Mechanism Basics
Linear Transmission of Motion
Rotary Transmission
More on motion!
English Definitions
100

Bicycles, see-saws, and clocks are all examples of these

Mechanisms

100

This is a rigid bar that turns around a point

lever

100

True or false: Rotary transmission mechanisms connect three rotating elements.

False, just two

100

What mechanism do we use for speed reduction (uses friction to reduce speed)?

brakes

100

What is the definition of rigid?

not flexible, or easy to bend (stiff)

200

When you ride a bike, your legs are the _______ source because they provide force and motion.

input

200

True or false: The fulcrum is a point between the force and the resistance.

True

200

To increase the ______ of a rotary system, we transmit motion from a larger input element to a smaller output element.

speed

200

Name one type of brakes

disc, band, drum, caliper, cantilever, v-brake

200

What is the definition of friction?

force of an object moving past and against another object

300

The pedal and chain mechanisms transmit this force and motion to the back wheel which is the ________ receptor

output

300

The effect of the force applied is always increased, decreased, or stays the same?

increased (d>r)

300

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

300

Calculate the circumference (2πr) of a wheel with a diameter of 30 centimenters

(you can use your calculator)

94.2

300

What is the definition of stationary?

Not moving (still)

400

Name at least one type of transmission of motion

Linear or rotary transmission

400

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

400

The relaitonship between the speeds of two wheels is inversely proportional to their sizes. This is called the ratio of WHAT?

transmission

400

What flexible device do we use to absorb energy when we apply force (accumulation)?

springs

400

What is the definition of aligned?

Together in a perfectly straight line

500

Some energy can be lost, due to WHAT?

friction

500

Torque =  _________ x __________

Torque = Force x distance

500

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

500

A winch is a cylinder that _______ around an axis

rotates

500

What is the definition of simultaneously?

at exactly the same time

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