A force is a ___ or ___
push or pull
A force can do 4 things...
make an object move, slow down an object, stop an object from moving, and change the direction of the object
Force is measure in:
Force is measured with:
Amount of grams in every one Newton
What 2 conditions must be met in order for work to be done
something has to move and the motion has to be in the direction of the applied force
Is work being done when you carry an object a distance? Why?
No, the object isn't moving, you are!!!!!!
The formula for finding work is:
w = f x d
The unit we use to measure work is:
Newton-meters (N-m) OR Joules (J)
The formula for finding power us:
P = w divided by t OR P= f x d divided by t
The unit we use to measure power is:
How much power is used when a person pushes an object with 100N of force a distance of 10m in 5 seconds?
What device makes work easier?
machines can be classified as either ___ or ___ machines
simple or compound
The 6 simple machines are:
The Lever, The Pulley, The Wheel and Axle, The Inclined Plane, The Wedge, and The Screw
The 3 smiple machines that are forms of an inclined plane are:
The Wedge, The Screw, and The Inclined Plane
The 3 simple machines that are forms of a lever are:
The Lever, The Pulley, and The Wheel and Axle
A Lever is made up of what 4 parts?
Resistance (Force and Arm), Effort (Force and Arm), Fulcrum, and a Plank/Bar
The 2 arms of a lever are:
effort and resistance
The mechanical advantage of a lever that has an effort arm and resistance arm of 10 cm is:
The 3 types of lever classes are:
1st class, 2nd class, and 3rd class
the fulcrum, effort, and resistance are in what order in a 2nd class lever?
fulcrum, resistance, effort
Is the fulcrum, effort, of resistance in the middle for a 3rd class lever?
The # of times a machine multiples the effort force is called:
mechanical advantage (MA)
A machine with a MA of 5 mulitplies the effort force _____ times?
The formula for finding the MA of any simple machine is:
MA = RF divided by EF
The MA of a machine that moves 800 kg resistance with a 200 kg effort force is:
The weight a resistance that is lifted on a machine with 10 kg of effort force and a mechanical advantage of 4 is ___ kg
What are the 2 ways to find the MA of a lever?
MA = EA divided by RA or MA = RF divided by EF
What are the 2 ways to find the MA of a wheel and axle?
MA = Wheel Diameter divided by Axle Diameter OR MA = RF divided by EF
What are the 2 ways to find the MA of a pulley?
MA = RF divided by EF or fixed=1, moveable=2, and block and tackle=3 or more
What are the 2 ways to find the MA of an inclined plane?
MA = l divided by h OR MA = RF divided by EF
What are the 2 ways to find the MA of a wedge?
MA = RF divided by EF or MA = l divided by w
A force that acts in a direction opposite to the motion of the moving object us called:
Do you need to exert a LARGER or SMALLER force than the force of friction in oreder to move an object?
when solid objects slide over each other _____ friciton results
when solid objects roll over each other _____ friction results
The force exerted by a fluid is called _____ friction
3 examples of fluids are:
water, oil, and air
slippery substances that reduce friction are called:
A ____ is a wheel with teeth
The gear recieving that force is called the _____ gear
The gear transmitting the force is called the _____ gear
Gear Ratios are caluculated by...
finding the LCM of the 2 gears based on the # of teeth they have, and dividing the LCM by the # of teeth they each have
Which gear is always listed first in a gear ratio? (driving or driven)
The 3 types of pulley's are:
fixed, moveable, and block and tackle
These pulleys change the direction of the applied force:
fixed and block and tackle
This pulleys cannot change the direction of the applied force:
What is the 1 major difference between a wedge and an inclined plane?
A wedge moves and an inclined plane doesn't
A wedge can ____, ____, and ____
split, fasten, and cut
The formula for IMA is:
Length divided by Height
The difference between IMA and AMA is _____ is not taken into account
What does IMA stand for?
Ideal Mechanical Advantage
What does AMA stand for?
Actual Mechanical Advantage
THe formula for AMA is:
RF divided by EF
2 things a screw can do are ____ and ____
fasten and raise
A force can be exerted on an object without work being done because...
force is exerted through distance
This type of inclined plane gives a greater MA:
short in height and long in length