Pmt

Question 1

Descrive how the terminal velocity of an object can be determined using light gates

Answer 1

Set up light gates vertically and measure distance between them,
Connect them to a data logger and then release an object from rest above them, measuring time taken for object to travel between two gates,
Use time and distance to calculate velocity of falling object

Question 2

Describe how light gates can also be used to investigate conservation of momentum

Answer 2

Place two carts on linear air track (to reduce friction) with repelling magnets so they don’t stick together,
Attach card to top of each cart so they break beam of light gates when they pass,
Keep one cart stationary and push other towards it, measuring its velocity before the collision,
Measure velocity of both carts after the collision and calculate the momentum before and after

Question 3

Define ‘g’

Answer 3

The acceleration of freefall
A of an object in response to the gravitational attraction between the Eart and the object

Question 4

Describe the experiment in which one can determine ‘g’ using an electromagnet

Answer 4

E.Mgnt. holds steel ball suspended a measured distance above surface, then start timer when E.Mgnt. is deactivated; and stop when surface is hit
As ball was initially resting u=0
s=ut+1/2at^2
a=g

Question 5

What does upthrust depend on?

Answer 5

The object’s volume submerged in a fluid

Question 6

What is Archimedes’ Principle?

Answer 6

Upthrust exerted on body immersed in fluid = weight of fluid displaced