Newtons Laws Flashcards
State Newton’s second law
Mass resists acceleration (INVERSELY PROPORTIONAL) forces cause acceleration (DIRECTLY PROPORTIONAL)
Definition of weight
Weight is the amount of force that the earth (ECT) exerts on an object
Why do heavier objects hit the ground faster then lighter objects
Because they can push air out if the way faster
When to objects collide in the absence of friction momentum is
A. Lost
B. Not lost
Not lost
Sliding friction
Occurs when solid surfaces slide over each other
Rolling friction
Occurs when and object rolls over another
—- never changes but —— is different with gravity differences
Mass. Weight.
Which friction requires the most energy to overcome
Sliding friction
Definition of mass
How much stuff there is of an object
What unit do you use for speed
M/S
Static friction
Is the force acting on objects that are not moving. Must be overcome for objects to move
What formula do you use to calculate weight
F = ma
The first law is also called the law of ——-
Inertia
Inertia is directly proportional to
Mass
Formula to calculate acceleration
A = f/m
Is net force scalar or vector
Vector
What causes acceleration
Forces
Is momentum a scalar or vector quantity
Vector
Formula to calculate momentum
P = mv
The higher the velocity and mass the higher the
Momentum
What unit do you use for momentum
Kg m/s
State Newton’s third law
For every action there is an equal and opposite reaction
The ratio of force to mass is
Directly Proportional
What unit do you use for acceleration
M/ S 2
Fluid/viscous friction
Occurs when objects move through fluid
If you fall from a plane your velocity increases and your acceleration
Decreases
—– always opposes motion
Inertia
A car is moving at a constant velocity. Are the forces balanced or unbalanced
Balanced
Definition of momentum
Bashing power
What unit do you use for net force
Newtons
Lighter objects have —- air resistance
More
How much acceleration is there at terminal velocity
None
The law of conservation of momentum states
The total momentum of any group of objects remains the same unless acted on by outside objects
Air resistance ——– as you fall
Increases
Increase mass ——– air resistance
Decrease
Define Vector
Magnitude and direction
What happens to an object when unbalanced forces act on it
It’s motion changes
State Newtons first law
Objects in rest will stay in rest and objects in motion will stay in motion unless acted on my an unbalanced force
Define force
A push or pull described by its strength and direction
If friction on a plane was greater than the thrust the plane would ——–
Slow down
Traveling at constant velocity is using what kind of forces
Balanced
At terminal velocity you fall at a ——– speed
Constant
