MEDI11002 Physics For Health Sciences

Question:

Part 1

A glossary listing all keywords that you have used in your Part 2 answers.

Every keyword must be described in your glossary.

Include symbols and units associated with the keyword.

Once you have identified a keyword in the glossary, you are able to use that term in your Part 2 responses without needing to redefine it again.

You can also include any equations used in Part 2 to solve it.

Part 2

Please indicate whether you believe the statement to be true or false for each one of the following statements and give your reasoning.

A medical supply trolley being wheeled along a curving path will maintain its velocity and acceleration.

A tourniquet is an elastic band that is placed around the arm of a patient. It does not work and it has no energy.

A student healthcare professional is asked to lift a 12-kg box from its original place onto a shelf. Its height is 0.3 m above the ground.

The student holds the box tightly and is moving in a straight line at 0.15 m/s.

As the student approaches the shelf, another student opens the door to the area.

Can the student apply sufficient force to stop in two seconds? If the door opens at 1.0 m, can he avoid a collision with the box?

(Suppose that the student is using the same amount of force during that period.

You wait to get your next lecture and then you decide to buy a single-serve soft beverage in a standard plastic jar with a screw-on cap.

When you open the lid, fluid seeps from the bottom of your bottle.

The lid is reattached to the bottle so that it can be returned to the store.

Once you have put the lid back on the bottle, the flow stops from the hole!

i. Identify the differences between the properties and plastic bottles of soft drinks.

Explain why flow did’t begin until the lid was taken off the bottle.

Answer:

Part 1

Velocity – The distance traveled per unit time.

Acceleration rate of change of velocity per unit of Time Factor

Work – An activity that uses physical or mental capabilities

Force – interaction that when unopposed changes the motion a body’s body

Adhesion is the attraction of similar molecules or particles

Atmospheric pressure – Pressure that is caused by the atmosphere’s weight.

Part 2

False. The acceleration and velocity are dependent on the direction of the movement. They can therefore change.

Since the distance is zero, there is no work.

When there is a distance movement, work is done.

The band still has potential energy that can be stored when it is stretched.

Mass = 12kg

Hight =0.3m

Distance = 5.5m

Speed = 0.15m/s

The box was moved by force

F = ma

It takes 0.15 seconds to move 5.5 meters.

T =d/s

= 5.5/0.15 = 33.6667 seconds

Acceleration = speed/time

Force = mass x acceleration

= 12 x 0,0409 = 0.49 N

It took 1 m for the opening door to be spotted.

The force and mass of the student are constants so the student will need the same acceleration in order to stop when he sees a door.

Force = 0.049N

Acceleration = F / m = 0,049/12 = 0.00409 M/s2

1/2 = 0.5 m/s. This is the speed at which the student needs to move to avoid knocking at the door.

Time it takes to stop carrying the box = velocity/acceleration

= t =v/a

Time = Velocity / Acceleration

= 122.25 second

This means that the collision will be prevented by 2 seconds.

The soft drink and plastic have different types and their cohesive forces are lower than those between similar molecules.

This means the drink will flow freely when it is offered and attract no plastic molecules (Field Trip videos inc. and AIMS MEDIA).

Additionally, the different molecule types can enhance the flow out of soft drinks.

The attraction of similar molecules between molecules can increase the detachment every time the bottle is opened.

Additionally, liquid particles are tightly parked while solid ones are tightly packed.

Additionally, liquid particles can jigle and slide between each other, which leads to flow. Solid particles, however are tightly parked and don’t move.

The lid being opened can exert more pressure on top of the liquid, leading to the liquid flowing out of the container.

The atmospheric pressure can add to the liquid’s pressure, causing flow (Rodgers, Evans, & Leigh Marine Laboratory, 1984). In the opposite case, when the bottle closes, the atmospheric pressure is withdrawn, resulting in the cessation of flow.

The atmospheric pressure is constant. When it acts, it creates pressure differential between the top and bottom bottles. This can lead to the outflow of soft drinks.

The drink can also create additional pressure by adding atmospheric pressure.

The bottle’s pressure at its bottom is the same as that at its top (Rodgers, Evans, & Leigh Marine Laboratory, 1984).

This means that soft drinks will not flow out if there is no additional pressure.

References

Field trip videos inc. and AIMS MEDIA.

Temperature, pressure, and humidity.

CharyFieldh: AIMS Media.

Rodgers, D. W., Evans J. H., & Leigh Marine Laboratory.

Atmospheric pressure

University of Auckland Marine Laboratory.