Lesson 6. Flashcards
How do you calculate velocity?
Write down what you know. Make the final velocity the subject of the equation:
(final velocity)^2 =
(2 × acceleration × distance) + (initial velocity)^2.
Calculate the final velocity.
What is the formula for kinetic energy?
kinetic energy (J) =
0.5mv^2
How do you calculate kinetic energy?
Write down what you know. Choose the values with standard units. Use the equation for kinetic energy to find the answer.
kinetic energy = 0.5 × mass x (speed)^2.
How do you calculate speed from kinetic energy?
Write down what you know and estimate the mass. Make speed the subject of the equation. Calculate the speed.
What is the formula for calculating speed from kinetic energy?
The square root of kinetic energy/0.5 x mass.
What is the formula for mass?
M = 2Ke/v^2.
What is the formula to find initial speed?
V^2 - (2 x acceleration x displacement).
What is the formula for velocity?
2as + u^2.
Rearrange the equation (2as + u^2) to make a then s the subject.
1) a = v^2 - u^2/ 2s.
2) s = v^2 - u^2/ 2a.
What is the formula for finding velocity from kinetic energy?
It is the square root of 2Ke/M.
