Unit 4(topics 1-3)

Question 1

Joule-

Answer 1

Unit for work

Question 2

Sprocket-

Answer 2

A gear with teeth that fit into the links of a chain.

Question 3

Lever-

Answer 3

A machine consisting of a bar that is free to rotate around a fixed point.

Question 4

Fulcrum-

Answer 4

The point of a lever that does not move.

Question 5

Winch-

Answer 5

A machine consisting of a small cylinder, a crank or handle, and a cable: for lifting and pulling.

Question 6

Driver hear-

Answer 6

A main gear that causes other gears to move.

Question 7

Kinetic energy-

Answer 7

The energy if motion.

Question 8

Work-

Answer 8

The transfer of energy through motion.

Question 9

Pulley-

Answer 9

A wheel with a grooved rim to guide a rope or chain that runs along the groove.

Question 10

Gear-

Answer 10

A rotating wheel-like device with teeth around its rim.

Question 11

Efficiency-

Answer 11

Useful work by system: Actual work supplied to system.

Question 12

Hockey stick-

Answer 12

Class 3

Question 13

Block and tackle-

Answer 13

A combination of fixed and moveable pulleys.

Question 14

Class 1 lever-

Answer 14

Lfe-fulcrum is in the middle.

Question 15

Class 2 lever-

Answer 15

Fle-load is in the middle.

Question 16

Class 3 lever-

Answer 16

Fel:effort is in the middle.

Question 17

Conversion-

Answer 17

Turning electrical power into Thermal energy-1 ex. Energy conversion.

Question 18

Driven gear-

Answer 18

Movement caused by a driving gear.

Question 19

Effort arm-

Answer 19

The distance between the fulcrum and the effort force.

Question 20

Fixed pulley-

Answer 20

A pulley supported by attachment to something that does not move.

Question 21

Gear train-

Answer 21

A group of two or more gears that are meshed together.

Question 22

Inclined plane-

Answer 22

A ramp or slope for reducing the force needed to lift something.

Question 23

Input work-

Answer 23

Work done on a machine.

Question 24

Load-

Answer 24

The weight of an object that is moved or lifted by a machine.

Question 25

Load arm-

Answer 25

The distance from the load to the fulcum.

Question 26

Mechanical advantage-

Answer 26

The load:the effort force.

Question 27

Moveable pulley-

Answer 27

A pulley attached to something moveable.

Question 28

Newton-

Answer 28

Unit for force.

Question 29

Output work-

Answer 29

The work a machine does on a load.

Question 30

Potential energy-

Answer 30

Stored energy.

Question 31

Radius-

Answer 31

The distance in a straight line from the center of a circle to the circles circumference.

Question 32

Speed-

Answer 32

The rate of motion.

Question 33

Speed ratio-

Answer 33

The relationship between the speed of rotations of a smaller gear and a larger gear.

Question 34

Transmission-

Answer 34

Energy transferred from one place to another, and no energy is changed or converted.

Question 35

Wheel and axle-

Answer 35

Two turning objects attached together at the centers. 1 object causes the other to turn.

Question 36

MA=

Answer 36

MA=LF --- EF

Question 37

Speed ratio=

Answer 37

Sp=#of driving teeth ---------------------- #of driven teeth.

Question 38

Work=

Answer 38

W=F•D

Question 39

Force=

Answer 39

F=w --- D

Question 40

Efficiency=

Answer 40

E=work done by lever on load ------------------- Work done on lever by effort force X100

Question 41

3 situations where it would be more practical to use a wheel and axle rather than a lever.

Answer 41

Steer a car, open a door/door knob, adjust volume on radio.

Question 42

How is a winch like a lever?

Answer 42

The handle is the effort arm, and the axle handle turns is the load arm.

Question 43

How can a simple machine make work easier?

Answer 43

Reducing force, change direction of effort, reduce distance.

Question 44

What do you have to do in return for a mechanical advantage that is greater than 1?

Answer 44

Effort force must act over a larger distance for a longer amount of time.

Question 45

Example of class 1-

Answer 45

Teeter totter, scissors

Question 46

Example of class 2-

Answer 46

Nutcracker, wheelbarrow.

Question 47

Example of class 3-

Answer 47

Baseball bat, arms, legs.

Question 48

Compound pulley-

Answer 48

Combination of fixed and moveable pulleys.