# Shared Flashcard Set

## Details

Mechanics Review Flash Cards
For AP Physics C: Mechanics Review
19
Physics
11/25/2008

Term
 What is the first kinematic formula?
Definition
 Δx = v0xt +1/2at2
Term
 What is the second kinematic formula?
Definition
 vf2 = v02 + 2a(Δx)
Term
 What is the third kinematic formula?
Definition
 vf = v0 +at
Term
 What is the fourth kinematic formula?
Definition
 Δx = (1/2)(v0 + vf)t
Term
 When can you use the kinematic equations to solve for variables in an object's motion?
Definition
 When the acceleration is constant, you can use the kinematic equations. Otherwise, you must use the defintions of velocity and acceleration to solve for an object's motion.
Term
 What is the mathematical definition of acceleration, both in algebra and calculus?
Definition
 a = Δv/Δta = dv/dt
Term
 What is the mathematical definition of velocity, both in algebra and calculus?
Definition
 v = Δx/Δtv = dx/dt
Term
 Using the first, second, or fourth kinematic formula, when would you say your vertical displacement (Δy) is a negative number?
Definition
 When the object ends at a lower height than where it started...in other words, when it drops or falls.
Term
 Using the first, second, or fourth kinematic formula, when would you say your vertical displacement (Δy) is a positive number?
Definition
 When the object ends at a higher height than where it started...in other words, when it is thrown up or rises.
Term
 Using the first, second, or fourth kinematic formula, when would you say your vertical displacement (Δy) is 0?
Definition
 When the object ends at the exact same height it started at.
Term
 What are three different ways to accelerate an object?
Definition
 Make the object speed up, slow down, or change its direction.
Term
 What is the definition (in words) of acceleration?
Definition
 Acceleration is defined as the rate of change of velocity.
Term
 What is the definition (in words) of velocity?
Definition
 Velocity is defined as the rate of change of displacement.
Term
 A projectile is launched upward into the air at an angle. At the top of a projectile's path, what is the vertical velocity of the projectile?
Definition
 The vertical velocity is exactly 0 at the top of the path. This is because at this one instant, it is neither rising nor falling.
Term
 A projectile is launched upward into the air at an angle. At the top of a projectile's path, what is the vertical acceleration of the projectile?
Definition
 The vertical acceleration is 9.8 m/s2 downward. Though the projectile is not moving up or down at that instant, it is still accelerating downward.
Term
 A projectile is launched upward into the air at an angle. At the top of a projectile's path, what is the horizontal velocity of the projectile?
Definition
 While we don't have any numbers to plug in here, we know that it has the same horizontal velocity at the top of the path as it did when it was launched.If we did have numbers, we could say thatvx,top = v0cos(Θ)
Term
 A projectile is launched upward into the air at an angle. At the top of a projectile's path, what is the horizontal acceleration of the projectile?
Definition
 Since we only consider the force of gravity acting on the object, ax = 0 m/s2.If we considered air resistance and other external forces besides gravity, there may be a negative horizontal acceleration. Thankfully, this very rarely happens.
Term
 What is true concerning an object's vertical acceleration throughout its projectile path?
Definition
 It is always 9.8 m/s2. In other words, gravity never turns off!This is true for any projectile, regardless of whether it was thrown straight up and down, thrown at angle, or thrown from a moving object.
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