1. Newton’s First Law of Motion (Law of Inertia) 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.
2. Newton’s Second Law of Motion states that the greater an object’s mass, the more force is needed to accelerate it; mathematically, F = ma.
3. Newton’s Third Law of Motion states that for every action, there is an equal and opposite reaction.
4. Force is defined as something that pushes or pulls an object, capable of moving, stopping, speeding up, slowing down, or changing its shape.
5. Gravity is Earth’s gravitational force, which pulls objects toward the ground and is the most ubiquitous force on Earth.
6. Direction refers to how an object moves when a force is applied.
7. Strength refers to how much force is exerted — the stronger the force, the farther the object will move.
8. Acceleration is a change in velocity, which is a combination of speed and direction.
9. When acceleration and velocity are in the same direction, an object speeds up; when they are opposed, it slows down.
10. Inertia is resistance to a change in motion, as described in Newton’s First Law.
Parent Tip: Review the logic above to help your child master the concept of 9th grade reading comprehension worksheet pdf.
