Machines
How
Power
Work
Mechanical Advantage
100
What is the purpose of using machines?
make work easier.
100
How does a WEDGE make work easier?
Increase the distance force is applied and changes the direction of the applied force
100
What is the formula for power solving for Time?
Time = Work / Power
100
What is the formula for Work solving for Force?
Force = Work / Distance
100
What is Mechanical Advantage?
How much easier the machine makes the work easier.
200
(TRUE or False)
Machines help us by changing the amount of work that is required.
False
200
Johnny grabs a rope to bring water up from a well as he draws the rope downward the bucket is lifted from the bottom of the well.
How does the machine Johnny is using make his work easier?
Changes the direction of his applied force.
200
What is the Unit for Power?
Watt
or
(Joule / Second)
200
What is the unit for Work?
Joule
or
(Newton*Meter)
200
A lever has a mechanical advantage of 1 when the fulcrum is placed where?
directly in the middle of the effort and resistance.
300
A Seesaw is an example of what simple machine?
Lever
300
Which Screw would would make work the easiest?
A screw with 20 threads per inch
A screw with 10 threads per inch
the screw with 20 threads per inch
300
Calculate the Power if 320 Joules are completed in 8 seconds.
320 J / 8 sec = 40 W
300
How much work is done by Jeremy if he moves a 120 N object 30 meters to the south?
120 N * 30 m = 360 J
300
A pulley system has a mechanical advantage of 16 and is used to lift an object 800 N off the ground.
How much would the effort force need to be applied to lift the object?
16 = 800N / x
x = 50 N
400
What are the Six types of Simple machines in alphabetic order?
Inclined Plane
Lever
Pulley
Screw
Wedge
Wheel and Axle
400
What Simple machine are in use on a Wheelbarrow?
Wheel and Axle
Lever
400
If a car has 3,000 Watts of power and did 5,000 Joules of work. Over what time was the work performed?
5,000 J / 3,000 W = 1.667 sec
400
Jeremy was asked to move another box this time he did 900 Joules of work after traveling 15 meters. What was the weight of the box in Newtons?
900 J / 15 m = 60 N
400
What does it mean if a machine has a mechanical advantage of less than 1?
The machine made the work harder.
500
What are the three ways that machines make work easier?
Decrease Effort force
Increase Distance force is applied
Change the direction of applied force
500
This contraption is made of a combination of simple machines working in concert to perform a function
What is a compound machine (aka Complex machine)
500
Johan and Demarion are running to get to the field that is 100 meters who is more powerful?
Johan weighs 220 N and won the race with a time of 10 seconds
Demarion weighs 250 N and lost the race with a time of 11 seconds
Johan
= 220N * 100 meters / 10 seconds = 2200 W
Demarion
= 250N * 100 meters / 11 seconds = 2273 W
500
Jeff weighs 120 N and travels to see his girlfriend Annalise who weighs 100N if they meet by an oak tree 200 meters from Annalise's House and 150 meters from Jeff's House who did more work?
Jeff work = 120 N * 150 m = 18000 J
Annalise work = 100 N * 200 m = 20000 J
Annalise did more work and should probably rethink having Jeff as a boyfriend not because he didn't do as much work but because he didn't bring flowers.
500
How is the concept of Conservation of Work applied to the Formula of Mechanical Advantage?
What ever amount of work that is put in also comes out.