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Science (simple machines) > Simple Machines > Flashcards

Simple Machines Flashcards

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1
Q

What is a Mechanism?

A

A machine that requires the application of a single force to do work.
Transfer this energy as efficient as possible, control direction of force

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2
Q

Name the 6 simple machines?

A 
Lever (fulcrum)
Pulley (fixed or moveable)
Wheel and axle
Inclined plane 
Wedge 
Screw
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3
Q

What happens when a small force pushes farther away?

A

The larger force pushes closer

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4
Q

When the force is bigger the distance is…..?

A

Smaller

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5
Q

What simple machine do we use the most?

A

Wheel and axle, but we use all simple machines daily

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6
Q

Definition of a 1st class lever?

A

Has a fulcrum between the input and output forces

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7
Q

Definition of a 2nd class lever?

A

Effort (input) between fulcrum and output

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8
Q

Definition of a 3rd class lever?

A

Force in the middle

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9
Q

Definition of a pulley?

A

Can changed direction of input and output forces depending on whether the pulley is fixed or moveable
Consists of a grooved wheel with rope or cable looped around it

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10
Q

Definition of a wheel and axle?

A

Consists of a shaft or axle that is attached to a larger disk called the wheel
Eg. Tightening a screw with a screw driver

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11
Q

Definition of an inclined plane?

A

A sloping surface on which an object can move is called an inclined plane
It reduces the force needed to move an object with greater distance

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12
Q

Definition of a screw?

A

An inclined plane wrapped around a rod

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13
Q

The definition of a wedge?

A

An inclined plane that travels through the object or material the longer and narrower the wedge, the greater it’s mechanical advantage

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14
Q

Definition of a mechanism?

A

Made of two or more simple machines

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15
Q

How do you find the mechanical advantage of a lever? Ideal mechanical advantage?

A

M.A-Input\output

I.M.A- length of input arm/ length of output arm

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16
Q

M.A of a pulley (fixed, moveable)

Ima of pulley

A

I.M.A- equal to the number of support ropes

17
Q

M.A of wheel and axle

I.M.A of a wheel and axle

A

I.M.A- radius of wheel/radius of axle

Radius of axle/ radius of wheel

18
Q

I.M.A for an inclined plane?

A

I.M.A- length of ramp/ height of ramp

19
Q

I.M.A of a screw

A

The length of the three gives the ideal mechanical advantage

20
Q

I.M.A of a wedge?

A

The longer and narrower the wedge the greater it’s mechanical advantage

21
Q

What is the definition of Efficiency?

A

The efficiency of a machine measures the useful work done by the machine compared to the work needed to operate it.

22
Q

How to calculate efficiency?

A

Useful output work (j) x 100%\input work

23
Q

What type of simple machines consists of two inclined planes back to back?

A

Wedge

24
Q

What type of simple machine is used in cars, trucks and bicycles?

A

Wheel and axle

25
Q

What type of simple machine could be used to hold two prices of wood together?

A

Screw

26
Q

When two or more simple machines are put together, what is it called?

A

Compound machines

27
Q

Which item is an example of a wedge?

A

Axe blade

28
Q

Simple machines make a job easier but they do not change the total amount of:?

A

Force

29
Q

The amount a simple machines increased the effort force is referred to as:?

A

Mechanical advantage

30
Q

What type of simple machine consisting of a slanted flat slope helps make a moving object up easier but requires people to move the object a longer distance?

A

Inclined plane

31
Q

What can a simple machine change the size or direction of?

A

A force

32
Q

What type of simple machine consists of a bar and a fulcrum?

A

A lever

33
Q

What is the definition of a machine?

A

Any device that helps us do work

34
Q

Name the three ways make work easier?

A

Increasing the force that can be applied
Increasing the distance over which the force is applied
But changing the direction of the force

Science (simple machines) (1 decks)

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