Work & Power
The amount of work done if you use 100 N of force to move a book 5 meters.
What is 500 J?
What is an inclined plane?
An axe is an example of this simple machine.
What is a wedge?
The MA of a machine that uses 300 N of force and outputs 300 N of force.
What is 1?
The formula and unit for power
What is TP=W/t and the watt?
The amount of power a student has if they do 30 J of work in 60 s.
What is 0.5 Watts?
The simple machine that a seesaw is.
What is a lever?
The top of many water bottles is this type of simple machine.
What is a screw?
The mechanical advantage of a machine that uses 200 N of force and exerts 600 N of force.
What is 3?
Formula and unit for work
W=Fd and joule (J)?
What is because the car is not travelling a distance?
The simple machine you would use to raise a flag.
What is a pulley?
Stairs are an example of this type of simple machine.
What is an inclined plane?
The efficiency of a machine that exerts 800 J of work and requires 850 J of work. (to nearest whole number)
What is 94%?
Formula and unit for KE
KE=1/2mv2 and joule
The distance travelled by a worker who does 800 J of work using 400 N of force.
What is 2 meters?
The type of simple machine that is often used for cutting.
What is a wedge?
A ramp that is 5m long and 2m high has a MA of....
2.5
The mechanical advantage of a machine that uses 100 N of force and exerts 50 N of force.
What is 0.5?
Two students are lifting boxes that have the same mass the same distance. The student who does the task with more power will do the task in...
What is less time?
The power of a mover that pushes a box with 600 N of force a distance of 18 meters in 36 seconds.
What is 300 Watts?
Identify and describe the machines that make up a pair of scissors.
What are a 1st class lever (opens and closes the scissors) and wedge (used for cutting paper, etc.)?
What is a lever?
Bar that pivots on fixed point called fulcrum
The efficiency of a compound machine that has two simple machines: one that exerts 100 J of work and requires 120 J of work and one that exerts 250 J of work and requires 275 J of work. (round ALL to nearest whole number)
What is 76%? (83% and 91% ... so 0.83 x 0.91)
How do machines make work easier if the same amount of work still has to be done? Why are they never perfectly efficient?
Decreasing force by increasing distance.....
Friction