Kinematics Flashcards
what is displacement?
- the sortest route between two points
- distance and direction
- vector quantity
what is a position?
a location relative to a fixed point
what is distance?
- a scalar quantity
- no direction
what is speed?
- the distance travlled over a period of time
- scalar
what is velocity?
- total displacment travlled over a period of time
- vector quantity
what do distnace time graphs show us?
- speed as gradient
- stationary points
doesnt show direction
what do displacment time graphs show?
- stationary periods
- gradient = velocity
- line curving up= velocity increasing, accelerating
what must you take into consideration when caluclating displacment or velocity?
- veloicty is a vector so the direction (positive negative) must be used with the displacemnt when calculating
what are some general mistakes?
- units: always highlight the units in the question, especially on the graph
- direction: make sure you label the positive and negative direction, and use these carefully in calculation
what can you find from a speed time graph?
- area beneath the graph is the distance travelled
- gradient =
Describe the journey of the three different cars
what does the area under a velocity time graph imply?
- if area is completly positive/negative then it is distance
- if area is a combination of positive and negative area then it is displacement
Fill out the table
What are the five SUVAT equations and under what assumption are they used-?
Assumption: Acceleration is constant
Derive the SUVAT equations
What is the downwards acceleration of gravity, according to this exam board ?
9.8
Fill in the blanks
A lorry of length 16m is travelling at constant speed of 12ms in the insidie lane of a stright road. A car of length 4m is initially travelling in the outside lane in the same direction as the lorry at the same speed. The gap between the two vehicles is 50m. The car accelrates at 2ms for 5 seconds, then travels at a constant speed for 5 seconds. Now the car is travelling at the same speed as before but in front of the lorry and the gap is the same as it was before. How long did the car take to get form its initial to its final position, and how far did the car travel in this time?
