2 Earth In Space review 2 major motions of the earth are? Which motion causes day and night?What causes the seasons?What tilt is the earth at?What are solstices and equinoxes?How do solstices and equinoxes relate to seasons?How would seasons be different if Earth were not tilted?
3 Why Doesn’t the Moon fly off into Space? There must be a force acting between the two objectsA force is something that influences changeIsaac Newton identified that there must be a force acting between earth and moonForce that keeps moon in orbit different than forces we are influenced by everyday. Why?
4 GravityGravity is a force that attracts all objects towards each otherNewton did not discover gravity, only realized it as a universal forceGravity is measured in newtonsLaw of Universal Gravitation (Newton) states that every object in the universe attracts every other objectThe strength of the force of gravity depends on two things: Mass and Distance
6 Gravity, Mass and Distance Mass amount of matter in an objectMass never changesWeight is the force of gravity on an objectChanges with gravityMy mass is kg, my weight is 200 poundsMoon’s gravity is 1/6 of earth: what is my mass and weight?Mass Increases force of Gravity IncreasesDistance increases force of Gravity Decreases
7 Why doesn’t Earth crash into the Sun? Must be another force actingInertia ability of an object to resist change in motionNewton’s First Law of Motion states that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted upon by a force.
8 Why do Earth and Moon remain in their Orbits? 2 factors:Inertia and gravityGravity pulls objects towards each other, preventing the moon from going in a straight lineInertia makes the moon move forwardThe combination creates the orbit
10 Gravity and Motion Review What is the law of universal gravitation?What two factors determine the force of gravity between two objectsIf the moon was closer to Earth, how would the force of gravity between the Earth and moon be different?What two factors act together to keep Earth in the orbit around the sun?Why doesn’t Earth simply fall into the sun?How would Earth move if the sun suddenly disappeared? Explain your answer.