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;
30 Cards in this Set
- Front
- Back
|
If a question gives initial and final velocities, and time, what formula would be used to find displacement?
|
d = 1/2 (vo + v)t
|
|
|
If initial velocity, acceleration, and time are given, what formula would be used to find final velocity?
|
v = vo + at
|
|
|
If initial velocity, time, and acceleration are given, what formula would be used to find displacement?
|
d = v(initial)t +/- a(t^2)
|
|
|
What formula would be used to find final velocity independent of time?
|
v(final)^2 = v(initial)^2 + 2ad
|
|
|
What is the formula for average velocity?
|
v(avg) = (change in d)/(change in t)
|
|
|
What is the difference between averge speed and average velocity?
|
Average speed is the total distance traveled per time. Average velocity is the total displacement traveled per time.
|
|
|
What is happenening to an object's speed if its acceleration is in the same direction as its velocity?
|
Its speed is increasing.
|
|
|
If an object's acceleration is perpendicular to its velocity, what is happening?
|
Its speed is constant, but the direction of the velocity is changing.
|
|
|
If an object's acceleration is opposite its velocity, what is happening?
|
The object's speed is decreasing.
|
|
|
If acceleration is occuring at an angle between 0 and 90 degrees, what is happening?
|
The object's speed is increasing and its direction is changing.
|
|
|
If acceleration is occuring at an angle between 90 and 180 degrees, what is happening?
|
The object's speed is decreasing and its direction is changing.
|
|
|
State Newton's first law.
|
An object will resist changes in its velocity.
|
|
|
State Newton's second law.
|
The sum of the forces acting on an object are the product of its mass and the sum of all acceleration vectors.
F = ma |
|
|
State Newton's third law.
|
F(2 on 1) = -F(1 on 2)
|
|
|
What is force?
|
Force is a push or pull exerted by one object on another.
|
|
|
What is the relationship between a force and its acceleration?
|
Because mass is a positive quantity, the force an object feels always occurs in the direction of its acceleration.
|
|
|
If an object has a net force of 0, will the object move?
|
If the object is already in motion, yes.
|
|
|
Describe Newton's Law of Gravitation (and formula)
|
Every object in the universe exerts a gravitational pull on every other object in the universe.
F(grav) = (GMm)/r^2 |
|
|
Describe the relationship between an object's weight and Newton's Law of gravitation.
|
F(grav) = mg, so:
mg = (GMm)/r^2 g = GM/r^2 |
|
|
What is an object's normal force?
|
Normal force is the force a surface exerts on objects resting upon it. If an object is resting on a flat, horizontal surface, its Fnet = 0. The object's gravitational force = -mg. The object's normal force = mg.
|
|
|
What is kinetic friction?
|
Friction that occurs when there is relative motion between two surfaces.
F(f, max) = u(s)Fnormal |
|
|
What is static friction?
|
The maximum force of static friction is the amount of force required to initiate motion in a resting object.
F(f) = u(k)Fnormal |
|
|
What is the force due to gravitiy acting parallel to an ojbect on an inclined plane?
|
mg sin theta
|
|
|
What is the normal force exerted by the inclined plane on an object?
|
mg cos theta
|
|
|
Describe an object's center of mass.
|
The point at which all mass of an object is concentrated.
|
|
|
Describe an object's center of gravity.
|
The point at which the total gravitational force on a system can be considered to act.
|
|
|
Define uniform circular motion.
|
An object moving in a circular path with constant speed.
|
|
|
What is the formula for centripetal acceleration?
|
a(c) = v^2/r
|
|
|
What is the formula for centripetal force?
|
F(c) = ma(c)
|
|
|
What is centripetal force?
|
The force required to keep an object moving along a circular path.
|
