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Level 164

Magnet Force


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little g
variable used for designating the force of gravity, value depends on location.
G*m1m2/d^2=Force
Universal law of gravitation
Orbit
Is a curved path that objects follow when influenced by large gravitational bodies such as planets or stars.
Microwelds
Cause of friction by interacting with small bumps on surfaces
Law of Conservation of Momentum
If no external forces act on a system, then the total momentum of that system remains the same
m x a(mass*acceleration)
What is the formula for force?
F/a (Force/acceleration)
What is the formula for mass?
F/m (Force/mass)
What is the formula for acceleration?
Newtons(N)
What unit is force measured in?
kilograms (kg)
What unit is mass measured in?
meters per second squared(m/s2)
What unit is acceleration measured in?
They'd hit the water at the same time.
If you dropped a bowling ball and a marble from a bridge at the same time, which would hit the water first?
gravity
(physics) the force of attraction between all masses in the universe
air resistance
Fluid friction acting on an object moving through the air.
m x g (mass*gravity)
What is the formula for weight?
What does air resistance depend on?
size, shape,, density of an object
Terminal Velocity
Greatest velocity an object can reach is called _______.
Why does a parachute work?
The air resistance is large so terminal velocity is reached at a low value
Projectile Motion
2D Motion in which the object moves at a constant velocity in one direction and accelerates in another
Centripetal Force
A force directed towards the center of a circle that causes an object to follow a circular path
curved path
Due to Earth's gravitational pull and a projectile's own inertia, it will travel in a
acceleration
(physics) a rate of change of velocity
inertia
_______ is the property of an object that leads it to resist any change in motion
Newton's 1st Law
(Law of Inertia) an object in motion tends to stay in motion & an object at rest stays at rest unless acted upon by an outside force.
Newton's 2nd Law
A force on an object causes an object to accelerate in the same direction as the force
Newton's 3rd Law
A measure of the motion of a body equal to the product of its mass and velocity., For every action there is an equal and opposite reaction
Newton's 3rd Law (example)
Examples: recoil, A balloon flies forward when air quickly escapes from it
Newton's 1st Law (example)
Examples: A spaceship continues to orbit the moon even though its engines have been turned off, The moving boxes in the Bill Nye video just sit on the floor; they won't "move" to the moving van on their own.
Newton's 2nd Law (example)
Examples: Using a golf club, you hit a golf ball and a ping pong ball. The golf ball flies farther, It's harder to move a box of books than an empty recycling bin.
What causes the tides on Earth?
The force of gravity between Earth and the moon.
The Earth has 5/6 greater gravitational field then the moon.
What causes a person to weigh more on the Earth than on the moon?
Sir Isaac Newton
Gave us the 3 laws of motion
the mass of the objects and the distance between them
The pull of gravity between any two objects depends on (not a formula)
applied, magnetic , gravity, friction, air resistance
These are all types of forces (find 5 examples)
Reference Point
A _______ is a place or object used for comparison to determine if something is in motion.
constant speed
Moving at a steady rate over time
unbalanced force
force acting on an object that causes a change
net force
Acceleration depends on the
Addition
when two forces act in the same direction, they combine by... (math term)
Subtraction
when two forces act in the opposite directions, they combine by... (math term)
balanced forces
forces that are equal in size but opposite in direction
friction
a contact force; type of force between two touching surfaces
Fluid or viscous Friction
friction that occurs as an object moves through a liquid or a gas
momentum
(p) vector quantity describing the quantity of motion or inertia in motion. Recognizes that both mass and velocity have a part in the motion of an object and is proportional to both (is zero …
more difficult
the more momentum an object has, the _______ it is to stop
Free
When the only force acting on a falling object is gravity,the object is said to be in _______ fall.