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Chapter 5 Test
Newton's laws
13
Science
8th Grade
04/14/2012

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Term
 Force
Definition
 A push or pull
Term
Net Force
Definition
The sum of two or more forces on an object.
Term
Unbalanced Forces
Definition
 Result in a net force on an object that can cause changes in motion.
Term
Interia
Definition
 The property of an object that resists changes in it's motion
Term
Speed
Definition

The distance an object travels divided by the time it takes. 

s= d/t

 

 

Term
Velocity
Definition
A variable that tells both speed and direction
Term
What is the difference between Speed and Velocity?
Definition
Speed and Velocity are different because speed is a measurement of distance and time but velocity is a measurement of speed and direction.
Term
Newton (as in a measurement)
Definition
The metric unit of force, equal to the force needed to make a 1 kg a object accelerate at 1 m/s^2 
Term
Newton's First Law
Definition
An object at rest will stay at rest and an object in motion will stay in motion with the same velocity unless acted upon by an unbalanced force.
Term
Newton's Second Law
Definition

Acceleration is force/mass.

 

A=F/M

F=MA

M=F/A

Term
Newton's Third Law
Definition
For every action force, there is a reaction force equal in strength and opposite in direction.
Term
What is the relationship between mass and acceleration?
Definition

When mass goes up, acceleration goes down.

This is called being inversely proportional.

 

Term
In vacuum of outerspace
Definition
When a spacecraft (in outerspace) is out of range from the gravitational pull of Earth, a spacecraft can travel in a constant direction, at a constant speed because that pull of gravity is gone.
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