Speed, velocity, and acceleration can be confusing. However, it is actually very simple. We will think of these words as simple terms.
Speed- to make things easy, think of speed as how fast or slow something is. The car’s speed was very fast. The turtle’s speed was very slow.
Velocity- velocity is also very simple. Velocity is speed AND direction. So the velocity of something is how fast or slow it goes and where it goes. The car’s velocity changed when it turned left. If SPEED or DIRECTION changes, VELOCITY changes.
Acceleration- acceleration is the increase or decrease of speed. When you ACCELERATE, you are increasing or decreasing your speed. For example: if the acceleration of a car is 5m/s^2 (squared), then the speed will increase by 5m each second. So first, the car will start as 0m/s. One second later, it will be 5m/s. After two seconds, the car will be going at 10m/s. Remember that 5m/s^2 is EXTREMELY fast and that is why cars are measured in miles per hour.