Energy
Power and Work
Momentum
Collisions
Miscellaneous
100
A key word for kinetic energy is:
Motion, velocity, etc
100
What's the unit of power?
Watts
100
Momentum is a vector or a scalar?
Vector
100
During what type of collision is kinetic energy conserved as well as momentum?
Perfectly Elastic
100
What did I do this weekend?
Sang in a concert.
200
How much energy does a 70 kg rock climber have when they are 30 m high?
21 kJ
200
A sister pulls her little brother in a wagon for 20 m. If she pulls with a force of 50 N, directed upward at an angle of 30 degrees, how much work does she do?
866 J
200
If a 5 kg bowling ball moves at 3m/s, what is the momentum?
15 kg*m/s
200
I walk along a long log at 1.5 m/s. My mass is 100 kg, the log is 80 kg. What is the log's speed?
1.875 m/s
200
What color is a polar bear's skin?
Black
300
A runner has 875 J of energy when running at 5 m/s. How much energy do they have when running 10 m/s?
3500 J
300
A 100 kg man skis at a constant speed of 5.5 m/s. If the coefficient of friction is 0.08, how much power are they expending?
440 W
300
If a safety line can only handle 10,000N without breaking, what is the shortest amount of time it can stop a 50 kg box falling at 30 m/s?
0.15 s
300
A 4 kg snowball hits a 20 kg child at 10 m/s. How fast do the snowball and child move after the child is hit, assuming all the snow sticks to the child?
1.67 m/s
300
Who can kill two stones with one bird?
Chuck Norris
400
A block slides down a rough ramp that is 5 m tall. If the block reaches the bottom with a speed of 7 m/s, what percentage of the energy was dissipated by friction?
50%
400
This is the graph for work as a function of time. What is the power?
200 W
400
A force of F = 3t2 - 4 is applied for 4 seconds. What is the change in momentum for this object?
48 kgm/s
400
Jim throws a 0.5 kg ball at a 1 kg bottle with a speed of 10 m/s. If the bottle moves with a speed of 7 m/s, how fast is the ball now going?
-4 m/s
400
What state touches the most other states?
Missouri and Tennessee
500
A spring stores energy according to the equation, Us = 3x3 - 2x2-5. What is the equation for the spring force?
Fs = 9x2 -4x
500
A 100 kg box is pulled so that its position is given as x = t^3 +2t. Calculate the net work done from 0 to 2 seconds.
9600J
500
A baseball player claims they can throw a 0.35 kg baseball with the same energy as a 7 gram bullet. A physics student hears the claim and calls cap, saying that they may be able to match the bullet's momentum, but not energy. If the bullet is fired with a speed of 800 m/s, what speed would the baseball need to go to match the energy and momentum, respectively?
113 m/s for energy, 16 m/s for momentum
500
Object 1 of mass M and object 2 of mass 3M can slide on a track with no friction. Object 1 moves with speed v to the right, while object 2 is at rest. Right after the collision object 1 moves left at speed v/2.Perfectly Elastic? And how fast is object 2 going?
Yes, v/2 (to the right)
500
What are the five elements that make Captain Planet?
Earth, Fire, Wind, Water, Heart