Work
How is work calculated?
W = F ⋅ d
What is a simple machine?
A basic mechanical device that makes work easier
How do you calculate power?
P = W/t
What is the formula for Potential Energy?
mgh
What is a renewable resource?
A renewable resource is a resource that can be replased naturally over the time.
What is the unit of Work?
Joule
What type of simple machine is a doorstop?
A wedge
What is the unit of power?
Watts
What is the formula of ME?
KE + PE
Coal,Oil, Natural gas are nonrenewable resources? True or false?
True
What is the meaning of W = F ⋅ d?
Force and distance
What type of simple machine are scissors?
Lever
What is P = W t?
The formula for power in watts is given by the work and the time.
What is the formula of KE?
KE=1/2mv2
Can solar energy be replaced?
No, the sun will keep shining for billions of years, so solar energy is renewable.
A person is playing soccer with a force of 567 N over a distance of 24 meters. How much work is done on the soccer ball?
13608 J
How many types of simple machines are there?
There are six types of simple machines
A lamp uses 300 J of energy in 100 seconds, what is the power?
P= 3 W
A 2 kg object is placed on a table 1 meter high. What is its gravitational potential energy?
PE= 19.6 J
Why is water a renewable resource?
Water keeps moving through the water cycle.
A person pushes a box with a force of 1035 N over a distance of 50 meters in a straight line. How much work is done on the box?
51750 J
What are the types of simple machines?
Wheel and axle, pulley, inclined plane, screw, wedge and lever.
A lamp uses 6000J of energy in 2500 seconds, what is the power?
P=2.4 W
A car with a mass of 1,500 kg is moving with a velocity of 20 m/s. What is the kinetic energy of the car?
KE= 300,000 J
Why is wind energy good for the environment?
Wind energy doesn’t pollute the air because it doesn’t use fuel.