CH 2 Main Test

Question 1

What Unit do we use to Measure Weight? & Force is applied by?

Answer 1

To Measure Weight and apply force we use Newtons (N)

Question 2

What is the Force “Newton” named after?

Answer 2

The Force Newton is named after Sir Isaac Newton; an english physicist who developed many of our current ideas about Force and Motion

Question 3

What Does the Head of the Arrow indicate?

Answer 3

The head of the arrow indicates direction

Question 4

What does 1 Joule equal

Answer 4

1 Joule equals 1 Newton-metre (N-M)

Question 5

What does 1 Newton-metre equal?

Answer 5

1 Newton-metre equals 1 Joule (J)

Question 6

What does the Length\Thickness of the
Arrow Indicate?

Answer 6

the length or thickness of the arrow indicates the magnitude.

Question 7

What is the Formula for MA (Distance)

Answer 7

MA= Input Distance
——————
Output Distance

Question 8

What is the formula for MA (Length)

Answer 8

MA= Effort Arm Length
————————
Load Arm Length

Question 9

What are 2 common lubricants?

Answer 9

Ski wax and engine oil are two common lubricants.

Question 10

What is Energy often defined as?

Answer 10

Energy is often defined as the ability to do work.

Question 11

What is the Formula for Work?

Answer 11

W= FxD

Question 12

What is the formula for Actual MA

Answer 12

Actual MA= Measured Output Force
———————————
Measured Input Force

Question 13

One thousand Joules (J) is equal to how many kilojoules (KJ)?

Answer 13

One thousand joules (J) is equal to one kilojoule (KJ)

(1000 J= 1 KJ).

Question 14

One Kilojoule (kj) is equal to how many joules (J) ?

Answer 14

One kilojoule (kj) is equal to one thousand joules (J)

(1 kJ = 1000 J).

Question 15

When is Work done?

Answer 15

Work is done only when a force applied to an object causes the object to move a distance parallel to the force.

Question 16

How can energy be consumed when no work is done?

Answer 16

you use energy to apply forces on things to make them move. not all of the energy consumed is turned into useful work. Energy was consumed applying the force even when there was no work done.

Ex: When you tried to move the rock, you consumed energy, but the rock did not move. Energy was used as your muscles contracted while pushing on the rock. Your heart pumped more blood and your chest muscles moved air in and out of your lungs as you applied more force. In other words, work was done on your internal organs, but not on the rock.

Question 17

W= F x _ How do you find Distance?

Answer 17

D= W
—
F

Question 18

W= _ x D How do you find Force?

Answer 18

F= W
—
D

Question 19

What is the units used for work?

Answer 19

Newtons (N), Joules (J)

Question 20

What is the 6 Simple Machines?

Answer 20

wedge, screw, lever, pulley, inclined plane and the wheel and axle.