Gravity
This document was uploaded by user and they confirmed that they have the permission to share it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Report DMCA
Overview
Download & View Gravity as PDF for free.
More details
- Words: 357
- Pages: 11
Gravity
The Law of Gravitation Anything that has mass is attracted by the force of Gravity. The attractive force between 2 objects depends on two things: 1 – Mass of the objects 2 – Distance between them
As mass increases, gravitational force between the objects increases. As two objects move closer to each other, gravitational force increases between them.
The Range of Gravity
Gravity is a long-range force. Ex. The stars in our galaxy exert gravitational force on each other; helps keep its shape.
Gravitational Acceleration Remember Newton’s Second Law? F = ma • Acceleration due to gravity on earth is always 9.8 m/s2
•
Gravity Fw = m x 9.8 m/s2
Inertia and Gravity
Force depends on an object’s mass. Ex. Bowling ball vs. Tennis ball; the bowling ball has more gravitational force. ** However, the greater the mass, the more inertia an object has ** Tennis ball has less inertia, therefore it will fall at the same rate of the bowling ball.
Weight
Gravitational force exerted on an object is called weight. Weight = mass x acceleration due to gravity (W = m x 9.8 m/s2)
Ex. How much does a person with a mass of 50 kg weigh on earth? Answer 490 N Weight and mass are not the same. Weight
is a force Mass is the amount of matter an object has
A person weighing about 480N on earth would weigh about 80N on the moon. Does this person’s mass change? Answer No! The moon just has less gravitational force.
Weightlessness
If you stood on a scale in an elevator, and the elevator fell, you and the scale would be in free fall. The scale would not exert an upward force on you; it would fall with you. Your weight is 0 in free fall.
Projectile Motion
Anything that is thrown or shot through the air is called a projectile. Projectiles follow a curved path. Why? Answer They have horizontal and vertical velocities.
The Law of Gravitation Anything that has mass is attracted by the force of Gravity. The attractive force between 2 objects depends on two things: 1 – Mass of the objects 2 – Distance between them
As mass increases, gravitational force between the objects increases. As two objects move closer to each other, gravitational force increases between them.
The Range of Gravity
Gravity is a long-range force. Ex. The stars in our galaxy exert gravitational force on each other; helps keep its shape.
Gravitational Acceleration Remember Newton’s Second Law? F = ma • Acceleration due to gravity on earth is always 9.8 m/s2
•
Gravity Fw = m x 9.8 m/s2
Inertia and Gravity
Force depends on an object’s mass. Ex. Bowling ball vs. Tennis ball; the bowling ball has more gravitational force. ** However, the greater the mass, the more inertia an object has ** Tennis ball has less inertia, therefore it will fall at the same rate of the bowling ball.
Weight
Gravitational force exerted on an object is called weight. Weight = mass x acceleration due to gravity (W = m x 9.8 m/s2)
Ex. How much does a person with a mass of 50 kg weigh on earth? Answer 490 N Weight and mass are not the same. Weight
is a force Mass is the amount of matter an object has
A person weighing about 480N on earth would weigh about 80N on the moon. Does this person’s mass change? Answer No! The moon just has less gravitational force.
Weightlessness
If you stood on a scale in an elevator, and the elevator fell, you and the scale would be in free fall. The scale would not exert an upward force on you; it would fall with you. Your weight is 0 in free fall.
Projectile Motion
Anything that is thrown or shot through the air is called a projectile. Projectiles follow a curved path. Why? Answer They have horizontal and vertical velocities.
