Transcript Gravity - MsAskins

TEKS 6.11B: Understand that gravity is the force that governs the motion of our solar system.
What is gravity?
• Gravity is a force that attracts all objects toward each other.
• The law of universal gravitation states: Every object in the
universe attracts every other object.
• The strength of the force of gravity between two objects
depends on two factors:
• The mass of the objects
• The distance between the objects
(contd.)
TEKS 6.11B: Understand that gravity is the force that governs the motion of our solar system.
1. Predict Would a spaceship experience a stronger force of
gravity close to Earth or close to the moon? Why?
TEKS 6.11B: Understand that gravity is the force that governs the motion of our solar system.
What keeps objects in orbit in the
solar system?
• Inertia is the tendency of an object to resist a change in motion.
• The greater an object’s mass, the greater its inertia.
• Newton’s first law of motion says 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 an
unbalanced force.
• Inertia and gravity combine to keep objects in orbit. Gravity pulls
planets toward the sun and keeps them from moving off in a
straight line. Inertia keeps objects moving forward so they do not
fall toward the sun.
(contd.)
TEKS 6.11B: Understand that gravity is the force that governs the motion of our solar system.
The diagram shows how gravity and inertia combine to keep objects
in orbit.
2. Summarize In your own words, explain why planets orbit the sun.