c5 - forces

Created by

Ebony stevens

Cards (30)

acceleration = change in velocity / time taken
speed = distance / time
change in velocity equals the change in speed OR direction
acceleration equals the rate of change in velocity
terminal velocity is when two forced acting on an object are equal and opposite
force = mass x acceleration
terminal velocity happens during the final stage of an objects fall
reaction time depends on what?
age, alcohol, drugs, tiredness, distractions, illness
thinking distance is the distance travelled during a drivers' reaction time
braking distance is the distance travelled under the braking force
stopping distance = thinking distance + braking distance
what are the factors affecting braking distance ?
speed of vehicle, mass of vehicle, road conditions, conditions of vehicle
1st law of motion - an objects motion will not change unless acted upon by a resultant force
2nd law ops motion - mass and acceleration are inversely proportional
m = 1/a
resultant force = mass x acceleration
inertia is the tendency of objects to continue in their state of rest or uniform motion
inertial mass measures how difficult it is to change the velocity of an object
momentum = mass x velocity
in a closed system, the total momentum before an event is equal to that after an event
momentum is a vector quantity
the moment of a stationary object is 0
hookes law states that extension is directly proportional to force
deformation is the changing shape of something, to do this, an object must be bent, stretched or compressed
inelastic deformation : an object will not return to its original shape
elastic deformation : an object will return to its original shape
elastic potential = (spring constant x 1/2) x extension ^2
force = spring constant x extension
the mass of an object is a measure of the amount of matter it contains - NEVER CHANGES
Displacement is the distance an object moves in a straight line from a start to end point
resultant force is the sum of all the force acting on an object