Force and Motion Mind Map

Force-and-Motion-Mind-Map
Frictions
- Static friction
- friction between two or more solid
objects that are not moving relative to
each other
- ex) a car wheel moving on a road
- Dynamic friction
- dynamic friction occurs when two objects are
moving relative to each other and rub
together
- ex ) sled on the ground
Centripetal force
- A force that makes a body
follow a curved path
- centripetal force = mass x velocity^2 / radius
- Circular motion
- the force keeping objects moving with a circular
path(orbit) acts towards the centre of the circle of motion.
IF the force stops, the object will continue in a straight
line.
Forces
- Newton's third law states that for every action
force there is an equal (in size) and opposite (in
direction) reaction force
- Reaction force
- the force that acts in the
opposite direction to an action
force
- Action force
- the force which acts on the
body due to some external
effort
Terminal velocity
- the drag force equals the driving force
Speed & Velocity & Acceleration
- Speed
- speed = distance / time
- how fast an object is moving
- scalar quantity(described by
magnitude alone)
- Velocity
- velocity = displacement / time
- the rate at which an object
changes its position
- vector quantity(described by
both a magnitude and a
direction)
- Acceleration
- final velocity - initial velocity / time
- the rate at which the velocity of
a body changes with time
- vector quantity
- Graphs
- Distance-time graph
- Calculating speed = gradient of slope
- Speed-time graph
- Calculating distance = area under the slope
Acceleration of Free Fall
- A free falling object is an object that's
falling under the sole influence of gravity.
- Chracteristics of free-falling objects
- Do not encounter air resistance
- All accelerate downwards at a
rate of 9.8m/s/s
- G (gravity) is always constant
- F = mg = ma
32 1 1