# Shared Flashcard Set

## Details

Unit 17
Gravity
20
Physics
04/07/2013

Term
 Who discovered gravity?
Definition
 Issac Newton [image]
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 [image]
Supporting users have an ad free experience!