P2.1.6 - Equation of Motion and Kinetic Energy

Question 1

What equation links velocities, acceleration, distance/displacement and time?

Answer 1

Final velocity squared - initial velocity squared / 2 * acceleration * distance

Question 2

Why do physicians refer to displacement in the equation rather than distance?

Answer 2

Displacement has a direction, like velocity, so it makes more sense to use displacement

Question 3

What is a kinetic store?

Answer 3

A system for which we can do an energy calculation

Question 4

What is the equation for calculating kinetic energy?

Answer 4

0.5 * mass * speed squared = kinetic energy

Question 5

What is kinetic energy measured in?

Answer 5

Joules (J)

Question 6

What other values can you calculate by rearranging the equation for kinetic energy?

Answer 6

Mass and speed

Question 7

Rearrange the equation for Kinetic Energy to calculate mass

Answer 7

Mass = 2 * Kinetic Energy / speed squared

Question 8

Rearrange the equation for kinetic energy to calculate speed

Answer 8

Speed = square root of 2 * kinetic energy / mass

Question 9

If an object’s speed and mass are higher, is its kinetic energy high or low?

Answer 9

High

Question 10

If an objects sped and mass are lower, is its kinetic energy high or low?

Answer 10

Low