Tides, gravity and motion Flashcards
(21 cards)
If mass increases…
The amount of force of gravity increases.
What is gravity?
The force that attracts all objects towards each other.
If mass decreases…
The amount of the force of gravity decreases.
If distance increases…
The amount of the force of gravity decreases.
If the distance decreases…
The amount of the force of gravity increases.
What is Newton’s law of universal gravitation?
Every object in the universe attracts another object.
Newtons
The unit measured for measuring gravity
Mass
The amount of matter in an object.
Weight
The force of gravity on an object.
Inertia
The tendency of an object to resist a change in motion.
Newtons First Law
An object at rest tends to stay at rest/ an object in motion tends to stay in motion.
What two things combined keep objects in motion?
Inertia and gravity
Tides
The rise and fall of water about every 12.5 hours.
Why do tides occur?
Tides occur because of gravity pulling the moon and earth toward each other. Depending on the position of the moon tide ranges vary.
Spring tide
A tide with the greatest distance between a high and low tide. They occur during new and full moons, when the sun earth and moon are nearly in a line and pull together
Neap Tide
A tide with the smallest difference between a high and low tide. This occurs around a first or third quarter moon when the suns pull is at a right angle to the moons pull.
Rotation
the spinning motion of a celestial object on its axis. (1day)
Revolution
the spinning motion of a celestial object around another object. The earth makes a revolution around the sun in a year.
What two factors determine the strength of the force and gravity between two objects
Their masses and the distance between them.
Who was the first to discover that gravity occurs everywhere?
Isaac Newton
True/False: forces on earth are different from those elsewhere in the universe.
False
