Dynamics And Space Flashcards
What is weight and its unit?
Measure of how strong gravity pulls on the matter (N)
What is mass and its unit?
Measure of how much matter an object has
Kg
Newton’s first law
An object at rest tends to stay at rest and an object in motion stays in motion at a constant speed, if the forces on it are balanced
Newton’s second law
When an object experiences an unbalanced force, it accelerates in the direction of that unbalanced force
Newton’s third law
If object A excerpts a force on object B, then object B will excerpt an equal but opposite force on object A
Mention what the size of an objects acceleration depends on?
The mass of the object
What happens when we divide weight by mass?
The value is always approx. equal to the gravitational field strength on earth
What is the gravitation field strength on earth??
9.8 Nkg-1
Definition of a light year
Lighthearted is the DISTANCE light travels in ONE YEAR
1 light year is equal to??
9.4608x10-15 m
What is “newtons pairs”
Two objects excreting forces on each other, as describes by newtons 3rd law
Eg. A snooker cue hitting a ball
NEWTONS PAIR: cue and ball
What is gravitational field strength?
Weight of 1 kilogram of the strength of gravity in a certain place
Nkg-1
Planet
Large spherical object that orbits a central star
Moon
Natural satellite of a planet
Star
Huge burning ball of gas undergoing nuclear fusion
Centre of solar system
