click below
click below
Normal Size Small Size show me how
Sci: Vocabs Chap.2
Chapter 2 Vocabularies
Term | Definition |
---|---|
Force | A push or pull on an object. |
Contact force | A push or a pull on one object by another that is touching it. |
Non contact force | A force that one object can apply to another object without touching it. |
Gravity | An attractive force that exists between all objects that have mass. |
Mass | The amount of matter in an object. |
Weight | The gravitational force exerted on an object. |
Friction | A force that resists the motion of two surface that are touching. |
Net force | The combination of all the forces acting on an object. |
Balanced forces | Forces acting on an object that combine and form a net force of zero. |
Unbalanced forces | Forces acting on an object that combine and form a net force that is not zero. |
Newton's first law motion | If the net force on an object is zero, the motion of the object does not change. |
Inertia | The tendency of an object to resist a change in its motion. |
Newton's second law of motion | The acceleration of an object is equal to the net force acting on the object divided by the object's mass |
Circular motion | Any motion in which an object is moving along a curved path |
Centripetal force | A force that acts perpendicular to the direction of motion, toward the center of the curve. |
Newton's third law of motion | When one objects exerts a force on a second object, the second object exerts and equal force in the opposite direction on the first object. |
Force pair | The forces two objects apply to each other. |
Momentum | A measure of how hard it is to stop a moving object. |
Law of conservation of momentum | The total momentum of a group of objects stays the same unless outside forces act on the objects. |