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The Lever 5-2
Terms in this set (17)
a device that makes doing work easier. They work easier by increasing the force that can be applied to an object and/or changing the direction of an applied force. A DEVICE THAT IS CAPABLE OF DOING WORK EASILY BY: 1. REDUCING THE AMOUNT OF EFFORT FORCE 2. INCREASED EFFORT DISTANCE 3. CHANGING DIRECTION OF EFFORT FORCE 4. INCREASES THE SPEED OF MOVING THE LOAD
a machine that does work with only one movement of the machine. 6 types: lever, pulley, wheel and axle, inclined plane, screw, and wedge.
Two or more simple machines that operate together form this. EX. CRANE, NAIL CLIPPER
is a bar that is free to pivot or turn around a fixed point (fulcrum). 3 classes of this
A SIMPLE MACHINE CONSISTING OF A ROD OR A SIMILAR OBJECT THAT ROTATES AROUND A FULCRUM/PIVOT POINT. IT CHANGES THE DIRECTION AND OR THE ANOUNT OF FORCE NEEDED TO DO WORK.
Fulcrum/ Pivot Point
A fixed point AT WHICH A LEVER ROTATES.
Force put in by you. AKA input force and applied force. Fe THE FORCE EXERTED BY A PERSON OR A MOTOR TO A MACHINE WHILE LIFTING A LOAD.
Distance the machine moves because of Effort Force. de THE DISTANCE ON WHICH THE EFFORT FORCE ACTS ON A SIMPLE MACHINE.
AKA resistance distance. dr- How much the machine moves because of load force and also how much the object moves. THE DISTANCE A LOAD IS ABLE TO MOVE WHEN ACTED ON BY A LOAD FORCE.
AKA Output Force RESISTANCE FORCE . Fr - Force put in by machine TO OVERCOME RESISTANCE FROM GRAVITY AND FRICTION WHEN LIFTING A LOAD.
- WHEN LIFTING AN OBJECT STRAIGHT UP LOAD FORCE = WEIGHT OF OBJECT
Length of effort arm
AKA Input Arm. Le o Lea - Distance between the fulcrum and the effort force.
Length of resistance arm
AKA Output Arm. Lr or Lra. Distance between the fulcrum and resistance force/ LOAD FORCE.
the fulcrum is located between the input and output forces. The output force is always in the opposite direction of the input force in this. ex. screwdriver used to open a can.A LEVER IN WHICH THE FULCRUM IS BETWEEN THE EFFORT FORCE AND LOAD FORCE. EXS. SEE SAW, SCISSORS
In this the output force is located between the input force and the fulcrum. The output force is exerted between the input force and the fulcrum. For this the output force is always greater than the input force.
A LEVER IN WHICH THE LOAD IS BETWEEN THE EFFORT FORCE AND THE FULCRUM.
ex.baseball bat In this, the input force is applied between the output force and the fulcrum. The output force is always less than the input force in this. Instead, the distance over which the output force is applied is increased.
A LEVER IN WHICH THE EFFORT FORCE IS BETWEEN THE LOAD AND THE FULCRUM.
EXS. TWEEZERS, FISHING POLE
The force that is applied to the machine.AKA INPUT WORK. THE WORK DONE BY THE EFFORT FORCE IN A SIMPLE MACHINE. INPUT FORCE= EFFORT FORCE X EFFORT DISTANCE.
The force applied by the machine. ALSO CALLED OUTPUT WORK
OUTPUT WORK= LOAD FORCE * LOAD DISTANCE
Law of conservation of energy
Energy can not be created or destroyed BUT IT CAN CHANGE FROM ONE FORM TO THE OTHER Because of this the amount of energy the machine transfers to the object can not be greater than the amount of energy that you transfer to the machine. When energy is transferred some energy changes to heat due to friction SO WORK OUTPUT IS ALWAYS SMALLER.
Recommended textbook explanations
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Principles of Physics (International Edition)
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