motion Flashcards
displacement
dis travelled in given direction
velocity
rate of change of displacement
accelerate
rate of change of velocity
how can the terminal velocity of an object be determined using light gates
- 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
how can light gates be used to investigate conservation of linear momentum
- 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
experiment to determine g
- 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
ball projected of castle how does horizontal velocity change from launch until it hits the ground
horizontal velocity remains the same as there is no acceleration in the horizontal direction
in projectile motion what is the vertical acceleration
the vertical acceleration is equal to gravitational field strength downwards
when thinking about stopping thinking and braking diet what is the area under a velocity time graph represent
total distance travelled
why is braking distance proportional to v^2
all vehicles ke is dissipated by brakes
how does terminal velocity happen to object falling through fluid
- 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