P8 Flashcards
Displacement
Distance in a given direction
Driving force
A force of a vehicle that makes it move
Newtons first law of motion
If the resultant force om an object is zero, the object stays at rest if its stationary , or keeps it moving with the same speed in the same direction
Newtons thirds law
When two objects interact with each other, they exert equal and opposite forces on each other
Scalar
Physical quantities like mass and energy
Vector
Physical quantaties that have maginitude and a direction
Weight equation
Weight= mass x gravitational field strength
Work done equation
Work done= force x distance
How many newtons meters does 1 joule equal
1 joule= 1 newton meter
Spring force equation
Force= spring constant x extension
Typical walking speed
1.5m/s
Typical running speed
3 m/s
Typical cycling speed
6 m/s
Distance travelled equation
Distance travelled = speed x time
Average Acceleration equatiom
Acceleration= change in velocity / time taken
How to find accleration fro, a velocity time grapj
Gradient
How to find the distance traveelled fro, a velocity time graph
Area under the graph
Equation that applies for uniform accelration
(Final velocity)^2 - (initial velocity)^2 = 2 x acceleration x distance
Resultant force equatiom
Resultsnt force= mass x acceleration
What is inertial mass
A measure of how difficult it is to change the velocity of an object
What is the stopping distance of a vehicle
The sum of the distance the vehicle travkes djring the drivers reaction time (thinking distance) and the distance jt travels under the braking force (braking distance)
Typical human reaction time
0.2 s to 0.9
Mometum equation
Momentum= mass x velocity
Conservevation of momentum
In a closed system the total momentum before an event is equal to the total momentum afger the event
