Please enable JavaScript.
Coggle requires JavaScript to display documents.
FORCES (Acceleration (Change in velocity over time (acceleration = change…
FORCES
Acceleration
-
In a graph:
acceleration = (final v - initial v) divided by time
negative number = deceleration
- total area under graph = distance in a specific direction
-
-
Force and braking
When a car brakes , kinetic energy is converted into other types of energy
Friction between brake and wheel, thermal in brakes
-
-
Levers and gears
Levers = force multipliers, turning effect is transmitted from one side of pivot to other side
-
-
-
Gravity and weight
Gravity - force of attraction between all objects
Weight - the force acting on an object due to gravity
-
-
Resolving forces
Horizontal arrow = all forces acting horizontally
Vertical line = all forces acting vertically
Diagonal line = forces partly acting horizontally and part vertically
Vector diagrams
scale drawing showing forces e.g. 1cm = 1N
Use a protractor to measure the angle
complete the parallelogram
Draw a line from the tails of the force vectors
*The size of this line = the resultant force
-
-
-
Pressure in fluids
When particles collide with the walls, a force is exerted
-
-
-
Distance-time graphs
If an object moves in a straight line, its distance can be determined using these graphs
Forces on a skydiver
Jumps out - downward force of weight due to gravity
fall - air resistance due to friction with air and weight is greater
Terminal velocity 1 - both velocity and air resistance increase and both become balanced
Open parachute - air resistance is greater due to large surface area
Terminal velocity 2 - velocity and air resistance both now decrease and will become balanced
Newtons laws of motion
First law:
An object will remain stationary or move at a constant speed when the force acting on it is 0
Second law:
An object is proportional to the resultant force and inversely proportional to its mass
Third law:
When 2 objects interact, the forces they exert on each other are equal and opposite
-
-
-
