Work and Power
Energy Transformations
KE and PE
Simple Machines
100
When a force acts on an object to cause displacement
Work
100
Sunlight is used to create sugars and starches, which are stored in plants. This is _______ energy transformed to ______ energy.
Light or radiant energy to chemical energy
100
As Kinetic energy increases, potential energy____
Decreases
100
Which class of levers is shown
Third Class
200
The rate of doing work or the rate of energy transfer
Power
200
A battery powers a flashlight. This is ____ energy transferred to ___ energy
Chemical energy to Light energy
200
____ is the energy of motion
Kinetic energy
200
An inclined plane is 6 meters long and 2 meters high. What is the mechanical advantage of the inclined plane?
6/2=3
300
A machine does 600 Joules of work in 10 seconds. What is the power? (Power is in Watts)
600 / 10 = 60 W
300
Your television (which is plugged in) produces voices, sirens, music, etc. This is ____ energy transferred to _____ energy.
Electric energy to sound energy
300
What is the kinetic energy of Michael's F150 truck if he drives with a velocity of 27 m/s? The mass of the truck is 2700 kg
KE = 1/2 (2700) x 272
KE = 984,150 J
300
Mufasa uses 5 Newtons of force to move a 20N load in his wheelbarrow. What is the mechanical advantage?
output force/input force
20/5 = 4
400
A box is pushed with a force of 50 N for 3 meters. How much work is accomplished?
50 x 3 = 150 J
400
In archery, you pull back on the bow string and then release the arrow. This is ____ energy tranferred to _____ energy
Elastic energy to mechanical or motion energy
400
A book weighs 9 N and sits on a bookshelf 2 meters high. What is the gravitational potential energy of the book?
9 x 2 = 18J
400
What class of lever is pictured?
Second Class
500
A person uses 40 Watts of power to lift a box in 5 seconds. How much work did he do?
P = W/t; so P x T = W
40 x 5 = 200 J
500
You burn wood to create heat. This is ____ energy transferred to ____ energy
Chemical energy to thermal energy
500
A 2 Kg coconut that is 25 meters from the ground has how much potential energy?
2 x 9.8 x 25 = 490 J
500
What is this pulley's mechanical advantage?
4