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Forces motion and energy
chapter 2
14
Science
6th Grade
05/16/2011

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Term
Acceleration
Definition
the change in the velocity of an object that depends on the force & mass of the object
Term
Air Resistance
Definition
the force that slows down the motion of an object flowing through air
Term
Terminal velocity
Definition
the same speed and direction of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity.
The fastest an object can fall to the ground through the air
Term
orbiting objects
Definition
an object is in motion when it travels around another object in a circle
Term
Centripetal force
Definition
an unbalenced FORCE that allows objects to move in a circular path.
Gravity pulls the planets around (orbits) the sun.
Term
Projectile motion

(Hint--don't forget the two parts)

Definition
the curved path that an object follows when thrown,launched,or near the surface (horizontal motion) (vertical motion)

An object is thrown in a horizontal motion but gravity pulls it down in a vertical motion.
Term
Gravity
Definition
a force of attraction between objects that is due to their masses
Term
Momentum
Definition
a quantity defined as the product of the mass and velocity of an object
Term
Inertia
Definition
The likelihood of an object to keep moving or stay still until it is acted upon by an outside force.

the object doesn't want to move or if the object is moving it doesn't want to change speed or direction unless something acts on it
Term
Newtons 1st law of motion
Definition
An object at rest remains at rest and an object in motion remains in motion at the same speed and in a straight line unless acted on by an unbalanced force. Also known as Inertia
Term
Newtons 3rd 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
The law of conservation of momentum
Definition
when a moving object hits another object some or all of the momentum of the first object is transferred (moved) to the object that is hit
Term
Free Fall
Definition
the motion of a body when only the force of gravity is acting on the body
Term
Newton's 2nd law of motion
Definition
the accleration of an object
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