# Shared Flashcard Set

## Details

Forces and Motion
Newton's Laws, Forces and Motion
49
Science
02/23/2015

Term
 Velocity
Definition
 The distance an object travels per unit of time and the direction in which it moves.
Term
 acceleration
Definition
 The rate of change of velocity
Term
 Force
Definition
 A push or a pull
Term
 Newton
Definition
 SI unit of force
Term
 Balanced force
Definition
 Forces on an object that are equal in size and opposite in direction.
Term
 net force
Definition
 The sum of two or more forces-  the overall force.
Term
 Inertia
Definition
 The tendency of an object to resist change in its motion.
Term
 Newton's First Law
Definition
 An object moving at a constant velocity keeps moving at that velocity unless acted upon by an unbalanced force.
Term
 Real-life example of Newton's First Law
Definition
 The use of seat belts to reduce injury.
Term
 Changes of speed or direction result in this.
Definition
 acceleration
Term
 reference point
Definition
 Used to determine an object's position
Term
 Walking with a constant speed away from the sensor.
Definition
 Line that is linear and positive on a position-time graph.
Term
 Horizontal line on a position-time graph
Definition
 No movement (no change in position).
Term
 Newton's Second Law
Definition
 The acceleration of an object is in the same direction as the net force on the object.
Term
 F=ma
Definition
 Newton's Second Law
Term
 Friction
Definition
 The force that opposes the sliding motion of two surfaces that are touching each other.
Term
 microwelds
Definition
 The dips and bumps on the surface of objects smooth or rough which cause friction.
Term
 Static Friction
Definition
 The force which must be overcome before an object can move.
Term
 Sliding friction
Definition
 Results when two surfaces are moving past each other.  Also called kinetic.
Term
 Air Resistance
Definition
 A friction-like force which opposes falling objects.
Term
 Depends on speed, size and shape of an object
Definition
 Air resistance
Term
 Terminal velocity
Definition
 The force of air resistance is equal to the force of gravity of a falling object.
Term
 Gravity
Definition
 The attractive force between any two objects
Term
 Depends on the distance apart and mass of two objects
Definition
 Gravity
Term
 Weight
Definition
 The gravitational force exerted on an object
Term
 Newton's Third Law of Motion
Definition
 For every action, there is an equal but opposite reaction
Term
 An example of Newton's Third Law
Definition
 Letting go of a balloon
Term
 An example of Newton's Second Law
Definition
 It takes 50N of force to accelerate a 1000Kg car to .05m/s2
Term
 Motion
Definition
 A change in an object's position determined by using reference point
Term
 Velocity
Definition
 The speed and direction of an object
Term
 Newton's First Law of Motion
Definition
 An object not being subjected by a force will continue to move at a constant speed in a straight line or stay at rest.
Term
 Balanced Force
Definition
 Having a net force of zero
Term
 Gravitational Force
Definition
 Everything on or around the Earth is pulled towards Earth's center.
Term
 The cause of an acceleration
Definition
 Unbalanced force
Term
 speed
Definition
 Distance per unit of time
Term
 Displacement
Definition
 The location of an object as measured from its starting point.
Term
 Distance
Definition
 A measurement of how far an object has moved.
Term
 Describes an object which is moving without accelerating. Forces are balanced.
Definition
 Constant Velocity
Term
 Net Force
Definition
 The sum of all forces acting on an object.
Term
 Inertia
Definition
 The property of an object to resist change in its motion.
Term
 Force
Definition
 A push or a pull. Measured in Newtons.
Term
 Acceleration
Definition
 The rate at which velocity changes with time.
Term
 Friction
Definition
 A resistive force which opposes motion.
Term
 Mass
Definition
 The amount of matter in an object. Measured in grams or Kilograms.
Term
 Weight
Definition
 The force upon an object due to gravity (mass X gravity). Measured in Newtons
Term
 F=m x a
Definition
 Newton's Second Law.
Term
 Newton's Second Law
Definition
 The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the object's mass.
Term
 Newton's Third Law of Motion
Definition
 Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Term
 Terminal Velocity
Definition
 The speed at which a falling object has no net force because the gravitational force pulling down is equal to but opposite the force of air resistance pushing up on the object.
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