Relative Motion Flashcards
What is a uniform acceleration motion?
an object is moving at constant acceleration along a straight line.
In what ways we can express the constant acceleration?
3 ways :
1. v = Vi + at
2. d = Vi + at^2/2
3. v^2 = V^2i + 2ad
Distances travelled after each unit of time are not equal.
TRUE
The graph of distance against time is parabola; hence distance is inversely proportional to the cube.
FALSE, Directly and squared.
Define Free-falling
A free-falling object is one that is falling under the sole influence of gravity.
Does free-falling encounter air resistance?
FALSE. Not encounter.
What is the constant acceleration downward?
-9.8 m/s^2
How do you express a free fall that has zero initial velocity?
3 Possible ways:
1. v = gt (where g, stands for acceleration. t for time)
2. d = gt^2 /2
3. v^2 = 2gd
Constant negative slope indicates a constant negative acceleration
TRUE
Free falling objects always have the same downward acceleration.
TRUE
When moving upward: velocity is positive, and acceleration is? what will be the correct sign for constant acceleration? and is it slowing down or speeding up?
Negative. (-9.8m/s^2), slowing down.
When moving downward: velocity is negative, and acceleration is? what will be the correct sign for constant acceleration?
Also negative ( -9.8 m/s^2) but the object is speeding up.
An object free fall from a height without the initial velocity. The object hits the ground 2 seconds later. Acceleration due to gravity is 10 ms-2. Determine height.
SOLVE
An object dropped from a height of h above the ground. The final velocity when object hits the ground is 10 m/s. What is the time interval to reach ½ h above the ground. Acceleration due to gravity is 10 m/s2.
SOLVE
A fruit free fall from its tree at the height of 12 m above the ground. If acceleration due to gravity is g = 10 m/s2 and the friction of air ignored, then determine the height of the fruit above the ground after 1 second.
SOLVE.
What is the motion of an object thrown (projected) into the air?
PROJECTILE MOTION.
any object that once projected or dropped continues in motion by its own inertia and is influenced by the downward force of gravity?
PROJECTILE
Trajectory?
Path followed by an object.
What shape occurs in a projectile motion?
PARABOLA
The highest point the object reaches at the top of the parabola
HEIGHT
How to solve the total time spent by a projectile in air?
t = square root of 2dy/g .
For total distance fallen is equal to?
dy = gt^2/2
What is the horizontal displacement of projectile?
Range. Formula: dx =vxt
An eraser roll off the edge of a table with 0.72 m high and strikes the floor at a point 0.03 m horizontally from the edge of the table. Find the (a) time of its flight ; (b) its initial horizontal velocity.
SOLVE.
How to solve for x-direction (Range)?
Vx = vcosteta.
what is the formula for y-direction (height)?
Vy = vsinteta
