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WorksheetsEnergy, Power, Work
Total questions: 20
Worksheet time: 17mins
Unit of kinetic energy is the ....
Watt
Newton
Joule
Nm
Which of these are examples of mechanical energy?
Uk
Us
Ug
Uf
A spring is compressed vertically and used to fire a ball bearing straight up. What is the energy transformation at the instant the ball starts to move?
Ug to Us
Ug to Uk
Us to Ug
Us to Uk
A spring is compressed vertically and used to fire a ball bearing straight up. What is the energy transformation at the top of the arc?
Uk to Ug
Ug to Uk
Us to Ug
Us to Uk
A spring with a k value of 22.5 N/m is compressed 3.25 cm to fire a 100 g steel ball straight up. What is the velocity as it leaves?
7.31 m/s
2.70 m/s
.488 m/s
.238 m/s
A motor raises a 50.0 kg mass 8.5 m in 16.0 s. What is the velocity of the mass?
.425 m/s
6.88 m/s
1.85 m/s
.531 m/s
A motor raises a 50.0 kg mass 8.5 m in 16.0 s. What is the power for this motor?
266 W
312 W
185 W
.531 W
A 2.5 kg block is at rest on a table with signicant friction. The coefficient of friction is .38. Let g = 10 m/s/s. What is the minimum force to move the block?
65.8 N
25.0 N
9.5 N
4.25 N
A 2.5 kg block is at rest on a table with signicant friction. The coefficient of friction is .38. Let g = 10 m/s/s. If a F of 42 N is applied, what is the net F?
17 N
32.5 N
9.5 N
4.25 N
A motor with a 120 W rating is used to raise a 6.5 kg mass 17.5 m. How long does it take?
there is not enough information
10.5s
68.6 s
32.1 s
If you have the length of an incline, but you really need the height the object goes to, which of these equations will help you?
h = L sin theta
h = L cos theta
h = Fv
h = Planck's constant
In the P lab, why was your work value different than other people?
your distance was different
your mass was different
your time was different
your g was different
A grape has 5 calories. That's 20,900 J. If you do 3500 J of W to climb the flight of stairs, how many times do you need to climb it to burn off that grape?
12 flights
6 flights
3 flights
less than 1 flight
What does the law of COE say? Choose both correct answers.
energy can't be created or destroyed
energy can be converted from one form to another
energy is a constant in the universe
the more E you have, the more P you have
A baseball player hits a ball with a bat. Which of these is the best description of the motion?
the ball starts at rest. It accelerates while the bat is in contact. It leaves at a maximum v.
The ball has a negative v when it strikes the bat. The ball decelerates when it hits the bat and comes to rest.
The ball has a negative velocity. The bat accelerates the ball in the other direction as long it is in contact. The ball leaves at a different positive v.
The ball has a positive velocity. When the bat strikes it, that v increases as long as the bat is in contact.
Why can't you start a problem with Uk = Ug?
You can.
You must start with COE to make this statement
You must complicate the process to satisfy College Board
A company claims to have created a perpetual motion machine - one that loses zero energy over time. What would they have to have conquored?
air resistance
energy conversions
gravity
friction
The heavier you are, the more energy you burn climing the stairs
true
false
The faster you climbed the stairs, the more work you did.
true
false
Noah B. has a weight of 160 lbs. What is his weight in N?
72.7
345
711
871
