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Level 84

Force in Two Dimensions


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component
A part or element of a larger whole.
Vector Resolution
the process of breaking a vector into its components
Kinetic Friction
Friction between moving surfaces
static friction
A car drives with its tires rolling freely. Is the friction between the tires and the road kinetic or static?
Coefficient of kinetic friction
the kinetic friction force equals the product of the coefficient of kinetic fraction and the normal force.
Coefficient of static friction
the maximum static friction force that must be overcome before motion can begin
Equilibrant
A force that causes an object to be in equilibrium
components
parts of a vector, one is parallel to the x-axis and the other one is parallel to the y-axis
Resultant
A vector sum (includes a magnitude and a direction)
friction
a contact force; type of force between two touching surfaces
equilibrium
1)starting point of SHM, object is in _______, fnet equals zero
vector components
the lengths of a vector along specified directions
relative motion
Movement in relation to a frame of reference
projectile
An object in the air that is only subject to the force of gravity and wind resistance after it leaves the ground.
range
distance a projectile travels horizontally along the ground
Pythagorean theorem
How to find the lengths of a right triangles sides
When do you use the Law of cosine's
When you are given to the actors and the angle between the two vectors
When is it best to use the law of sines?
When you are given to angle measurements and only one Vector magnitude
Law of Sines
R/sin theta= a/ sin a= b/sinb
Law of cosine's
r2= A^2 +B^2-2Abcostheta
A=ax+ay
What is the equation that relates a vector to its components
Counterclockwise from the positive Y axis
Where do we always measure the angle from
Ax=Acostheta
Equation to find the X component of a vector
Ay=Asintheta
Equation to find the Y component of a vector
Victor components in the first quadrant
Ax is positive Ay is positive
Vector components in the second quadrant
A X is negative a Y is positive
Victor components in the third quadrant
AX is negative a Y is negative
Vector compliments in the fourth quadrant
A X is positive a Y is negative
Theta= tan^-1 (ay/ax)
How to find the vectors direction
Ff kinetic=mkfn
Equation for Kinetic friction
The coefficient of static friction
The maximum static friction force
Parallel to the inclined plane
Where should you place the coordinate system
2Ftsintheta=mg
The equation for the force of a person on a rope
Mk=
A/g
trajectory
Path of a projectile
Projectile Motion
2D Motion in which the object moves at a constant velocity in one direction and accelerates in another
because the vertical and horizontal do not affect one another
why is it we can break our motion into components (x=horizontal y=vertical)
parabola
A U-shaped curve characteristic of the graphs of quadratic equations
Constant
If an object is acted on by a non-zero net external force, its momentum will not remain _______
horizontal force
what does NOT act on the projectile
constant velocity
An object that has the same average velocity for all time intervals is moving at _______
change in direction
objects are acceleration because of...
Uniform Circular motion
A particle moves in a circle with a constant speed
centripetal acceleration
a = centripetal acceleration
Period (T)
the time for an object to complete one revolution
circumference
2pi x r
Centripetal Force
A force directed towards the center of a circle that causes an object to follow a circular path
Velocity
a speed in a particular direction.
center
acceleration and force
no initial vertical velocity
horizontal does not have what?
free fall
a state in which an object is gravitationally drawn to the earth's surface and is unaffected by any forces besides weight
Gravitational Force
(physics) the force of attraction between all masses in the universe
Law of Universal Gravitation
a force of gravity that's acts on all objects in the universe