Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
92 Cards in this Set
- Front
- Back
|
Every change in motion (that you feel or observe) is caused by...
|
force
|
|
|
Force causes every
|
change in motion
|
|
|
Newton's first law
|
An object at rest remains at rest and an object in motions maintains its velocity unless it experiences a net force.
|
|
|
An object at rest remains at rest and an object in motions maintains its velocity unless.....
this is : BLANK law |
it experiences a net force
Newton's first law |
|
|
Objects change their state of motion only when a net force is applied :
BLANK law |
Newton's first law
|
|
|
Objects change their state of motion only when ...
BLANK LAW |
a net force is applied
Newton's first law |
|
|
The tendency of an object to resist a change in motion unless an outside force acts on the object
|
inertia
|
|
|
inertia
|
The tendency of an object to resist a change in motion unless an outside force acts on the object
|
|
|
The tendency of an object @ rest to remain @ rest or if moving to continue moving at a constant velocity.
|
inertia
|
|
|
An object that has a small mass can be accelerated by a
|
small amount of force.
|
|
|
Mass is a measure of inertia T OR F
|
T
|
|
|
What is the measure of inertia?
|
Mass
|
|
|
Mass is a measure of what ?
|
Inertia
|
|
|
AN object whose mass is small has
|
less inertia
|
|
|
How much inertia does a object with a small mass have?
|
small inertia , less than large mass objects
|
|
|
Newton's first law is sometimes called the
|
law of inertia
|
|
|
law of inertia sometimes called
|
Newton's first law
|
|
|
Because of BLANK
you appear to slide toward the side of a car when the driver makes a sharp turn. You continue in the same direction while the car makes the turn. |
Inertia
|
|
|
Because of BLANK you cannot stop a car , plane , bike instantaneously
|
Inertia
|
|
|
Newton's first law describes what happens when ...
|
no net force is acting on an object
|
|
|
What happens when the net force is zero ?
|
WHen the net force is zero newtons second law applies. AKA nothing will happen
|
|
|
Newton's second law describes the effect of an ...
|
unbalanced force on the motion of an object
|
|
|
Newton's second law
|
the unbalanced force acting on an object equals the objects mass times its acceleration
|
|
|
tendency of an object to resist force
|
1st law
|
|
|
net force = mass x acceleration
|
2nd law
|
|
|
F = ma
|
2nd law
|
|
|
the unbalanced force acting on an object equals the objects mass times its acceleration
|
2nd law
|
|
|
The unbalanced force on an object determines how much an object
|
speeds or slows down
|
|
|
What determines how much an object speeds or slows down
|
The unbalanced force on an object
|
|
|
Force is measured in ...
|
Newtons
|
|
|
Newtons measure ...
|
Force
|
|
|
Which law can be used to derive the SI unit of force , the newton
|
2nd Law
|
|
|
Besides Newtons BLANK can also be a measurement of force
|
the pound
|
|
|
Acceleration depends on..
|
FOrce and mass
|
|
|
A= F/m
|
2nd law
|
|
|
.2 gravity is not as strong on moon or earth
|
moon
|
|
|
.2 The force on an object due to gravity is called..
|
Weight
|
|
|
weight
|
the force of an object due to gravity
|
|
|
a measure of the gravitational force exerted on an object
|
weight
|
|
|
The BLANK near a massive onject is a constant acceleration that all masses near that object experience.
|
Free Fall accleration
|
|
|
Mass
|
Measure of the amount of matter in an object
|
|
|
the gravitational force that an object experiences because of its mass
|
Weight
|
|
|
Diff between mass and weight
|
Measure of the amount of matter in an object - mass
the gravitational force that an object experiences because of its mass |
|
|
All objects in the universe attract each other through the...
|
force of gravity
|
|
|
Universal gravitation equation
|
F= G m1 m2 /d^2
pg 405 |
|
|
Easy to understand the force of gravity between two masses if you consider it in two parts:
|
1. The size of the masses and 2. the distance between the masses
|
|
|
Gravitational force is BLANK between objects that have small masses
|
weak
|
|
|
Gravitational force is BLANK when one or both objects are larger
|
Stronger
|
|
|
Gravitational force rapidly becomes BLANK as the distance between two masses increases.
|
Weaker
|
|
|
Gravitational force BLANKS as mass increases
|
increases
|
|
|
Gravitational force BLANKS as distance increases
|
decreases
|
|
|
Which force is weaker than other types of forces
|
Gravitational force WHY ????
Gravitational constant G is small # |
|
|
When is an object said to be in free fall
|
When Earth's gravity is the only force acting on an object
|
|
|
Free fall acceleration is directed ...
|
toward the center of the Earth
|
|
|
In the absence of air resistance all objects falling near earths surface....
|
accelerate at the same rate regardless of their mass
|
|
|
all objects falling near earths surface
accelerate at the same rate regardless of their mass when .... |
there is no air resistance
|
|
|
Does a heavy object or a light object have a greater gravitational force?
|
A heavy object has a greater gravitational force.
|
|
|
Is it harder to accelerate a heavy or light object
|
harder to accelerate a heavy object, because it has more mass.
|
|
|
Free fall acceleration is constant because of the law of
|
Universal gravitation
|
|
|
What two forces act on an object as its moving through the earths atmosphere?
|
air resistance and gravity
|
|
|
A falling object stops accelerating when the BLANK
|
force of air resistance becomes equal to gravitational force on the object.
|
|
|
Terminal velocity
|
The constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
|
|
|
When an object stops accelerating and reaches its max. velocity it is called
|
Terminal velocity
|
|
|
The constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
|
Terminal velocity
|
|
|
Are objects weightless in space?
|
no , gravitational force is weak but no where in the universe can you be completely weightless
|
|
|
Apparent weightlessness
|
astronauts experience while orbiting because they are in free fall.
|
|
|
Projectile motion
|
the curved path that an object follows when thrown , launched or otherwise projected near the surface of the Earth
|
|
|
the curved path that an object follows when thrown , launched or otherwise projected near the surface of the Earth
|
Projectile motion
|
|
|
Ex of Projectile motion :
|
Motion of leaping frogs , thrown balls and arrows shot from a bow
|
|
|
Two components of Projectile motion :
|
Horizontal and vertical when two motions combined they form a curved path
|
|
|
Two components of BLANK are independent
|
Projectile motion
|
|
|
Two components of Projectile motion are..
|
independent
|
|
|
Horizontal motion
|
motion that is perpendicular or at a 90 degree angle to Earth's gravitational force
|
|
|
Newton's third law
|
For every action force there is an equal and opposite reaction force.
|
|
|
For every action force there is an equal and opposite reaction force.
|
Newton's third law
|
|
|
Forces happen in ..
|
pairs
|
|
|
Action and reaction forces never
|
act on the same object
|
|
|
Do Action and reaction forces ever act on the same object
|
nope
|
|
|
these two things never act on the same object
|
action and reaction forces
|
|
|
Large truck and fast moving care have more ....
|
momentum than the small car and the slow moving one do
|
|
|
momentum is a property of
|
all moving objects
|
|
|
What is a property of all moving objects?
|
momentum
|
|
|
For movement along a straight line, momentum is calculated by :
|
Multiplying an objects mass and velocity
|
|
|
Momentum equation:
|
momentum = mass x velocity
p= mv |
|
|
momentum = mass x velocity
|
momentum equation
|
|
|
p=mv
|
momentum equation
|
|
|
momentum increases as Blank and Blank increase
|
mass and velocity
|
|
|
momentum increases as mass and velocity BLANK
|
increase
|
|
|
If an object is not moving , it s momentum is BLANK
|
Zero
|
|
|
Law of conservation of momentum :
|
the total amount of momentum in isolated system is conserved
|
|
|
the total amount of momentum in isolated system is conserved :
|
Law of conservation of momentum
|
|
|
The total momentum of two or more objects after a collision is the same as it was before the collision
|
Law of conservation of momentum
|
