Unit 4 Topic 1-3 Review

Question 1

Lever

Answer 1

a machine consisting of a bar that is free to rotate around a fixed point, changing the amount of force that must be exerted to move an object

Question 2

Fulcrum

Answer 2

the point of a lever that does not move

Question 3

Effort force

Answer 3

the force supplied to any machine to produce an action

Question 4

Load

Answer 4

the weight of an object that is moved or lifted by a machine, or the resistance to movement that a machine must overcome

Question 5

Effort arm

Answer 5

in a lever, the distance between the fulcrum and the effort

force

Question 6

Class 1 level

Answer 6

a lever in which the fulcrum is between the effort and

the load

Question 7

Class 2 level

Answer 7

a lever in which the load is between the fulcrum and the effort

Question 8

Class 3 level

Answer 8

a lever in which the effort is applied between the fulcrum and the load

Question 9

Inclined plane

Answer 9

a ramp or slope or reducing the force needed to lift something

Question 10

Work

Answer 10

the transfer of energy through motion

Question 11

Joules

Answer 11

a unit used to measure energy or work; 1 J = a force of 1 N moving through 1 m

Question 12

Work input

Answer 12

Work input is work done on a machine to get the desired output. Work output is the amount of desired work that is done by a machine

Question 13

Work output

Answer 13

In physics, work output is the work done by a simple machine, compound machine, or any type of engine model.

Question 14

Mechanical advantage

Answer 14

the ratio of the force produced by a machine or system (the load) to the force applied to the machine or system

Question 15

Speed

Answer 15

the rate of motion, or the rate at which an object changes its position

Question 16

Ergonomics

Answer 16

the science of designing a home or work environment that best suits the human body in its various dimensions

Question 17

Carpal tunnel

Answer 17

The carpal tunnel is a narrow passageway surrounded by bones and ligaments on the palm side of the hand.

Question 18

syndrome

Answer 18

a group of signs and symptoms that occur together and characterize a particular abnormality or condition

Question 19

Winch

Answer 19

a machine consisting of a small cylinder, a crank or handle, and a cable; used for lifting and pulling

Question 20

Radius

Answer 20

the distance in a straight line from the center of a circle to the circle’s circumference (outer boundary)

Question 21

Wheel and Axel

Answer 21

a machine consisting of two turning objects attached to each other at their centers. One object causes the other to turn

Question 22

Gear

Answer 22

a rotating wheel-like device with teeth around its rim

Question 23

Gear train

Answer 23

a group of two or more gears that are meshed together

Question 24

Driving gear( driver)

Answer 24

the main gear that causes other gears to move; also called the driver

Question 25

Driven gear( follower)

Answer 25

a gear whose movement is caused by a driving gear;

also called follower

Question 26

Sprocket

Answer 26

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

Question 27

Speed ratio

Answer 27

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

Question 28

Pulley

Answer 28

a wheel with a grooved rim to guide a rope or chain that runs along the groove; used to transmit or change the direction of force

Question 29

Fixed Pulley

Answer 29

a pulley supported by an attachment to something that does not move, such as a ceiling, wall, or tree

Question 30

Moveable Bulley

Answer 30

A movable pulley is a pulley that is free to move up and down and is attached to a ceiling or other object by two lengths of the same rope.

Question 31

Block and tackle

Answer 31

a combination of fixed and movable pulleys; may be used to lift very heavy or awkward loads

Question 32

Compound Pulley

Answer 32

a combination of several pulleys working together

Question 33

Potential energy

Answer 33

stored energy

Question 34

Kinetic energy

Answer 34

Kinetic energy is a form of energy that an object or a particle has by reason of its motion.

Question 35

Transmission

Answer 35

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

Question 36

Efficiency

Answer 36

the ratio of the useful work or energy provided by a

machine or system with the actual work or energy supplied to the machine or system