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Unit 8-Forces/Motion and Work/Machines
vocab cards
14
Science
6th Grade
02/26/2013

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Cards

Term

 

 

1. air resistance

Definition
A force that opposes the motion of objects that are falling through the air. (air friction)
Term

 

 

vacuum

Definition
A space where there is no matter.  Outer space is an example of this.
Term

 

 

inertia

Definition
the tendency of an object to stay at rest or in motion (objects just want to keep on doing whatever it is doing)
Term

 

 

Newton's 1st Law of Motion

Definition
an object at rest will remain at rest, an object in motion will remain in motion UNLESS acted on by an UNBALANCED force.
Term

 

 

Newton's 2nd Law of Motion

Definition

The acceleration of an object depends on the mass of the object and the amount of force applied.

F = m x a

Term

 

 

formula for force

Definition

F= ma

(Force= mass x acceleration)

Term

 

 

Newton's 3rd Law of Motion

Definition

For every action there is an equal and opposite reaction. Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. Forces always work in pairs.

Example-a rocket shipping blasting off.  The gases push down and the rocket pushes up.

Term

 

 

force pairs

Definition

All forces act in pairs. When a force is exerted, there is always a reaction force.

Example-Hitting a baseball bat, the bat exerts a force on the ball and sends the ball flying.

Term

 

 

momentum

Definition

A property of all moving objects. Momentum is determined by two factors:  mass and velocity

Momentum = mass x velocity

Term

 

 

Law of Conservation of Momentum

Definition
Momentum can be transferred but cannot be lost within a system. When one moving object collides with another moving object, the motion of both objects changes. 
Term

 

 

work

Definition
 The transfer of energy to an object using a force that causes the object to move in the direction of the force.
Term

 

 

Formula for Work

Definition
W= F x d
Term

 

 

joule (J)

Definition
The unit/label for work
Term

 

 

machine

Definition
A device that helps do work by either overcoming a force or changing the direction of the applied force.
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