acting on it and inversely proportional to the mass of the object being accelerated?
Definition
 Newton's 2nd Law
Term
 What is the equation for Newton's 2nd Law?
Definition
 F=ma or a=Fnet/m
Term
 What will a stationary object with no net force acting on it do?
Definition
 stay at its position
Term
 In the ideal case of zero resistance, what should happen to horizontal motion?
Definition
 it should never stop
Term
 What is an object that is at rest will remain at rest and an object that is in motion will continue to move in a straight line with constant speed?
Definition
 Newton's 1st Law
Term
 What are the five types of force?
Definition
 friction, normal force, tension, thrust force, and weight
Term
 What kind of force is a contact force that acts to oppose sliding motion between surfaces (a "retarding force- acts parallel to the surface and opposite direction of sliding)?
Definition
 friction
Term
 What kind of force is a contact force exerted by a surface on an object- acts perpendicular to and away from the surface?
Definition
 normal force
Term
 What kind of force is a pull exereted by a string, rope, or cable when attached to a body and pulled taut, acts away from the object and parallel to the string, rope, or cable at the point of attachment?
Definition
 tension
Term
 What kind of force is one that moves objects like rockets, planes, cars, and people, acts in the same direction as the acceleration of the object, barring any resistive forces?
Definition
 thrust
Term
 What kind of force is a field force due to gravitational attraction between two objects, generally the Earth and an object, acts straight down toward the center of Earth?
Definition
 weight
Term
 What is another name for Newton's First Law?
Definition
 the law of inertia
Term
 What is the tendency of an object to resist change?
Definition
 inertia
Term
 Since velocity includes both speed and direction of motion, what is required to change either the speed or direction?
Definition
 a net force
Term
 What is the net force on an object when it's zero?
Definition
 equilibrium
Term
 What kind of force do scales exert when someone stands on them?
Definition
 upward
Term
 What is the force an object experiences as a result of all the forces acting on it, giving the object an acceleration?
Definition
 apparent weight
Term
 no contact forces are pushing up on the object and the object's apparent weight is zero (not zero actual weight)
Definition
 weightlessness
Term
 What is force exerted by a fluid on the object moving through the fluid (note- air is a type of fluid)?
Definition
 drag force
Term
 What causes the magnitude of the drag force to increase?
Definition
 the speed of the air increases
Term
 What is the constant velocity reached when the drag force equals the force of gravity?
Definition
 terminal velocity
Term
 no net force results in what?
Definition
 no acceleration
Term
 What are greatly affected by a drag force and quickly reach terminal velocity?
Definition
 light objects with large surface area
Term
 What are two forces that are in opposite directions and have equal magnitude (action- reaction pair of forces- exist together or not at all)?
Definition
 interaction pair
Term
 All forces come in pairs. The force on one object is equal in magnitude and opposite in direction the other.
Definition
 Newton's 3rd Law
Term
 What occurs on a moving object, force exerted on one surface by another when the two surfaces rub against each other because on e or both are moving?
Definition
 kinetic friction
Term
 What kind of friction is a force exerted on one surface by another when there is no motion between the two surfaces?
Definition
 static friction
Term
 What relates frictional to normal force?
Definition
 coefficient of kinetic friction
Term
 What is the maximum static friction that must be overcome before motion begins?
Definition
 coefficient of static friction
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