PRE SACE PHYSICS Flashcards
What is Displacement?
The length from starting point to finishing point
What is Distance?
the length of total travel
What is Speed
the rate at which something moves
What is Average Speed
the rate at which someone or something moves over a certain time period
What is Velocity
the rate at which something moves in a direction
What is Acceleration
the rate of change of the velocity of an object over time
What is the difference between acceleration and deceleration?
acceleration is increasing in speed, deceleration is decreasing in speed
How to find the average speed when the distance and time is provided.
Distance Divided by Time
How to find the time when the average speed and distance is provided.
Distance divided by Speed
How to find the distance when the speed and time is provided.
Speed Times Time
A helicopter’s speed increases from 25 m/s to 60 m/s in 5 seconds. What is the acceleration of this helicopter?
The formula is V2 - V1 divided by the time.
As she climbs a hill, a cyclist slows down from 25 m/s to 6 m/s in 10 seconds. What is her deceleration?
V2-V1 divided by the time
Steps to Find out the Kinetic Energy
Mass x Velocity, then square it, then half it
How to convert Km/h, to m/s
divide by 3.6
Convert M/S to KM/H
multiply by 3.6
How to find the mass with the kinetic energy and velocity provided?
2 x KE, Divided By Velocity Squared
How to find the velocity when kinetic energy and mass is provided?
2 x KE, Divided by Mass, then square root
How to find the displacement?
A squared plus B squared = Square root of C squared
How to solve for V2
v1+ a x t
A car traveling at a speed of 30.0 m/s encounters a kangaroo and comes to a stop. How much time will it take for the car to stop if it decelerates at -4.0 m/s2?
t = v2+ v1divided by acceleration
Example of Displacement
KM NORTH, CM North
Example of Distance
KM,M,CM,MM
Example of Speed
M/S, KM/H
Example of Average Speed
M/S, K/H
Example of Velocity
5 M/S East, 10KM/H south
Example of acceleration
M/S/S
