Force and Acceleration

2. A simple model that shows all the forces acting on an object. It helps to visualize the size and direction of each force to determine the net force and predict the object’s motion.
6. Forces that are not equal, causing a change in an object’s motion.
7. A push or pull on an object by another object that is touching it. Contact forces can be weak or strong depending on the situation.
9. A measure of the change in velocity during a period of time. An object accelerates when its velocity changes due to a change in speed or direction.
10. Information or answers produced by examining something carefully and scientifically.
12. A hard covering on something's surface; in geological terms, it refers to the outermost layer of Earth.
14. States that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This can be represented by the equation a=m/F, where a is acceleration, F is the net force, and m is the object's mass.
15. The speed and direction of an object's motion.
17. A contact force that resists the sliding motion between two touching objects. Friction acts in the opposite direction of the motion and depends on surface texture and weight.
18. The constant velocity reached when air resistance equals the force of gravity on a falling object.

1. States that if the net force on an object is zero, the object’s motion does not change. This means balanced forces cause no change in motion.
3. A push or a pull on an object. It can be applied by one object or person to another, either through contact or at a distance.
4. The sum of all forces acting on an object. Net force determines the direction and rate of an object's acceleration.
5. Having little power or force.
8. A force that opposes the motion of objects moving through the air, slowing them down.
11. Forces that are equal in size and opposite in direction, resulting in no change in an object’s motion.
13. A group of mountains or hills in a line.
16. A drawing that shows the parts of something, often used to illustrate forces or other scientific concepts.