Level 110 Level 112
Level 111

Circular Motion & Gravitional Force


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circular motion
any motion in which an object is moving along a curved path
radius
A straight line from the center to the circumference of a circle or sphere.
Centripetal Force
A force directed towards the center of a circle that causes an object to follow a circular path
centripetal acceleration
a = centripetal acceleration
centrifugal force
a fictitious force that tends to throw an object off when the object is rotating in a non-inertial frame of reference
rotational interia
decreases the farther the object is away from the center of the motion
tangentail velovity
an object with circular motion has a velocity that is tangent to the circular path
universal gravity constant
a number that relates the gravitional force of two objects to the mass of two object compared to the distance between the two objects
weakest
gravitionla force is the _______ of the four universal forces
Keplers 1st law
each planet orbits the sun in a path called an ellipse with the sun at one focus
Kepler's 2nd law
line sconnecting a planet to the sun will sweeo the same area during the same period of time
Keplers 3rd Law
planets closest to the sun have shorter periods than those further from the sun
Revolution
1 cycle = 1 year, 365 days; earths orbit around sun
Rotation
1 cycle = 1 day, 24 hours; spinning of earth on axis 23 1/2 degrees
Orbit
Is a curved path that objects follow when influenced by large gravitational bodies such as planets or stars.
satellite motion
the projectile motion of an object with enough velocity to orbit around the earth
Decrease
As the mass of an object decreases, its inertia will __
Johannes Kepler
A german astronomer who created the three laws of planetary motion
Scientific Notation with universal Gravity
- The universal gravity constant (6.67 x 10-Nm2/Kg2 is extremely small.
MASS or DISTANCE
We can use the formula to determine what happens to the gravitl force based on changing the _______ or _______ of two obects.
We then put the number in that REPRESENTS the CHANGE in measurement.
Because we are only determing the change in gravitational force (Fg), we don't need to use ACTUAL MEASUREMENT.
EE
a button that replaces the X10 in a number with scientific notation
G=
6.67E
Centripetal vs Centrifugal Force
1.Centrifugal Force : A Fictitious force that is the OPPOSITE of centripetal force.
Examples of Centripetal Force:
moon rotation around earth
If the centripetal force is REMOVED from the motion,
the object will move in a STRAIGHT LINE and not continue to travel in a CIRCULAR PATH.
Torque
A "force" that causes rotation because it is exerted at a distance from the axis of rotation.
Center Point
Torque is created when a platform rotates around a _______.
Fulcrum
The CENTER POINT in which a LEVER is rotated which. (Also known as PIVOT).
What creates TORQUE?
The distance between the FORCE and the FULCRUM.
Ways Torque can be used.
To start, stop, speed up or slow down circular motion. Used to change circular motion.
motion
An object is moving if its position relative to a fixed point is changing.
Force and distance
Torque is based on the relationship between:
Increases
As temperature increases, the vapor pressure of a liquid _______.
The torque increases
What happens to torque when the DISTANCE from the fulcrum increases?
What happens when the torque stays the same?
The distance and force act INVERSLY on eachother.
Torque stays the same:
Force increases then distance decreases
Torque is described as:
the rotation placed on a platform.
How can torque be decribed?
As either clockwise (CW) or counter clockwise (CCW).
Right
Clockwise(CW) is to the _______ of fulcrum.
Left
Counter Clockwise (CCW) is to the _______ of the fulcrum.
Formula for torque with rotational equilbrium-
Be able to describe the formulas for torque:
T
1/f
N*M
The units for torque is?
T=F*d
The formula for torque is
m*g
Because torque is based on the force of weight (Fw) force can also be calculaed as?
equilibrium
1)starting point of SHM, object is in _______, fnet equals zero
Rotational Equilibrium
When the TORQUE acting on an object cancels out . Not moving or rotating with constant velocity.
If the object does not have rotational equilibrium:
then the counter clockwise torque (tccw) is DIFFERENT then the clockwise torque (tcw).
OPPOSITE
Counter clockwise (ccw) and clockwise (cw) are _______opposite directions, just _______.
How to calculate the direction of the largest torque (t)
Just like torvectors in opposite directions, we can SUBTRACT the torques and the final torque (t) will be the direction of the largest