RPAs

Question 1

Force + Extension:

How do you set up the apparatus? (3pts)

Answer 1

Put clamp stand on table, held in place by weight.

Hang spring from clamp.

Hang a ruler next to it, so it starts at 0cm.

Question 2

Force + extension RPA:

What is the first step in the method?

Answer 2

Record the natural length of spring with no force on it by looking at the ruler?

Question 3

Force + extension RPA:

What is the second part of the method?

Answer 3

Place the mass holder on the end of the spring and record the new length.

Question 4

Force + extension RPA:

How do you find the spring constant?

Answer 4

Force divided by extension.

Question 5

Force + extension RPA:

What is the third step of the method?

Answer 5

Add a 100g mass onto the mass holder and record the new length.

Question 6

Force + extension RPA:

How many times do you repeatedly add 100g mass?

Answer 6

5 times.

Question 7

Force + extension RPA:

What is the correlation between force and extension?

Answer 7

Linear, direct correlation.

Then it levels out when the spring cannot be extended anymore.

Question 8

Force + extension RPA:

What is force measured in?
What is spring extension measured in?

Answer 8

Newtons
Meters

Question 9

Force + extension RPA:

How do you find spring extension?

Answer 9

Spring length - natural length.

Question 10

Waves RPA:

What is investigation about?

Answer 10

To measure the speed of ripples travelling on water.

Question 11

Light RPA:

Where do you place the mirror?

Answer 11

Upright on paper

Question 12

Light RPA:

what is the normal and where do you draw it?

Answer 12

Imaginary line at the mirror
90° to the mirror

Question 13

Light RPA:

where do you shine the ray box?
What is that light called? (2pts)

Answer 13

To the base of the normal
Light ray + angle of reflection

Question 14

Light RPA:

what do you do after shining the light ray?

Answer 14

Mark both rays with crosses

Question 15

Light RPA:

what do you do after marking rays with crosses?

Answer 15

Join up with ruler

Question 16

Light RPA:

what do you do after drawing the ray of reflection? And how?

Answer 16

Draw the angle of incidence by using a protractor by doing the angle between the normal and light ray.

Question 17

Light RPA:

what do you do after drawing the angle of incidence?

Answer 17

Draw the angle of reflection by using a protractor by measuring the angle between the normal and the angle of reflection

Question 18

Density RPA:

what do you do first with the irregular object?

Answer 18

Measure the mass with a top pan balance

Question 19

Density RPA:

where do you put the irregular object?
What is under that?

Answer 19

In a displacement can full of water up to the spout
Measuring cylinder

Question 20

Density RPA:

What happens once the object is in the can?

Answer 20

Water goes into the measuring cylinder

Question 21

Density RPA:

what does the water in the measuring cylinder mean?

Answer 21

It is the volume

Question 22

density RPA:

how do you find the density of the irregular object (formula)

Answer 22

Divide the mass by the volume = the density

Question 23

Light Refraction RPA:

What do you do with the glass block?

Answer 23

Place on paper and draw around it

Question 24

Light refraction RPA:

What do you do after drawing around the block?

Answer 24

Draw the normal to the centre of the block

Question 25

Light refraction RPA:

What happens with the ray box? 2pts (x)

Answer 25

Angle the light ray to the normal
draw crosses at both ends of the ray

Question 26

Light refraction RPA:

what do you do with the crosses?

Answer 26

Remove the block and match with a ruler and connect all the lines

Question 27

Light refraction RPA:

what angles do you measure and how? 2pts

Answer 27

Measure the incoming angle by measuring between the normal and incoming ray
Measure the angle of refraction by using protractor to measure between the normal in the block and the ray inside the block