044 SC 130 Physical science quiz four • Name:

05 February 2010

1. ____________________ Identify by the data point shapes (circles, squares, or diamonds) which of the mathematical relationships on the graph represents the time versus distance relationship for a RipStik moving at a constant linear velocity with no acceleration.
2. ____________________ Identify by the data point shapes (circles, squares, or diamonds) which of the mathematical relationships on the graph represents the time versus distance relationship for a ball dropped in the class room and falling to the ground through the air.
3. ____________________ Identify by the data point shapes (circles, squares, or diamonds) which of the mathematical relationships on the graph represents the height versus velocity relationship for a marble rolling from a height h down a banana leaf and onto a flat table.
4. ____________________ In laboratory four a 5.20 gram blue marble went a distance of 28.0 centimeters in 0.70 seconds. What is the velocity v for the marble?
5. ____________________ In laboratory four a 5.20 gram blue marble went a distance of 28.0 centimeters in 0.70 seconds. What is the momentum P for the marble?
6. ____________________ The blue marble in the problem above hits a white marble sitting on a ruler "marble" track. After the collision the blue marble has a momentum P of 75 g cm/s. What is the momemtum P of the white marble?
7. ____________________ Calculate the kinetic energy for a 30 kilogram child traveling at 1.5 m/s on a RipStik.
8. Riding a RipStik is inherently dangerous. Even after learning to balance, the greatest unexpected cause of accidents are small holes in the cement, cracks, and rocks. Hit head on at low speeds these cause the RipStik to come to a complete and sudden stop. Explain in terms of momentum what happens to the rider and why. Use the back.

Equations
[ d = ѵt ] [ ѵ = at ] [ d = ½at² ] [ d = ½gt² ] [ $a=\frac{\Delta ѵ}{\Delta t}$ ] [ p = mѵ ] [ GPE = mgh ] [ KE = ½mѵ² ]