Momentum, Impact, Force
The change in momentum, or F*t
What is impulse?
In addition to momentum, this other quantity is conserved in a perfectly elastic collision
What is kinetic energy
If we solve for a vector using pythagorean theorem, we must also use this other equation to have a complete answer.
What is inverse tangent?
Technically, this is the term for any collision where kinetic energy is not conserved.
What is an inelastic collision?
When an object/ system of objects separates into pieces.
What is an explosion?
pg 216 #19) When tossed upward and hit horizontally by a batter, a .2kg softball receives an impulse of 3.0 N*s. With what horizontal speed does the ball move away from the bat?
15 m/s
Two cars are driving in the same direction. The driver of Car 1 (955 kg, 22.5 m/s North) is from Jersey, so they rear-end Car 2 for going too slow (1250kg, 15 m/s North). After the collision, the scientific principle of karma results in Car 1 only travelling 12.5 m/s North (ha ha). What is the velocity of Car 2?
22.64 m/s
A 2kg ball at 3m/s East collides with a 4kg ball at 5 m/s North. If they stick together, what are the components of its velocity? What is the angle of its velocity?
vx= 1 m/s
vy=3.33 m/s
Angle 73.3 degrees
A 1200kg clown car heading 25 m/s East collides and somehow flips on top of a 1500kg clown VAN that was parked in the Sheetz parking lot. What was the velocity of the clown vehicle combo?
11.11 m/s
0.083 m/s towards the capsule
A 2kg sandball hits the ground at 17 m/s. The impact with the ground lasts 0.5s. What is the average force by the ball on the ground?
-68.6N
(this is number 14 from the book, but I gave you the final velocity instead of you solving for it)
Two cars are driving in opposite directions. Car 1 (1250 kg, 15 m/s East) tries going around an Amazon truck and gets absolutely smacked by Car 2 (955kg traveling 22.5 m/s West). They pull up their magical forcefields just in time and bounce off each other at 12m/s West and 12.5m/s East, respectively. Prove whether or not it is elastic.
Definitely not elastic (show me some KEs to prove it)
A 2000kg bus of Creighton basketball players is heading West at 24.75m/s and collides with the Duke team bus (2000kg) that was traveling NE at 35 m/s. The team gear takes the brunt of the impact, but the buses are now stuck together... What is the velocity (not speed) of the combo in the aftermath of the collision?
1237m/s North
A 1200kg clown car heading 25 m/s East collides and somehow flips on top of a 1500kg clown VAN that was also heading East at 20 m/s (must be a convention that way). What was the velocity of the clown vehicle combo?
22.22 m/s
pg 217 #38 A 65kg man and a 45kg woman stand facing each other on skates on ice. If they push apart and the woman has a 1.5 m/s velocity eastward, what is the man's velocity?
1.04 m/s
When jumping on a pogo stick, the spring exerts 1.5 second bursts of 150N up. If a 25kg kid has a velocity of 4 m/s when landing on the ground (just before the spring in the pogo stick starts to compress), what is their velocity AFTER the spring force (as they bounce back up)?
5 m/s up
Hayden and Liv are duking it out to be drum major, so they throw their instrument cases at each other. Somehow, it is a perfectly elastic collision. Liv's 2kg clarinet case travels at 6 m/s right towards Hayden's 4kg trumpet case traveling left at 6 m/s. What are their final velocities?
Clarinet case is -10 m/s
Trumpet case is 2 m/s
A 1kg puck slides 2.5 m/s East into a stationary 1kg puck. The pucks bounce and the first has a 1.5m/s velocity 30degrees SoE. What is the velocity of the second puck after the collision?
1.42 m/s at 32.01 NoE
One angry 30kg toddler (they had their firetruck stolen!) runs towards a fellow 15kg toddler (ready to bite in defense).
The tackle moves them to the right with 0.33m/s of velocity. What could their initial velocities have been? Show the ratio/equation you used (no trial and error, or the toddler is coming to bite you next).
v2=1-2v1
(1; -1), (2; -3), (3; -5)
pg 217 #40. A 3kg object at rest explodes into 3 pieces.
*Piece 1 is .5kg and flies 2.8 m/s West.
*Piece 2 is 1.3 kg and flies 1.5 m/s South.
What is the speed and direction of piece 3?
2 m/s at 54.56 degrees NoE