Save
or

or

taken

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

focusNode
Didn't know it?
click below

Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size     Small Size show me how

# Chapter 4, 5, 6

### Revise Forces, Moments, Centre of gravity, Levers and Pressure

What is the difference between mass and weight? Mass is the mount of matter in an object, weight is mass due to gravity.
What is the unit of weight? Kilogram, Kg.
How do you calculate a person’s weight? Using a mass balance.
Why do people have different weights on the moon and in outer space? There is less gravity in those places.
What is the formula for a moment of a force? Moment of force = distance from center Multiplied by force applied. M=RxF
What is a lever? A lever is a beam or rigid rod pivoted at a fixed hinge, or fulcrum
Define the law of the lever. If the distance from the fulcrum to where the input force is applied is greater than the distance from fulcrum to where the output force is applied, then the lever amplifies the input force
What is the center of gravity? The point at which all the mass in an object can balance on a single point.
What is stable, neutral and unstable equilibrium? Stable: Where the center of gravity is below the resting point. Neutral: Where the center of gravity and restig point are the same height. Unstable: Where the center of gravity is above the resting point.
What is pressure? Force per unit area.
What units is pressure measured in? Newtons per Meter square. N/m2
What is the relationship between pressure, force and area? Give the formula for this relationship. Force, pressure and area all change each others outcome. Force = Pressure x Area.
How does pressure vary with depth in liquids? It increases.
What is atmospheric pressure? It is the pressure of the air pressing against us at sea level.
How does atmospheric pressure vary with height? It decreases.
Where is pressure greatest – at the top of a mountain or at sea level? Sea level.
How can you measure pressure? Using a barometer.
What is an isobar? An Isobar is a line of equal or constant pressure on a graph, plot, or map.
When the pressure is high what will our weather be like? Clear and sunny.
When the pressure is low what will our weather be like? Windy and raining.
When the isobars are very close together on a weather chart what does this mean for the weather? It should be clear and sunny.
Created by: SC Dave

Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

• SPACEBAR - flip the current card
• LEFT ARROW - move card to the Don't know pile
• RIGHT ARROW - move card to Know pile
• BACKSPACE - undo the previous action

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
 "Know" box contains: Time elapsed: Retries:
restart all cards