7.8- PROJECTILE MOTION 2 Flashcards
What will any form of motion where an object experiences a constant acceleration in a different direction to its velocity be like?
projectile motion
Example of something that will be a projectile path?
path of a ball rolling across an inclined board
How is the object projected on the inclined board?
across the top of the board from the side
What is the path of the ball rolling across an inclined board like? (2)
path curves down the board + is parabolic
Why is the path parabolic when a ball rolls across an inclined board?
object subjected to constant acceleration acting down on board + its initial velocity is across board
Another example of parabolic path?
path of a beam of electron directed between two oppositely charged parallel plates
What is each electron in the beam acted on by? (parabolic path)
constant force towards positive plate
Why is each electron in the beam acted on by a constant force towards the positive plate? (parabolic path)
as charge of an electron is negative
What does each electron experience due to the charge of the plate and itself? (parabolic path)
constant acceleration towards the positive plate
Why is the path of the electrons in the beam parabolic? (parabolic path)
its motion parallel to plates is zero acceleration whereas its motion perpendicular to plates is at constant (non-zero) acceleration
What does a projectile moving through air experience?
a force that drags on it
Why does a projectile moving through air experience a force that drags on it?
because of the air resistance of the air it passes through
What is the drag force that a projectile moving through air experience partly caused by?
friction between layers of air near projectile’s surface where air flows over surface
What direction does the drag force act?
opposite direction to direction of motion of projectile
When does the drag force increase?
increases as projectile’s speed increase
