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Science - Year Nine > Forces > Flashcards

Flashcards in Forces Deck (30)
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1
Q

What can the equation of force be written as?

A

F
P= _ = Newtons/metre2 or Pascals
A

2
Q

Show the pressure triangle

A

/ \
/ F \
/— \
/P x A\

3
Q

What is biomass?

A

Any mass that comes from a living thing

4
Q

How do you test for oxygen?

A

A glowing wooden splint relights in a test tube of oxygen

5
Q

How do you test for carbon dioxide?

A

A lit wooden splint goes out in a test tube of oxygen

Bubble gas through a limewater {calcium hydroxide solution} If it’s carbon dioxide the limewater will turn cloudy white

6
Q

How do you test for starch?

A

Starch turns red to black when tested with Iodene solution

7
Q

What is a hydraulic system?

A

In a hydraulic system you transmit a force from one point to another via an incompressible liquid

8
Q

What can we do using a hydraulic system?

A

Using a hydraulic system you can increase a force applied to a particularly area

9
Q

What happens when gases are compressed?

A

When gases are compressed the particles bump against each other and so the pressure rises

10
Q

Where does pressure come from?

A

Pressure comes from particles bumping against other particles. Air pressure comes from gas particles bumping against things like trees or buildings, even people

11
Q

If you’re higher up in the atmosphere what happens to the air pressure and why?

A

The higher up in the atmosphere the lower the air pressure because there isn’t anything for the gas particles to bounce off to create air pressure

12
Q

What is a lever and what does it do?

A

A lever is a rigid bar resting on a pivot used to move a heavy or firmly fixed load with one end when pressure is applied to the other

13
Q

Give four examples of a lever

A
Scissors
Doors
Light switches
Windows
Wheel barrow
Cranes
14
Q

What is a turning force?

A

A turning force is described as a force multiplied by the distance the force is away from the point of turning {pivot} it must be at right angles

15
Q

What is the proper name for the turning point

A

The pivot

16
Q

How do you work out the turning force?

A

Turning force = Force X Distance

17
Q

How can forces move objects?

A

Forces can move objects by turning them around a pivot

18
Q

What is a long bar that pivots called?

A

A lever

19
Q

When you push down on one side of a lever what are you doing and what will happen to the object on the other end? {the load}

A

When you push down on one side you are applying force. The object on the other end {the load} moves up.

20
Q

What does using s lever do?

A

Using a lever magnifies the force making objects easier to use

21
Q

What is the turning force measured in?

A

The turning force is measured in Nm {newtons/meter}

22
Q

What is the equilibrium?

A

Equilibrium is where the overall moment is 0

23
Q

What is the moment?

A

The turning effect of a force is known as the moment

24
Q

If the total anti-clockwise moment is equal to the total clockwise movement then what is the turning force?

A

If the total anti-clockwise moment is equal to the total clockwise movement then the turning force is balanced

25
Q

What is pressure?

A

Pressure is the force over a specific area.

26
Q

What unit is used to measure pressure?

A

Newtons per square meter

27
Q

A force of 10N acts upon an area of 2m squared. What would the pressure be?

A

5 N/m squared

28
Q

Can liquids be compressed?

A

Liquids cannot be compressed

29
Q

Can gases be compressed?

A

Gases can be compressed.

30
Q

If more gas particles are added to a container, is the pressure increased or decreased?

A

The pressure is increased if more gas particles are added to a container