Bicycles, see-saws, and clocks are all examples of these
Mechanisms
This is a rigid bar that turns around a point
lever
True or false: Rotary transmission mechanisms connect three rotating elements.
False, just two
What mechanism do we use for speed reduction (uses friction to reduce speed)?
brakes
What is the definition of rigid?
not flexible, or easy to bend (stiff)
When you ride a bike, your legs are the _______ source because they provide force and motion.
input
True or false: The fulcrum is a point between the force and the resistance.
True
To increase the ______ of a rotary system, we transmit motion from a larger input element to a smaller output element.
speed
Name one type of brakes
disc, band, drum, caliper, cantilever, v-brake
What is the definition of friction?
force of an object moving past and against another object
The pedal and chain mechanisms transmit this force and motion to the back wheel which is the ________ receptor
output
The effect of the force applied is always increased, decreased, or stays the same?
increased (d>r)
This is a wheel that has a groove on the outside and rotates around an axis. If we attach ropes, we can lift or pull an object with less effort.
A pulley
Calculate the circumference (2πr) of a wheel with a diameter of 30 centimenters
(you can use your calculator)
94.2
What is the definition of stationary?
Not moving (still)
Name at least one type of transmission of motion
Linear or rotary transmission
When the forces acting on opposite ends of a lever are equal, we say the lever is in equilibrium. This is "The Law of the _______"
Lever
The relaitonship between the speeds of two wheels is inversely proportional to their sizes. This is called the ratio of WHAT?
transmission
What flexible device do we use to absorb energy when we apply force (accumulation)?
springs
What is the definition of aligned?
Together in a perfectly straight line
Some energy can be lost, due to WHAT?
friction
Torque = _________ x __________
Torque = Force x distance
The ratio of transmission follows this equation:
n1/n2 = d2/d1
If d is the diameter of the wheel, what does n stand for?
N is the speed of rotation
A winch is a cylinder that _______ around an axis
rotates
What is the definition of simultaneously?
at exactly the same time