Vocabulary#3: Simple Machines

Simple machine: A divice with few parts that makes it easer to do work.

Effort force: The force applied to a machine.

Resistance force:The force that a machine acts against.

Lever: A simple machine made of a rigid bar on a pivot point.

Fulcrum: The pivot point of a lever.

Mechanical advantige:The number of times a machine multiplies the force applied.

Pulley: A grooved  wheel that turns by the action of a rope in the groove.

Wheel and axle:A simple machine made of a handle or axis attached to the center of a wheel

Vocabulary#2: Energy

Potential energy:The energy stored in an object or material.

Gravitational potential energy: The potential energy of an object located above the ground.

Kinetic energy: The energy of a moving object.

Work: Force applied to an object times the distance the object moves.

Vocabulary#1: Newtons Laws

Force:A puch or pull extered by one objecton another.

Friction:A force thet opposes the motion of an object in cntact with a surface.

Drag force: A force that opposes the motion of an  object througha liquid or gas.

Gravity:A force of of attraction thar exists between all objects with mass

Net force: The combined effect of all the forces acting on an object.

Balance force: Forces that cancel each other out when acting together on a single object.

Unbalance force:Forces that do not cancel each other out when acting together on a single object.

Inertia: The tendency of an  object to oppose a chang in motion.

Momentum: The mass of an object multiplied by its velocity.