Module 1 - ALevel Experimentations (Module 3 PAGs)

Question 1

List the equipment used in the determination of g using light gates

Answer 1

• Electromagnet connected to a steel ball
• 2 light gates vertically below ball connected to data logger
• Metre rule to measure distance between light gates

Question 2

What is the method of collecting data for determining g

Answer 2

• Position the lower light gate 1m below the top one
• Turn off the electromagnet
• Note the time taken for the ball to fall between the ball bearings on the data logger
• Repeat to find mean values of time for that height
• Repeat, decrementing the distance between the lower and upper gate by 0.05m

Question 3

Describe the graphical method of determining g

Answer 3

s = ut + 0.5at²
h = ut +0.5gt²,
- draw a graph of h against 0.5t², and the gradient is g

Question 4

List the equipment used in the determination of terminal velocity

Answer 4

• Long plastic tube
• Marker to mark regual distance intervals
• Clear viscous fluid
• Stopwatch

Question 5

What is the method of collecting data to determine terminal velocity

Answer 5

1. Mark the tube at regular intervals of distance
2. Hold a bearing over the liquid and drop it from rest
3. At the time of release start a timer
4. Lap the timer at each marked interval
5. Calculate the average velocity for the different intervals

Question 6

What is the graphical method of determining terminal velocity

Answer 6

• plot a vt graph
• the terminal velocity is when the velocity is constant

Question 7

What are two things you could improve with the terminal velocity experiment and why

Answer 7

• Use a taller tube allowing the ball to travel at terminal velocity for longer
• Use larger distance intervals to reduce uncertainty in distance and time

Question 8

List the equipment used in the determination of Young Modulus

Answer 8

Clamp
Wire
Metre Ruler
100g masses
Pulley

Question 9

Describe the method for collection of data when dewtermining Young Modulus

Answer 9

• Measure the diameter in different places in different orientations along the wire and take a mean
• Place a mark on the wire on where original length will be measured
• Measure the original length from the clamp to the mark on the wire when taut
• Repeatedly add 100g masses to the wire measuring the new length to the marker each time until you have 7 readings

Question 10

What is the graphical method to determine terminal velocity

Answer 10

• For each mass: 1. force applied is mg
  2. the extension is length measured-original length
  3. Measure stress = F/A
  4. Measure strain = x/l
• Draw a stress strain graph and the gradient in the elastic region is the young modulus