Force is a push or a pull exerted on one object by another object.
A force can be an external force meaning that the force comes from outside the object rather than inside of it. There are also internal forces where the force comes from inside the object itself. External forces can cause a change in an object’s motion, but internal forces cannot.
Learn more about force in the following Whybricks activities:
Students are introduced to Newton’s three laws of motion – Newton’s first law of motion (inertia), Newton’s second law of motion (F=ma) and Newton’s third law of motion (for every action, there is an equal and opposite reaction).
This project investigates two forces that make bridges useful to people: normal force and tension. Students first investigate how normal force allows a bridge to support a load.