How do we describe motion?
-Speed
*rate at which objects move
-Velocity
* speed and direction
-Acceleration
* any change in velocity.
Acceleration
*All falling objects accelerate not counting friction of air resistance
How is mass different from weight?
Mass
-the amount if matter in an object
Weight
- The amount of force that acts on an object.
How did Newton change our view of the universe?
He realized the same physical laws that operate on Earth also operate in the heaven
He discovered laws of motion and gravity
Much more: Experiments with light first reflecting telescope calculus....
What are Newton's three laws of motion?
1. An object moves at constant velocity unless a net force acts to change its speed or direction.
2.Force = mass x acceleration
3.For every force there is always an equal and opposite reaction force.
What keeps a planet rotating and orbiting the Sun?
Conservation of momentum
Total momentum of interacting objects cannot change unless an external force is acting on them.
Interacting objects exchange momentum through equal and opposite forces.
Where do objects get their energy?
Energy makes matter move.
energy is conserved but I can....
-transfer from one object to another
What determines the strength of gravity?
The universal law of gravitation
1.every mass attracts every other mass.
2.Attraction is directly proportional to the product of their masses
3.Attraction is inversely proportional to square of the distance between their centers
How does Newton's law of gravity extend Kepler's laws?
*if a small object Orbits a large one and you measure the objects.
How do gravity and energy allow us to understand orbits?
Total orbital energy stays constant if there is no external force
orbit cannot spontaneously change
How does gravity cause tides?
The moon's gravity pulls harder on near side of earth than on far side.
The difference in the moon's gravitational pull stretches earth.
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