Lesson 6.

Question 1

How do you calculate velocity?

Answer 1

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.

Question 2

What is the formula for kinetic energy?

Answer 2

kinetic energy (J) =
0.5mv^2

Question 3

How do you calculate kinetic energy?

Answer 3

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.

Question 4

How do you calculate speed from kinetic energy?

Answer 4

Write down what you know and estimate the mass. Make speed the subject of the equation. Calculate the speed.

Question 5

What is the formula for calculating speed from kinetic energy?

Answer 5

The square root of kinetic energy/0.5 x mass.

Question 6

What is the formula for mass?

Answer 6

M = 2Ke/v^2.

Question 7

What is the formula to find initial speed?

Answer 7

V^2 - (2 x acceleration x displacement).

Question 8

What is the formula for velocity?

Answer 8

2as + u^2.

Question 9

Rearrange the equation (2as + u^2) to make a then s the subject.

Answer 9

1) a = v^2 - u^2/ 2s.

2) s = v^2 - u^2/ 2a.

Question 10

What is the formula for finding velocity from kinetic energy?

Answer 10

It is the square root of 2Ke/M.