Middle School
Newton’s Laws of Motion
What makes things move, stop, or speed up? Explore inertia, try different pushes, and watch equal-and-opposite forces in action.
Newton’s 1st Law: An object at rest stays at rest. An object in motion keeps moving in a straight line at constant speed unless an unbalanced force acts on it.
Gravity pulls the soccer ball down. The ground pushes up just as strongly. These forces balance on the object, so it stays at rest.
Horizontal net force
0 N (Balanced)
Velocity
0.0 m/s (At Rest)
Inertia
Low · 0.5 kg
Moves on its own?
No · needs an unbalanced force