Simple Machines
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Simple MachinesSimple Machines
Machines are tools that make jobs Machines are tools that make jobs easier by:easier by:Changing the size of the forceChanging the size of the forceChanging the direction of the forceChanging the direction of the forceIncreasing the speed or distance Increasing the speed or distance
the object is movedthe object is moved
Mechanical AdvantageMechanical Advantage
MA is the number of times a machine MA is the number of times a machine multiplies the force being appliedmultiplies the force being applied
Ideal mechanical advantage (IMA) is Ideal mechanical advantage (IMA) is the number of times the applied force the number of times the applied force is multiplied under ideal conditions. is multiplied under ideal conditions. This assumes no friction!This assumes no friction!
Mechanical AdvantageMechanical Advantage
Actual mechanical advantage (AMA) Actual mechanical advantage (AMA) is the number of times the applied is the number of times the applied force is multiplied under real force is multiplied under real conditionsconditions
Calculating IMACalculating IMA
dR=rampHeight=2m
ddEE=ramp length=10m=ramp length=10m
For a ramp 10m long and 2m high:
Word ProblemsWord Problems
RTDQ – Read the darn question!RTDQ – Read the darn question!What is the question asking me to What is the question asking me to
find?find?What information do I have in the What information do I have in the
problem? Draw a picture!problem? Draw a picture!If I don’t have enough information, is If I don’t have enough information, is
it a two-step problem?it a two-step problem?