Chapter 12 Flashcards
(26 cards)
To reach constant velocity you must have a net force of
Zero
All objects will get to terminal velocity if
Friction is involved
Newton’s second law
A=Net force/mass or F=ma
When an object is not moving all the forces are
Balanced
When an object is moving but not accelerating
All forces are balanced and the net force equals zero
When there is air resistance the objects net force is
Less than its weight
The air resistance of an object depends on what 2 factors
The surface area (frontal area)
And
The speed of the object
If acceleration equals gravity then?
The object is in free fall
When acceleration is less than gravity what is present
Friction
When acceleration is less than gravity, gravity ______
Decreases
When there is terminal velocity what is present
Friction
When acceleration is equal to gravity _______ increases as time goes on
Velocity
Impulse
Product of force and this time interval
Momentum
P=mv
Kg m/s
Decreasing momentum over a long time will?
Make smaller force results
Newtons 3rd law
Every object that exerts a force on an object the second object will exert an equal and opposite force on the object that applied the force to it
The more mass an object has the ______ it accelerates
Slower
An object with the least mass is going to _____the fastest
Accelerate
How do resultant vectors compare to the weight of a ball
Same but opposite direction
If the forces are equal the net force is
Zero
If a force is exerted on a object but not enough to move it friction is
Equal too the pull
Constant velocity mean acceleration is at
Zero
When acceleration equals gravity the object is in
Free fall
When acceleration is equal to zero there is
No movement or no acceleration
