P2.1 Motion Flashcards
What are ways to calculate inhuman distances and times?
For quick times, you can use light gates that starts and stops a timer when an object interrupts a light beam.
For small distances, you can use ultrasound by measuring the time taken for a pulse to travel there and back. Then use the speed of pulse for distance.
What are the difference between a vector and a scalar?
A vector has a magnitude and a direction. A scalar only uses a quantity. Examples of vector are velocity and displacement. Examples of scalar are speed and distance.
What is acceleration, and how do you calculate it?
Acceleration is the change in velocity per second so it is a vector quantity. Deceleration is negative and Acceleration is positive.
Acceleration === Velocity Change/Time
How do you find velocity on displacement time graph?
If the velocity is constant, you calculate the gradient of the line, just like a distance time graph. If it has a variable velocity, you draw a tangent on the point your looking for, and work out the gradient.
How to calculate distance, displacement and acceleration on velocity time graphs?
Acceleration is the gradient of the line.
Distance and displacement are both the areas under the graph. Displacement only receives negative values when the velocity goes below 0.
What is the equation of motion?
(Final Velocity)^2 - (Initial Velocity)^2 === 2 x
Acceleration
x Displacement
How do you calculate kinetic energy?
Kinetic Energy (J) = 0.5 x Mass x (Speed)^2
