The Variables
The variable that represents displacement
What is X or Y
The unit for time (typically)
What is second - s
What is the final speed of an object that starts from rest and accelerates uniformly at 4.0 m/s2 over a distance of 8.0 m?
What is 8.0 m/s
A small ball is released from a window. Assuming free-fall conditions, how far does it travel in 2.8 seconds?
What is 38.46 m down or -38.46 m
When displacement occurs in the westward direction, the sign (- / +) will be...
What is negative (-)
The variable that represents velocity
What is v or vi or vf
The unit for velocity
What is meter per second - m/s
A skater increases her speed uniformly from 2.0 m/s to 7.0 m/s over a distance of 12.0 m. The magnitude of her acceleration as she travels this 12 meters is...
What is 1.88 m/s2
A kangaroo is capable of jumping to a height of 2.62 m. Determine the takeoff speed of the kangaroo.
What is 7.17 m/s
When velocity occurs in the northern direction, the sign (-/+) will be...
What is positive (+)
The variable that represents time
What is t
The unit for displacement
What is meter - m
A hockey puck slides 55.0 m along the length of the rink in just 1.25 s. If the puck's final speed is 43.2 m/s, what is the puck's initial speed?
What is 44.8 m/s
A cat, wishing to investigate the laws of physics, jumps out of a second floor window and falls through a height of 7 m. Calculate the velocity of the cat just before it lands and how long the fall takes.
vf = 11.72 m/s down or -11.72 m/s
t = 1.19 s
What variables can be positive when solving kinematic equations?
What is all of them!
The variable that represents acceleration
What is a
The unit for acceleration
What is meter per second squared m/s2
An electric train moving at 5.56 m/s accelerates to a speed of 8.33 m/s in 20.0 s. Find the distance travelled during the period of the acceleration.
What is 138.9 m
Upton Chuck is riding the Giant Drop at Great America. If Upton free falls for 2.60 seconds, what will be his final velocity and how far will he fall?
vf = 25.5 m/s down or -25.5 m/s
y = 33.16 m down or -33.16 m
What type of force is IGNORED during free fall?
What is air resistance
The variables that "change" when discussing vertical motion vs horizontal motion
What is x -> y and a -> g
The value and unit for acceleration due to gravity
What is -9.81 m/s2
A car is rolling toward a cliff with an initial speed of 15 m/s. The maximum negative acceleration that the brakes can provide is -0.3 m/s2. If the cliff is 350 m from the initial position of the car, will the car go over the cliff?
What is yes (it takes a distance of 375 m for this diva to stop in time!)
In Acapulco, divers dive from a rock 36 m above sea level. Assuming that air resistance is negligible, calculate how long the dive lasts, and the speed at which the divers hit the water.
t = 2.71 s
vf = 26.58 m/s down or -26.58 m/s
If a car is moving in the eastern direction and the driver applies the brakes, in what direction is acceleration occurring?
In the western direction (to slow the car down, acceleration must be opposite of velocity)