motion

Question 1

displacement

Answer 1

dis travelled in given direction

Question 2

velocity

Answer 2

rate of change of displacement

Question 3

accelerate

Answer 3

rate of change of velocity

Question 4

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

Answer 4

• set up light gates vertically and measures the distance between them
• connect them to data logger and then release an object from rest above them, measuring the time it takes for the object to travel between the two gates
• using the time and known distance calc velocity

Question 5

how can light gates be used to investigate conservation of linear momentum

Answer 5

• place two carts on leaner air track with repelling magnets so that they do not stick together
• attach card to top of each cart so that they break the beams of the light gates when they pass
• keep one cart stationary and push the other towards it measuring its velocity before collision
• then measure the velocity of both carts after the collision and calculate the momentum before and after

Question 6

experiment to determine g

Answer 6

• an electromagnet holds steel ball suspended a measured distance above a surface, then start the timer when the electromagnet is deactivated and stop it when the surface is hit
• as ball initially resting u = 0
• the distance and time are known so use s = ut + 1/2at^2

Question 7

ball projected of castle how does horizontal velocity change from launch until it hits the ground

Answer 7

horizontal velocity remains the same as there is no acceleration in the horizontal direction

Question 8

in projectile motion what is the vertical acceleration

Answer 8

the vertical acceleration is equal to gravitational field strength downwards

Question 9

when thinking about stopping thinking and braking diet what is the area under a velocity time graph represent

Answer 9

total distance travelled

Question 10

why is braking distance proportional to v^2

Answer 10

all vehicles ke is dissipated by brakes

Question 11

how does terminal velocity happen to object falling through fluid

Answer 11

• velocity increases do does drag
• as weight remains constant the net force will decrease until reaches 0
• as a proportional to f, as force decreases so does acceleration
• at point where drag = weight and hence net force = 0 the object is no longer accelerating