Hey Olivia! Would you like to do the pinewood derby with me?
That sounds great Ted. Lets work on it at my house tomorrow.
Before we start working on the car, let's think about forces.
First of all, force is a push or pull on an object.
I mean speed, velocity, acceleration, and more.
What do you mean?
Can you explain?
Speed is the distance an object travels per unit of time. Velocity is speed in a given direction. Acceleration is the rate at which velocity changes. Gravity is the attractive force between objects. And Friction is the force that two surfaces exert on each other when they rub against each other.
Ohh! I think I understand. Can you give examples of the forces?
All of these forces will affect our car when it is in motion and motion is the state in which one object's position from another is changing. Like when a ball moves on the ground or through the air.
Speed is like how fast a car moves. The velocity of the second hand of the clock in 60 seconds is 0. Acceleration is like when a car speeds up to get to the speed it wants to go. Gravity is like when a book is knocked off a shelf and it falls to the floor. Friction is when you kick a soccer ball and it eventually stops because of friction.
These are all examples of force. Do you understand?