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Flashcards unit 1.1 MACHINES

Opal Khan Inglés 5,0Valoración media 5,0 de 5 (2 valoraciones) 20 fichas

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1What is an effort?An effort is force applied to a lever to overcome the load.
2What is the load?The load is a force that a lever is used to overcome.
3What is a simple machine?A simple machine is a device that makes work easier by changing the size or direction of a force.
4What are the three different ways a simple machine can make a task easier?It can:
-Change the size of a force
-Make things speed up
-Change the direction of a force
5What is a force multiplier?A force multiplier is a machine that increases the force applied for a task, such as a first-class lever.
6What are speed multipliers?Speed multipliers are machines that requires a small movement of an effort to produce a large movement of a load, such as a third-class lever.
7What is a lever?A lever is a simple machine consisting of a rigid rod that pivots about a point.
8What is fulcrum?Fulcrum is a point about which a lever pivots.
9The way a lever operates, depends on what?The way a lever operates depends upon the position of the effort, load and fulcrum.
10Levers can be grouped into what three types or classes of levers?-First-class levers
-Second-class levers
-Third-class levers
11What is a first-class lever?A first-class lever is a lever with effort and loads located at each end, and fulcrum in the centre.
12What are some examples of first-class levers?Some examples of first-class levers are:
-Pliers
-Tin snips
-Hedge cutters
-Scissors
13What is a second class lever?A second class lever is a lever with the fulcrum located at one end, the effort at the other and load in the centre.
14What are some examples of second-class levers?Some examples of second-class levers are:
-Bottle openers
-Paper guillotines
-Nutcrackers
15What is a third-class lever?A third-class lever is a lever with the fulcrum located at one end, with the load at the other and effort in the centre.
16What are some examples of a third-class lever?Some examples of a third-class lever are:
-Tweezers
-Tongs
-Brooms
17What is the mechanical advantage?The mechanical advantage is the ratio of a load force to the effort force used by a machine.
18What are some examples of speed multipliers?Some examples of speed multipliers are baseball bats, cricket bats and golf clubs.
19Where is the fulcrum positioned in a second-class lever?A second-class lever has its fulcrum positioned at one end of the system and the effort at the other.
20Where is the fulcrum positioned in a first-class lever?A first-class lever has its fulcrum positioned between the effort and the load.