Forces Flashcards
Vector
Physical quantity with magnitude and direction e.g. Velocity, pressure, weight, gravity, force
Scalar
Physical quantity with magnitude only e.g. Speed, length, area, time, distance
Forces are vectors so they can change…
Shape, direction, size, speed
Define resultant force
The net force acting on an object
Net meaning overall
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Eve must crucify roger reynolds groin like susans infection
Equipment Measurements Calculations Range Reliability Graph Looking for (answer) Safety Improvemnts
Newton’s 2nd Law
States that the acceleration of an object is directly proportional to the resultant force acting on it
Equation for newtons 2nd law
Resultant force= mass x acceleration
F = m x a
In N) (In kg) (In m/s2
Drag equation
Drag = friction + air resistance
All in N
Weight equation
W = m x g
N) (G/kg) (N/kg
What goes on the x axis
Independent variable (The one you change)
What goes on the y axis
Dependent variable (The results)
Mass stays ….. But weight and gravity …..
Constant
Vary
Resultant force equation
A = F / M
m/s2) (N) (g/kg
Speed equation
S = D / T
In m/s) (In m) (In s
What is the relationship between acceleration and mass
a (Directly proportional sign) 1/mass
Define thinking distance
The time it takes a driver to respond to an obstacle, reaction time
Define braking distance
The distance travelled between the driver braking and stopping
Stopping distance equation
Stopping distance = thinking distance + braking distance
What factors could affect thinking distnace
Alcohol influence
Poor visibility
Drug influence
Tiredness
What factors could affect braking distance
Vehicle with a large mass
Higher car speed
Road surface
Terminal velocity
Weight and drag force are exactly balanced
Acceleration is zero
Speed is constant
Stopping distance
Thinking distance + breaking distance
Acceleration equation
Change in velocity (final velocity - initial velocity)/time take
A = (v-u) /t
M/s(sq) = (m/s - m/s) /s
