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Unit 17
Gravity
20
Physics
7th Grade
04/07/2013

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Cards

Term
Who discovered gravity?
Definition

Issac Newton

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Term
How did Newton discover gravity?
Definition
While studying why planets move the way they do, he eveloped the idea of gravity. Knowing that planets orbit in eliptical paths, so Newton realized they must be acted upon by an unbalenced force, gravity
Term
What is the Law of Universal Gravitation?
Definition
Every object in the universe pulls on every other object
Term
What does the strength of gravity depend on?
Definition
Mass & distance
Term
What is the equation to determine the force of gravity?
Definition

       M1M2

F = G -----------

        d2

Term
What is G?
Definition

Constant

6.67 x 10-11

Term
What is told to us by the value of G?
Definition
Gravitational force is really weak
Term
What is the equation for wieght?
Definition
W = mg
Term
Whta is g?
Definition

Acceleration of Gravity

9.8 m/s2

G ≠ g

Term
What is a projectile?
Definition
Any object that mmoves through air or space, acted on only by gravity ( possibly air friction)
Term
What is trajectory?
Definition
Path of projectile
Term
Describe the horizontal component of trajectory.
Definition
If no friction is present, moves at constant velocity
Term
Describe the vertical component of trajectory.
Definition
Accelerates downward due to gravity
Term
Which component of trajectory isnt affected by gravity?
Definition
Horizontal
Term
What happens at different launch angles?
Definition
The altitude and ranges differ.
Term
What happens when two launch angles add to 90°?
Definition
The objects fall in the same place
Term
What is free fall?
Definition

When an object is falling under the influence of only gravity

 

Term
What is the equation for the velocity of an object in free fall?
Definition
V=gt
Term

What is the equation for the distance of an object that has free fallen?

Definition

 1

d = --- gt2

 2

Term
Describe the trajectory of an projectile thrown up.
Definition

At top = o m/s

All other arrows have same velocity

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