Work
What is the formula for work?
Work = Force x Distance
W = F x D
The rate of doing work
What type of simple machine can be used to prop open a door?
Wedge
Define energy
The ability to do work
What is the SI unit for work?
Joule
What is the SI Unit for Power?
Watt (W)
What simple machine can be found on the bottom of a shopping cart that makes movement easier?
Wheel and axle
What are 2 forms of energy?
Work is the product of force and distance
What is the formula for power?
Power = work/time
P= w/t
What type of simple machine can be used to make going uphill easier?
Inclined plane
The energy of motion is...
Kinetic Energy
Fill in the blank:
if all of the force acts in the ________ direction as the motion, all of the force does work.
SAME
746 watts
What type of simple machine helps keep the lid on your water bottle?
Screw
Potential energy
Solve this problem:
Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.
1800 J
Solve this problem:
Ian and Steve ski down the 75 m slope in 80 seconds using 400 N of penguin force. Calculate their penguin power!
375 W
What type of simple machine is used in a teeter totter?
Lever
What are the two types of potential energy
Elastic and Gravitational