Levers
What are the three parts to a lever
Load, Effort, Fulcrum
When is Work being done? (What is it)
Work is being done when a force is used to move something.
What is kinetic energy?
The energy of an object in motion.
How does the pulley work in a fixed pulley?
The pulley is fixed to a spot and does not move while being used.
Will a screw with threads far apart be easier to use than a screw with threads closer together? WHY?
No, a screw with threads closer together requires less effort because it has a gentler slope.
Draw and Label a CLASS ONE Lever
Load, Fulcrum, Effort
Effort Fulcrum Load
In order for work to be done, there needs to be what two things?
Force and Distance
What is potential energy?
Stored energy that has the potential to move.
How does the pulley work in a moveable pulley?
The pulley moves with the load.
Two wedges are placed next to each other. Wedge 1 is longer and Wedge 2 is shorter. Which Wedge requires the least amount of effort? WHY?
Wedge 1 because it is longer so it has to travel a smaller distance.
Draw and Label a CLASS TWO Lever
Fulcrum Load Effort
Effort Load Fulcrum
In order for it to be Work, the force and distance need to be doing what?
Going in the same direction.
Where does a roller coaster cart have the most potential energy and the most kinetic energy?
Most potential energy = the very top of the hill
Most kinetic energy = the bottom of the hill
Which way does the Load and Effort travel in a fixed pulley and is there a change in the direction of force? WHY?
Load = up and Effort = down
Yes because the load and effort travel in different directions.
Inclined plane 1 has a slope of 60 degrees and Inclined plane 2 has a slope of 30 degrees. Which Inclined plane with require the least amount of effort to lift a load? WHY?
Incline Plane 2 because it is not as steep.
Draw and Label a CLASS THREE Lever
Fulcrum Effort Load
Load Effort Fulcrum
An object was moved 8 meters with a force of 5 N. How much work was done? Work= Force x Distance
Work = 40 J
Two objects of the same mass are placed a certain distance off the ground. One object is 15 cm off the ground and the other object is 5 cm off the ground. Which object will have the most potential energy? WHY?
The object 15 cm off the ground will because it has more height than the other object.
Which way does the Load and Effort travel in a movable pulley and is there a change in the direction of force? WHY?
Load = up and Effort = up
There is no change in the direction of force because the load and effort travel the same direction.
Fill in the blanks: When a wheel and axle is turned the wheel travels a ____________ distance with much less _________, while the axle travels a __________ distance.
longer
force
shorter
Where should the load and effort be placed in relation to the fulcrum to make it have the LEAST AMOUNT of effort required?
Load closes to the fulcrum and Effort furthest away
When I pick up a chair and walk forward with the chair, is work being done? WHY?
No because the force and distance do not travel in the same direction.
Two cars of the same mass are traveling down the road. One is traveling 30 mph and the other is traveling 40 mph. Which one is going to have the greater amount of kinetic energy? WHY?
The car traveling 40 mph will have the most kinetic energy because it has a higher speed.
Does a fixed pulley or a movable pulley have a change in the amount of force needed? WHY?
Movable Pulley because the load and effort are not equal. The effort is half of the load.
How can you decrease the amount of effort needed to push a load to the top of an inclined plane?
Increase the length of the ramp to make it less steep.