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Chapter 4 Acceleration and p
9th grade IS acceleration and momentum
18
Science
9th Grade
09/04/2012

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Term
Newton's 2nd Law of Motion
Definition
A net force acting on an object causes the objedt to accelerate in the direction of the force.
F = ma
Term
Newton's 1st Law of Motion
(The Law of Inertia)
Definition
If an object is moving it will continue to move at a constant velocity unless a net force acts on it.
An object at rest will remain at rest unless a net force acts on it.
Term
Newton's 3rd Law of Motion
Definition
Action-Reaction pairs; for every action force, there is an equal and opposite reaction force.
Term
AIR RESISTANCE (Fluid Friction)
Definition
Frictional force air exerts on a moving object; acts opposite in the direction to the objects motion.
Term
TERMINAL VELOCITY
Definition
The greatest velocity reached by a falling object. Achieved when the force of gravity is balanced by air resistance.
Term
PROJECTILE
Definition
Any object shot or thrown through the air, all projectiles have both horizontal and vertical velocities.
Term
CETRIPETAL ACCELERATION
Definition
Acceleration toward the center of a circle by an object moving along a circular path.
Term
CENTRIPETAL FORCE
Definition
The force that causes an object moving along a circular path to move towards the center of the path.
Term
ARTIFICIAL SATELLITE
Definition
Man-made device that orbits Earth;used for communications, weather-monitoring....
Term
MOMENTUM
Definition
A property of any moving object; the momentum (p) of an object is the product of its mass (m) and velocity (v). p = mv
Term
LAW OF CONSERVATION OF MOMENTUM
Definition
A law stating that the total momentum (p) of a group of objects is conserved unless a net force act on the objects.
Term
MASS
Definition
A measurement of the amount of matter in an object; SI unit - kg
Term
DENSITY
Definition
The mass per nitvolume of a material (g/cm^3)or (g/ml) describe how tightly packed a substanc's molecules are.
Term
GRAVITY
Definition
Force exerted by every object in the univers on every other object. The amount of gravitational force depends on the masses of the objects and the distance between them.
Term
Lift
Definition
This is achieved when the upward push from air is greater than the downward push on the wing of a plane.
Term
Thrust
Definition
The force that pushes a projectile (plane) forward. The opposite of drag.
Term
Gravity
Definition
This force pulls an object to Earth at the rate of 9.8 m/s^2.
Term
Acceleration
Definition
acceleration = force / mass
m/s^2 = Newtons / grams
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