pmt Flashcards
1
Q
describe how the velocity of an object can be found using light gates
A
- set up light gates vertically and measure distance between them
- connect them to a data logger and drop an object from rest above them, measuring the time it takes for the object to travel between the two gates
- use distance and time to calculate velocity
2
Q
describe how to use light gates to investigate conservation of motion
A
- place 2 carts on a linear air track with repelling magnets so they don’t stick to each other
- attach card to the top of each cart so that they break the beams of the light gates when the pass
- keep one cart stationary and push the other towards it, measuring its velocity before the collision
- then measure the velocity of both carts after the collision and calculate the momentum before and after
3
Q
what is terminal velocity?
A
when forces on a falling object (drag & weight) become balanced so the resultant force is zero, acceleration is also zero and the object is moving at maximum velocity
4
Q
what is a couple?
A
two forces that are parallel, equal in magnitude, opposite in direction and act along different lines
5
Q
why does an object submerged in fluid experience upthrust?
A
the pressure on the bottom surface is greater than the pressure on the top surface
6
Q
A
7
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A
8
Q
A
