Unit 3:Machine

Question 1

If 150 joules of work is needed to move a box 10 meters, what force was used?

Answer 1

15N

Question 2

What is the IMA of a weight?

Answer 2

2

Question 3

What is the efficiency of a machine that does 600 joules of usable work with an input of 800 joules of energy? Use sig figs

Answer 3

80

Question 4

A force is applied by a chain to a roller coaster car to carry it up the hill of the first drop of the Shockwave ride. This is an example of working being done. True or False?

Answer 4

True

Question 5

How can simple machines help us do more work easily?

Answer 5

Increasing the output speed by reducing the distance over which the input force

Increasing the output force by increasing the distance over which the input force is applied

Changing the direction of the input force

Question 6

A 5000N block is 10 m. How much was work done?

Answer 6

50,000j

Question 7

A BLANK machine is made up of two or more simple machine?

Answer 7

Compound

Question 8

What must be applied for work to be done?

Answer 8

Force

Question 9

What is the mathematical formula for efficiency?

Answer 9

Efficiency=(output force/input force) *100%

Question 10

How much work does Drax perform pushing Rocket in a cart 200m with 100N of force?

Answer 10

20,000j

Question 11

A machine may be 100% efficient?

Answer 11

No, a machine cannot be 100% in reality

Question 12

In order for work to happen, what two things must occur?

Answer 12

Force and displacement in the same direction

Question 13

What is another way to express 1 Joule?

Answer 13

1 N*m

Question 14

What does Ideal Mechanical Advantage reflect?

Answer 14

Increase or decrease in force without friction

Question 15

How is ideal Mechanical advantage calculated?

Answer 15

MA=Fo/Fi

Question 16

F=200N
d=50m
W=?

Answer 16

10,000J

Question 17

What is another name for the unit of power known as joules/sec?

Answer 17

Watt

Question 18

What is power a measure of?

Answer 18

The amount of work that can be done in a given amount of time

Question 19

The IMA pulley system is equal to…

Answer 19

The number of segments of rope supporting the object

Question 20

What is the standard unit of work?

Answer 20

Joules

Question 21

What is the ratio of input distance to the output distance called?

Answer 21

Ideal Mechanical Advantage

Question 22

What is the unit of power?

Answer 22

Watt

Question 23

What simple machine is used to hold objects together by twisting?

Answer 23

Screw

Question 24

What is the work done by a force of 10N moving an object 5 meters in the direction of the force?

Answer 24

50j

Question 25

Wheel and Axle?

Answer 25

Two connected rings or cylinders, one inside the other

Question 26

What’s the input force for wheel and axle?

Answer 26

Wheel

Question 27

Pulley?

Answer 27

A rope and grooved wheel

Question 28

Screw?

Answer 28

Incline plane wrapped around a cylinder

Question 29

Lever

Answer 29

Consisting of a bar that rotates around a fix point

Question 30

Inclined Planes?

Answer 30

A sloping surface connecting a lover elevation to a higher elevation

Question 31

Wedge?

Answer 31

Machine with two inclined planes giving it a thin end and a thick end

Question 32

Actual Mechanical Advantage?

Answer 32

Ratio of the output force to the input force

Question 33

Ideal Mechanical Advantage?

Answer 33

Ratio of the input distance to the output distance

Question 34

Mathematical Formula: Ideal Mechanical Advantage

Answer 34

Input Distance/Output Distance

Question 35

Which is greater Ideal or Actual Mechanical Advantage

Answer 35

Ideal because friction losses are not included

Question 36

Machine?

Answer 36

A device that helps do work more easily

Question 37

What do machines use?

Answer 37

Energy

Question 38

Efficieny?

Answer 38

The percent of work put into a machine by the user (input) that becomes work by the machine (output)