Speed Velocity and Acceleration Everything You Need To Know About Motion.

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Presentation transcript:

Speed Velocity and Acceleration Everything You Need To Know About Motion

Motion Motion is just a change in position. To describe how an object moves you need A ruler to measure where an object is. And a clock to measure when an object is.

Here is a little bug located at 0 cm at 0 seconds.

10 seconds later he is at 50 cm.

SPEED The speed of the bug is just his distance traveled divided by how long it takes. Speed = distance/time Speed = 50 cm/10 s = 5 cm/s

Speed is just how fast something is moving. Speed is always a positive number. Quantities that can be described by a single number are called scalars.

MORE SCALARS TEMPERATURE VOLUME MASS STUDENTS IN A ROOM ENERGY

VELOCITY Velocity is speed and direction. Velocity is how fast and which way. Quantities that have direction are called vectors.

MORE VECTORS ACCELERATION FORCE DISPLACEMENT MOMENTUM

Suppose our bug starts off at 100 cm.

And ends up at 80 cm 10 seconds later.

Calculating velocity is a little more complicated than calculating speed. Velocity = change in position/time Velocity = (final position – initial position)/time Velocity = (80cm – 100cm)/10 seconds Velocity = - 2 cm/s

For objects moving along a straight line A positive velocity means moving to the right. (usually) A negative means moving to the left. (usually)

A negative velocity does not mean an object is moving slower than zero cm/s. You can’t move slower than standing still. It just means an object is moving in a certain direction.

ACCELERATION Acceleration is a change in velocity. So an object accelerates if it Speeds up Slows down Or changes the direction it is moving,

Acceleration = change in velocity/time Acceleration = (final velocity – initial velocity)/time Acceleration has units of velocity/time (meters per second)/seconds Or m/s/s or m/s 2

confusion Acceleration, like velocity, has direction. For objects moving along a straight line the direction of an object’s acceleration is denoted by plus or minus.

Acceleration = (30 m/s – 0 m/s)/10 s a = 3 m/s/s The car’s velocity is increasing 3 m/s per second. The car is accelerating towards the right.

a = (0m/s – 20 m/s)/10 s a = - 2 m/s/s Although the car is moving to the right It is accelerating to the left!

a = (final velocity – initial velocity)/time a = ( -30 m/s – 0 m/s)/ 10 s a = - 3 m/s/s The car is both moving to the left and accelerating to the left. Negative acceleration does not always mean an object is slowing down!

Newton’s Three Laws Newton showed that these laws of motion, combined with his law of universal gravitation, explained Kepler's laws of planetary motion.law of universal gravitationKepler's laws of planetary motion

1 = Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. law of inertia

2=The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector. law of resultant force

3= For every action there is an equal and opposite reaction. law of reciprocal actions