3.3 Pressure in gasses

Unit 3;

Recap of 3.1 & 3.2

Complete these questions to test your understanding of lessons 3.1 & 3.2 from yesterday.

Multiple Choice

On a distance VS time graph, the distance is always plotted on the

• x-axis

• y-axis

• z-axis

• can be on any of them

Multiple Choice

On a distance VS time graph, the time is always plotted on the;

• x-axis

• y-axis

• z-axis

• can be any of them

Multiple Choice

On a distance VS time graph, the slope of the line gives helps you find the ____

• distance

• time

• speed

• acceleration

Multiple Choice

This distance VS time graph show's an object that is ____ ____

• Moving Fast

• Moving Slow

Multiple Choice

This distance VS time graph show's an object that is ____ ____

• Moving at a Fast speed

• Moving at a Slow speed

• Moving at a Medium speed

Multiple Choice

This distance VS time graph show's an object that is ____ ____

• Moving Fast

• Moving Slow

Multiple Choice

This distance VS time graph show's an object that is ____ ____

• Speeding Up

• Slowing Down

Multiple Choice

This distance VS time graph show's an object that is ____ ____

• Speeding Up

• Slowing Down

Multiple Choice

How far will Barkus go in 9 seconds?

• 9 meters

• 1 meter

• 6 meters

• 10 meters

Multiple Choice

What is the formula to calculate speed?

• S = t/d

• S = d/t

• S = d x t

• S = t x d

Multiple Choice

A runner races in the 100 meter dash. It takes her 10 seconds to finish. What is her average speed?

• 10 m/s

• 1000 m/s

• 100 seconds

• 10 seconds

Multiple Choice

Which of the following is the standard unit of distance ?

• miles

• meters

• kilometers

• m/s

Multiple Choice

Which of the following is the standard unit of time?

• seconds

• minutes

• hours

• years

Multiple Choice

Which of the following is THE STANDARD unit of speed ?

• miles/seconds

• miles/hour

• m/s

• kilometers/hour

Multiple Choice

Reese rides her bike 10 miles in 5 hours.
Avery rides her bike 15 miles in 5 hours. Which girl rides her bike faster?

• Reese

• Avery 

Multiple Choice

If you are solving for the distance, you would calculate the...

• time divided by speed

• speed divided by time

• speed multiplied by time

• distance multiplied by speed

Multiple Choice

Based on the UNITS given, which of the following would be a correct answer for finding the SPEED.

• S = 4 miles

• S = 4 minutes

• S = 4 min/miles

• S = 4 miles/min

Multiple Choice

Which of the following could be a correct answer for solving for the time?

• t= 4 kilometers

• t = 4 km/hr

• t = 4 hr

• t = 4hr/km

Multiple Choice

Which of the following could be an answer if solving for the distance?

• d = 4 seconds

• d = 4 meters/second

• d = 4 seconds/meters

• d = 4 meters

Multiple Choice

If Sally is speeding through the parking lot at 18m/hr, and she travels 9 m, how long did it take her?

• 2 m/hr

• 0.5 hr

• 2 m

• 0.5 m

Multiple Choice

The speed of an object at one instant of time is called:

• Average Speed

• Instantaneous Speed

• Velocity

• Acceleration

Multiple Choice

The speed shown on the speedometer of a car is the

• Total speed

• Highest speed

• Average speed

• Instantaneous speed

Multiple Choice

The rate at which speed changes is known as;

{How quickly speed changes}

• Speed

• Velocity

• Acceleration

• Slope

Multiple Choice

What is the person doing from 5 seconds to 10 seconds?

• Walking at a constant speed

• Running fast

• Not moving

• Walking slow

Multiple Choice

What does this graph represent?

• Constant Speed

• Acceleration

• Decceleration

• Not moving

Multiple Choice

According to the graph what was the average speed?

• 0 m/s

• 1.2 m/s

• 0.8 m/s

• 12 m/s

Multiple Choice

Soccer ball A goes 15 feet in 3 seconds, and ball B goes 12 feet in 2 seconds. Which ball moved the fastest?

• Soccer ball A

• Soccer ball B

• Their speeds are equal.

Multiple Choice

What is the formula for average speed?

• Average Speed = Total Time undefined Total Distance

• Average Speed = Total Time + Total Distance

• Average Speed = Total Distance $$\div$$ Total Time

• Average Speed = Total Distance $$\times$$ Total Time

Multiple Choice

the speed relative to an observer

• average speed

• relative speed

• regular speed

• motion

3.3 Pressure in Gases

Use pages 162-163 to complete this lesson;

Lesson objectives;

At the end of this lesson, you should be able to;

• Describe the factors that affect gas pressure

• Describe how atmospheric pressure changes with height

Fill in the Blank

Page 162; {Separate your answers with commas, NO spaces, watch the spellings}

The collisions between the air ____ and the balloon produce ___ pressure

Multiple Select

Today's 3.3 lesson objectives are;

• interpret distance-time graphs

• describe relative motion

• describe the factors that affect gas pressure

• describe how atmospheric pressure changes with height

• describe how changes in speed cause acceleration

Multiple Choice

Page 162; Lots of collisions inside the balloon make a ____ gas pressure

• low

• medium

• equal

• none of these

Fill in the Blank

Page 162; Lots of collisions inside the balloon make a ____ gas pressure

Multiple Choice

TRUE or FALSE;

Gas pressure is exserted in only specific directions

• TRUE

• FALSE

Multiple Select

Page 162;

What happens when you squash the volume of a gas into a smaller volume? (Select 3 answers)

• There will be more molecules because of a higher pressure

• There will be more collisions between the molecules and the walls of the container

• The pressure increases because there are more collisions

• The temperature increases because there are more collisions

Multiple Select

Page 162; (Try this at home - HW)

What happens when you blow a balloon and place it inside the fridge to decrease its temperature?

• The molecules move more slowly

• The pressure goes down

• There are fewer collisions

• The balloon will collapse

• The balloon will keep its shape

Multiple Select

Page 163;

What happens when you compress more air into a bicycle tyre as you pump it up!?

• There are less molecules in the same space

• There are more molecules in the same space

• The pressure is bigger

• A bigger force is exerted by the gas

• There are more gas molecule collisions inside the tyre

Fill in the Blank

Page 163; (Watch the spelling)

You need a strong container to hold a _______ gas

Multiple Choice

Page 163; The pressure exerted on our bodies by the air around us is known as;

• air pressure

• gas pressure

• pressure

• atmospheric pressure

Multiple Select

Page 163; How come we do not feel the atmospheric pressure pushing on us from all directions around us?

{Select two answers

• It cancels itself out

• Its cancelled out by the gasses

• Its cancelled out by the pressure of the gases and liquids in your body pushing out

• It's balanced by our body's internal pressure

Multiple Choice

TRUE or FALSE; Page 163

The atmospheric pressure at sea level is the same as the the atmospheric pressure up a high mountain

• TRUE

• FALSE

Multiple Select

Page 163; (Select 4 answers

Which of these are true about atmospheric pressure?;

• Gravity pulls the air particles towards the earth

• The particles are closer and there are more collisions near the earth's surface

• The pressure is higher at the earth's surface

• The temperature is higher closer to the earth's surface

• The temperature s lower closer to the earth's surface

Fill in the Blank

Page 163;

The gas has a higher _____ at sea level

Multiple Choice

Page 163; What does it mean to say "the gas has a higher density"?

• there is more mass of a gas in a certain volume

• there is less mass of a gas in a certain volume

• there is equal mass of a gas in a certain volume

• None of these

Multiple Choice

Page 163;

Why do mountaineers often take oxygen tanks when climbing high mountains like Everest?

• There is high atmospheric pressure, which leads to low oxygen levels

• There is a smaller atmospheric pressure, which leads to low oxygen levels

• There is no atmospheric pressure, so they need oxygen tanks to breathe

• The tanks contain oxygen gas

Multiple Choice

TURE or FALSE; Page 163

Oxygen tanks contain oxygen gas that has been compressed into a smaller volume

• TRUE

• FALSE

Multiple Choice

If a hairspray can is heated, what can be expected of the pressure of the gas inside the can?

• The pressure will increase

• The pressure will decrease

Multiple Choice

In what direction(s) does air exert pressure?

• In all directions

• In no direction

• there is no pressure

Multiple Choice

We can increase the pressure of a gas by:

• Not changing the temperature of the gas

• Decreasing the temperature of the gas

• Increasing the temperature of the gas

Multiple Choice

How do gas molecules move? 

• in an orderly fashion 

• constantly and randomly

• in a circular motion

Multiple Choice

True or False: Gases can be compressed. 

• True

• False

Multiple Choice

Which container will have a lower pressure?

• left

• right

• they both have the same pressure

Multiple Choice

If a balloon is cooled what will happen to the volume?

• Volume will increase

• Volume will decrease

• Volume will not change

Multiple Choice

The pressure inside the balloon will:

• Decrease

• Increase

• Remain the same

Multiple Choice

The pressure of the gas in the balloon in the ice water will be:

• Greater than that of the balloon in the boiling water.

• Less than that of the balloon in the boiling water.

• The same as that of the balloon in the boiling water.

Multiple Select

We can increase the pressure of a gas by:

• Adding more gas.

• Reduce the volume of the container.

• Increase the temperature of the gas.

• None of the above answers.

Multiple Choice

The reason gases can be compressed is because:

• The particles are very close together.

• The particles are merely vibrating.

• The particles are unable to move.

• The particles are very far apart.

Multiple Choice

Where would you find the largest pressure?

• At the bottom of the ocean

• At the top of Mt Everest

• Close to ground on the Scotch oval

• In a rockpool on the Great Barrier Reef

Multiple Choice

Why is it hard to breath at high altitudes?

• There is too much oxygen in this location.

• There is a higher density of air molecules.

• There is a low density of air molecules.

• The air pressure is greater than at low altitudes.

Multiple Choice

When a diver dives deeper into the ocean, he will experience ...................... liquid pressure

• greater

• less

• no

Multiple Choice

Pressure rxerted by air on the earth's surface

• Pressure

• Atmospheric pressure

• Heat pressure

Multiple Select

What were today's lesson objectives?

{ALL DONE! - DO THE HW ASSIGNMENT ON GOOGLE CLASSROOM}

• Describe the factors that affect gas pressure

• Describe how atmospheric pressure changes with height

• describe what happens to a balloon in a fridge

• Calculate speed