Chapter 12 Flashcards
An object tends to ____.
maintain its state of motion
-an object at rest remains at rest and an object in motion maintains its velocity unless it experiences a net force
Newton’s First Law
Why is it difficult to start a bowling ball rolling?
You have to overcome a lot of static friction because of the large mass of the object.
-the tendency of an object to resist a change in motion unless an outside force acts on the object
Ex. Crash Test Dummy
Inertia
-the unbalanced force acting on an object equals the object’s mass times its acceleration
Newton’s Second Law
Force is measured in _____.
Newtons (N)
1N= ___ lbs.
1N=0.225lbs.
1lb=____ N
1lb=4.448N
F=
ma
Look at the practice problems on page 401.
LOOOOOOOOOOOOOOOOOOOOOOOOOKKKKKKKKKKKKKKKK
thought this said look? haha, lol, no. legend of korra
_____ depends on force and mass.
Acceleration
a=
net force/mass
The acceleration of an object is _____ to the net force on the object and _____ to the object’s mass.
Directly proportional
Inversely proportional
1 N=
1kg x 1m/s2
-a measure of the gravitational force exerted on an object
Weight
g=
free-fall acceleration = 9.8 m/s
w=
mg
Weight is measured in _.
Newtons
Is weight different from mass?
Yes
What is mass?
A measure of the amount of matter in an object
Weight depends on ______.
gravitational force
Large land animals need ___ skeletons to support their mass against the force of gravity.
Large
Ex. Elephant
How does this apply to trees?
Their root system is normally as wide as their branches.
-states that all objects in the universe attract each other through gravitational force
Law of universal gravitation
F=
G (m1m2)/d2
-states the gravitational force increases as one or both masses increase and the gravitational force decreases as the distance between the two masses increases
Gravitational Equation
All matter is affected by _____.
Gravity
The force of gravity is easy to understand if you consider two points:
1)
2)
1) the size of the masses
2) the distance between them
Gravitational forces increases as _____ increases.
Mass increases
-the motion of a body when only the force of gravity is acting on the body
Free fall
Why is free fall acceleration constant?
Because of the law of universal gravitation
Give an example of free fall
Astronauts in orbit
What can balance weight?
Air resistance
Does a heavier object experience a greater or lesser gravitational force?
Greater
A heavier object is ___ to accelerate.
Harder
-the constant velocity of a falling object when that force of air resistance is equal to the magnitude and opposite direction to the force of gravity
Terminal velocity
the curved path followed by an object that is thrown, launched, or otherwise projected near the surface of the earth
Projectile Motion
What are the two components of projectile motion?
Horizontal and vertical
When the two motions are combined,
they form a curved path
Give an example of projectile motion.
Orbiting
-for every action force, there is an equal and opposite reaction force
Newton’s Third Law
Force always occurs in ____.
Give an example
Pairs
Ex. Sitting in your desk
Do forces in a force pair act on the same object?
No
Do equal forces always have equal effects?
No
-a quantity defined as the product of the mass and velocity of an object
Momentum
What are the units for momentum?
kg(m/s)
Ex. Pg. 415
p=
mv
What increases as mass and velocity increases?
Momentum
What is related to momentum?
Force
-the total amount of momentum in an isolated system is conserved
Law of Conservation of Momentum
Give an example of the Law of Conservation of Momentum.
Rocket Propulsion
Momentum is conserved in ____.
collisions
Momentum is _____.
transferred
