Everything About Gravity
Earth Spins on Its Axis, People on The Equator Hurtle Round at About 1,600 Kph (1,000 Mph), But They Don’t Fly Off into The Sky. Gravity Is the Force the Pins Us to The Planet, And It Also Keeps the Stars Spinning Endlessly in Space. Gravity Is the Pull of Every Object on Everything Else and It Holds the Universe Together Like A Giant, Invisible Spider’s Web.
Earth Gravitational Pull Is Lower the Further You Go from The Center of The
Planet So You Weigh Slightly Less at The Top of Mountain Than You Do Down A
Mine. But, No Matter How High Up You Go, Even If You Take A Rocket to The
Stars, There Is No Escape from Gravity Altogether Because It Extends to An
Infinite Distance. The Only Way to Right Gravity Is to Balance in With
Another Force Planes and Helicopters Fight Gravity by Using Lift to Shoot
into The Sky, Not Everyone Wants to Fight Gravity However Skydivers Embrace
Gravity by Jumping Out of Planes and Using the Force to Hurtle at Great
Speeds Towards the Ground.
Gravity Is A Force of Attraction – Always A Pull and Never A Push. This Is
Different from Magnetism and Other Forces, Which Can Either Pull (Attract)
Or Push (Repel). The Gravitational Pull Between Two Things Depends on Their
Mass and The Distance Between Them. The Bigger the Mass and Shorter the
Distance, The Greater the Pull.Force of Attraction
Falling Pear:
Gravity Makes A Pear and Earth Pull Each Other With the Same Force. The Pear Falls to The Ground Because Earth Has A Greater Mass, And So Accelerates Far Less Than the Pear.
- Force of Gravity Makes Pear Fall
- Earth Pulls Pear A Long Distance Down to Ground
- Earth and Pear Pull Together with Exactly the Same Force
- Pear Pulls Earth A Tiny Distance Up to Meet It.
Mass and Weight
The Words Mass and Weight Are Often Used to Mean the Same Thing, But They Are Different. Mass Is the Amount of Matter and Object Has and Weight Is the Force Pulling on Matter Because Of Gravity. Your Mass Is Always the Same, But Your Weight Varies from Place to Place Because of Gravity Varies Across Earth.Earth Vs Moon
People Weight About A Sixth as Much on The Moon as They Do on Earth. Astronauts Can Leap Further on The Moon Because the Gravitational Force Is Much Weaker There Than on Earth.
Earth - Man Of 75kg (165Ib) Mass, Weigh 75kg (165Ib) On Earth
Moon – Man Of 75kg (165Ib) Mass, Weigh 12.5kg (27.5Ib) On Moon
Pull of The Tides
The Moon Is Smaller and Lighter Than Earth, And About 384,000 Km (240,000 Miles0 Away. Even So, It Is Big Enough to Pull on The Earth’s Oceans as It Spins Around Our Planet. And This Is What Causes Tides. The Sun, Which Is Further Away, Also Affects the Tides. Twice A Month, When the Sun and Moon Line Up, We Get Higher and Lower Tides Than Usual Because Of Their Combined Pull.
Neap Tide
When the Sun and Moon Are at Right Angles, They Pull-in Different
Directions, Cancelling Each Other’s Effects, So Both the High and Low
Tides Are Smaller Than Usual.
Spring Tide
When the Sun and Moon Line Up, Their Gravitational Pulls Add Together. This Makes High Tides Higher, And Low Tides Lower, Than Usual.
