Gr.8 Simple Machines

Question 0

define force

Answer 0

any push or pull

Question 1

define work

Answer 1

work- the result when a force moves an object a certain distance

Question 2

define energy

Answer 2

energy- the ability to apply a force to move an object a distance

Question 3

define efficiency

Answer 3

efficiency- being able to do something with the least waste of time and effort

Question 4

explain the differences between clas 1,2 and 3 levers

Answer 4

class 1- the fulcrum is in between the load force and the input force
class 2- the load force is in between the fulcrum and the input force
class 3- the input force is in between the load force and the fulcrum

Question 5

what is load force?

Answer 5

Load force- the force that the input force has to overcome in order to cause movement

Question 6

what is the fulcrum?

Answer 6

fulcrum- the pivot point of a lever

Question 7

what is the input force?

Answer 7

Input force- the effort force applied to the lever

Question 8

what is the lever?

Answer 8

The Lever- a rigid bar that pivots at a point called the fulcrum.
Ex. Crow bar

Question 9

what is a gear?

Answer 9

Gears- toothed wheels used to speed up or slow down motion.

Ex. Drive gear

Question 10

what is a pulley?

Answer 10

The pulley- a wheel with a grooved rim around which a cord passes.
Ex. Well

Question 11

what is a wheel and axle?

Answer 11

The wheel and axle- a large diameter disk attached to a small diameter shaft.
Ex. steering wheel

Question 12

what is a screw?

Answer 12

The Screw- an incline plane that has been cut into a central core.
Ex. spiral staircase

Question 13

what is the wedge?

Answer 13

The Wedge- a modified incline plane tht can be moved back and forth with ease.
Ex. doorstopper

Question 14

what is an incline plane?

Answer 14

The Inclined Plane- is a tilted, flat surface.

Ex. wheelchair ramp

Question 15

define simple machine

Answer 15

Simple machine- a device that requires a single force to work; made of only one or two parts

Question 16

define input

Answer 16

Input- the force, energy, or raw materials that you put into a system

Question 17

define output

Answer 17

Output- the task or service that a system performs

Question 18

what are side effects?

Answer 18

Side Effects- the unintended or undesired outputs of a system

Question 19

what is a system?

Answer 19

a group of parts that work together to perform a desired task

Question 20

name 2 types of systems

Answer 20

physical & social

Question 21

what are 3 examples of physical systems?

Answer 21

mechanical
optical
electrical

Question 22

what are 3 types of social systems?

Answer 22

bee colonies, and a wolf or coyote pack