Struggle Deck Flashcards
Inverse proportionality graph
Equation: conservation of energy
KEf + PEf = KEi + PEi
When there is a transfer of energy to a projectile, how does the projectile’s mass affect its velocity and range?
A heavier object will have less initial velocity and less range.
Does air resistance affect x or y velocity?
both x and y velocities
What does an 1H NMR J-value represent?
the distance between adjacent spikes within a peak
Equation: kinetic energy
KE = (1/2)mv2
If an object has 0 y-velocity, what determines its length of time in flight?
height
What is the maximum value for gravitational potential energy?
0
True/False: an object cannot accelerate if it is moving at a constant speed
False: it can maintain a constant speed but change directions
Which type of collision generally imparts a bigger change in momentum to colliding objects?
elastic
Any time an object moves in a circular path, what is the net force equal to?
centripetal force
Backspin has what effect on a ball’s direction?
It causes the ball to rise.
On a velocity v. time graph, what does the area under the curve represent?
displacement
Are halogens added or subtracted when calculating units of unsaturation?
subtracted
What is deuterium?
2H: hydrogen has an extra proton (“heavy” hydrogen)
Equation: projectile: speed at any point in motion
speed = √(vx2 + vy2)
At the apex of a projectile, which has a value of zero: speed or velocity?
Neither - although y-velocity is zero, x-velocity is constant.
What kind of friction prevents slipping?
static friction
How do units of unsaturation affect a compound’s entropy?
They decrease entropy because it does not have as much freedom to move and rotate.
Equation: potential energy due to gravity
PE = mgh
Equation: free fall: time in flight
t = √(2h/a)
Reduction of an alkene by H2 and palladium (pd) metal adds in which orientation?
syn
For linear momentum to be conserved, there must not be what?
external forces acting on the system
What is the effect of air resistance on a parabolic projectile’s x direction (range) and y direction (time and height)?
Since it is parabolic, y-direction time is the same (opposite effects up and down). The height it reaches is lower.
X-direction range is shorter, because it slows horizontal velocity.
Does air resistance affect an object sliding down a ramp?
No - it only affects objects moving through the air.
With constant acceleration, is a velocity vs. time graph exponential or linear?
linear
Equation: free fall: height
d = (1/2)at2
For an object sitting on an inclined plane, how does the normal force relate to its weight?
N < mg
Equation: Impulse of collision (Force)
|F| = mΔv/Δt
If KE changes over an object’s motion, is it conserved?
no
Which two forces are equal for an orbiting body?
gravitational and centripetal
When energy is lost to friction, how does PEi compare to KEf?
PEi > KEf
Any time an object moves in a circular path, what is the net acceleration equal to?
centripetal acceleration
If an object on a string is swung in a vertical circle, the tension in the string will be greatest at what point?
at the bottom of the circle
