Further Additional Physics

Question 0

What is the far point?

Answer 0

The furthest distance a person can comfortably focus on.

Question 1

What is refraction?

Answer 1

Caused when waves change direction as they enter a different medium. Caused by change in density from one medium to another - this changes speed.

Question 2

What is the near point?

Answer 2

The closest distance that the eye can focus on. The near point is aprox 25cm

Question 3

What are x-rays?

Answer 3

High frequency, short wave length electromagnetic wave

Question 4

What’s a CT scan?

Answer 4

Computerised axial Tomography, high resolution images of soft and Hard tissue

Question 5

What is ultrasound?

Answer 5

A higher frequency sound we can’t hear

Question 6

What is partial reflection?

Answer 6

When a wave passes through one medium into another, some of the wave is reflected off the boundary between the two media, and some is transmitted

Question 7

How are ultrasounds used in medicine?

Answer 7

Diagnose heart problems, investigating blood flow in organs, check fetal development, get rid of kidney stones

Question 8

What’s a converging lense?

Answer 8

It’s convex, bulges out wards (long sited)

Question 9

What’s a diverging lense?

Answer 9

It’s concave, caves inwards (short sited)

Question 10

What is a moment?

Answer 10

Turning effect of a force

Question 11

What a hydraulic system?

Answer 11

Used as force multipliers, uses. Small force to produce a big force. Use liquid and cross-sectional areas.

Question 12

What’s centripetal force?

Answer 12

Force that keeps something moving in a circle

Question 13

What’s a magnetic field?

Answer 13

A region where magnetic materials and also wires carrying currents experience a force acting on them

Question 14

What’s a solenoid?

Answer 14

Magnetic field inside of a coil

Question 15

What’s the left hands rule?

Answer 15

Thumb - motion
First finger - field
Second finger - current

Question 16

What’s electromagnetic induction?

Answer 16

The creation of a potential difference across a conductor which is experiencing a change in magnetic field

Question 17

What are 2 factors that speed up electric motors?

Answer 17

More current

Stronger magnetic field

Question 18

What’s a step up transformer?

Answer 18

Secondary coil thicker than primary coil, steps voltage up

Question 19

What’s a step down transformer?

Answer 19

Primary coil thicker than secondary, steps voltage down

Question 20

What’s PD?

Answer 20

Potential Difference

Question 21

What’s AC?

Answer 21

Alternating Current

Question 22

what are optical fibres?

Answer 22

fibres that use total internal reflection to send light over long distances