Motion

speed

time graphs

Acceleration

flat lines mean the object is stationary

stopping distances

Momentum

Speed is a measure of how fast an object is moving.

Stopping Distance is the time it takes to stop from a certain speed to 0 while moving

Speed is stated as a length per unit of time. For example a speed could be 70 miles per hour, while another speed could be 45 metres per second.

Calculate speed using the speed equation - speed = distance divided by time. The speed equation can be rearranged to find distance travelled and time taken.

up means the object is taveling away from the place

The steeper the slope the faster the speed

vice verca

to figure out the force of something, you need to times the mass by the acceleration

to find out mass, you need to divide force by acceleration

Acceleration is the increase of somethings speed or rate

to find out acceleration, you need to divide the change in speed by time.

Drag Forces and friction

Drag Forces

Friction

Ways to reduce it

Lubrication is where oil or grease are put on object to make it slippery/ less friction

Drag forces are like friction types, eg, water, air and other elemental resistances reduce speed to varying degrees

Friction is where particles are in the way of others, the blocked particles use some energy to either move past or push the blocking particle out of the way

For example an elephant has no momentum when it is standing still. When it begins to walk it will have momentum in the same direction as t is travelling. The faster the elephant walks the larger the momentum will be

Momentum is the product of mass and velocity. momentum is also a vector quality - this means it has both a magnitude and a direction.

calculations

stopping distance

force

Momentum

mass x velocity

p =mv

Mass (m) is measured in kilograms (kg)

Velocity V is measured in metres per second (m/s)

Momentum (p) is measured in kilogram metres per second (kgm/s).

thinking distance + braking distance.

mass x acceleration

friction

coefficient of friction x normal force

speed

distance travelled / time taken

Thinking distance and Breaking Distance

Thinking Distance between seeing something and then doing something to slow down

Braking Distanceis the time it takes for the slowing factor to slow you down until stopping