Forces and Motion
Points to Remember
- A force is a push or a pull. Balanced forces acting on an object cause the object to be at rest, and unbalanced forces acting on an object cause the object to move.
- Mass is a measure of the amount of matter in an object. The weight of an object is a measurement of the gravitational pull on the object. The amount of gravitational force produced depends on the mass of an object and the distance from its center to the center of the object that is pulling on it.
- Speed, velocity, and acceleration are ways of describing the motion of an object.
- Newton’s first law states that an object at rest will remain at rest and an object in motion will remain in motion unless a force acts on it. Newton’s second law states that the acceleration of an object depends directly on the force applied and inversely on it mass. Newton’s third law states that every action has an equal but opposite reaction.
- Work is done when an applied force moves an object. Machines make work easier. The six simple machines are the lever, inclined plane, screw, pulley, wheel and axle, and wedge.
Points to Remember
- A force is a push or a pull. Balanced forces acting on an object cause the object to be at rest, and unbalanced forces acting on an object cause the object to move.
- Mass is a measure of the amount of matter in an object. The weight of an object is a measurement of the gravitational pull on the object. The amount of gravitational force produced depends on the mass of an object and the distance from its center to the center of the object that is pulling on it.
- Speed, velocity, and acceleration are ways of describing the motion of an object.
- Newton’s first law states that an object at rest will remain at rest and an object in motion will remain in motion unless a force acts on it. Newton’s second law states that the acceleration of an object depends directly on the force applied and inversely on it mass. Newton’s third law states that every action has an equal but opposite reaction.
- Work is done when an applied force moves an object. Machines make work easier. The six simple machines are the lever, inclined plane, screw, pulley, wheel and axle, and wedge.