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Science
N/A
30
Science
9th Grade
03/06/2011

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Cards

Term
Force
Definition
A push or a pull. Always acts in the same direction
Term
Balanced Force
Definition
Forces that are equal in size, and in opposite direction, also do not cause a change in motion on an object
Term
Unbalanced Force
Definition
Causes a change in motion of an object
Term
Give two ways that unbalanced forces can change the motion of an object
Definition
  1. Acts on an object at rest therefore it causes the object to move
  2. Acts on an object in motion therefore the motion of the object will change
Term
Net Force
Definition
The combination of all forces acting on an object
Term
What are some forces in nature?
Definition
  • Wind
  • Gravity
  • Air
  • Tides
  • Waves
Term
Newton's Law of Gravity
Definition
  • Gravity is a force of attraction between all objects in the universe
  • On earth all objects "fall" or are pulled toward the center of the earth's mass
Term
Distance Formula
Definition
1/D2
Term
Friction
Definition
A force that opposes motion between two surfaces
Term
Why does friction occur?
Definition
Friction occurs because the surface of an object is "rough"
Term
What are the two types of friction?
Definition
  1. Static Friction
  2. Kinetic Friction
Term
Static Friction
Definition
The friction between stationary surfaces
Term
Kinetic Friction
Definition
The force that opposes the movement of two surfaces that are in contact and sliding over each other
Term
Static Friction and Kinetic friction- Which is greater?
Definition
Static Friction
Term
Terminal Velocity
Definition
The force applied to the object equals the force of fluid friction. Terminal velocity is a balanced force
Term
Streamlining
Definition
Change shape of object to reduce fluid fricton
Term
What are ways to overcome friction?
Definition
  • Streamlining
  • Lubricants (gas, liquid, solid) oil, water, silver, butter, ice
Term
Motion
Definition
An object change in position (w.r.t) with respect to a stationary reference point
Term
Reference Point
Definition
Stationary object
Term
Reference Direction
Definition

N, E, S, W (up and down)

Toward a reference object

Term
Actual Distance
Definition
The actual route you travel (all twists, turns) Indirect route
Term
Displacement Distance
Definition
Straight line distance
Term
Speed
Definition

How fast an object moves over a over distance and time

S = D/T

Term
Constant Speed
Definition
An object covers equal distances in equal amounts of time
Term
Example of constant speed
Definition
Cruise control, terminal velocity
Term
Average Speed
Definition
The distance traveled by an object divided by the time the object takes to travel that distance
Term
Instantaneous Speed
Definition
Distance traveled over a very short interval
Term
Velocity
Definition
Both speed and direction
Term
Acceleration
Definition

The rate at which velocity changes over time

A = D/T2

Term
How is acceleration calculated?
Definition

Acceleration = Final Veocity-Initial Velocity/Time

A = Vf-Vi/T

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