P2.1.6 - Equation Of Motion And Kinetic Energy

Question 1

What is the equation of motion?

Answer 1

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

Question 2

Why do we use distance in the equation of motion when it’s meant to be the displacement?

Answer 2

Distance and displacement have the same value since it is in 1 direction

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

Way is kinetic energy measured in?

Answer 5

Joules (J)

Question 6

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

Answer 6

Mass and speed

Question 7

How many joules are in 1kJ?

Answer 7

1000

Question 8

Rearrange the equation for kinetic energy to calculate mass

Answer 8

2 * Kinetic energy / speed squared = mass

Question 9

Rearrange the equation for kinetic energy to calculate speed

Answer 9

Speed = square root of 2 * kinetic energy / mass

Question 10

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

Answer 10

High

Question 11

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

Answer 11

Low