- Newton's First Law of Motion is also known as the Law of Inertia, which states that an object at rest tends to stay at rest, and an object in motion tends to stay in motion unless acted upon by an external force.
- Newton's Second Law of Motion states that the greater an object’s mass, the more force is needed to accelerate it.
- Newton's Third Law of Motion states that for every force acting on an object (called an action), there is an equal and opposite reaction.
- Force is something that pushes or pulls an object and can move, stop, speed up, or slow down an object; it can also change its shape.
- Gravity is the most ubiquitous force on Earth, pulling objects toward themselves and keeping things on Earth touching the ground.
- Direction refers to how an object moves when a force is applied.
- Strength refers to how much force is exerted; the stronger the force, the farther an object will move.
- Acceleration refers to a change in velocity, which is a combination of speed and direction.
- When acceleration and velocity are in the same direction, an object speeds up; when they are opposed, an object slows down.
Parent Tip: Review the logic above to help your child master the concept of 9th grade reading passages printable.
