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51 Cartas en este set

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Acceleration
the rate of change in velocity, or the change in velocity per unit of time.
Balanced forces
forces that produce a net force equal to zero (no movement).
Charge
an electrical property that can be either positive or negative.
Compound machine
a machine made up of two or more simple machines.
Convection
the transfer of heat in fluids by the movement of currents that form in the fluids.
Current
a flow in a particular direction.
Data
information gathered in an investigation.
Data table
a chart that organizes data in rows and columns.
Density
the ratio of mass to volume of a substance.
Direction
the path that a moving object follows.
Electrical energy
the energy of moving electrical charges.
Electromagnetic radiation
energy that travels through space in the form of waves.
Energy
the ability to do work
Energy transformation
a change of energy from one form to another.
Force
a push or pull.
Friction
a force that tends to oppose motion between objects that touch each other.
Geotropism
a plant’s growth response to gravity (plant roots grow downward).
Gravity
a force that pulls all objects toward one another.
Heat
the flow of thermal energy.
Hydrotropism
a plant’s growth response to water.
Inclined plane
a simple machine consisting of a straight, slanted surface.
Inert
unable to react chemically.
Inertia
the tendency of an object to resist a change in its motion.
Kinetic energy
energy of motion.
Law of conservation of energy
a scientific law stating that although energy can change from one form to another, energy is neither created nor destroyed.
Lever
a simple machine made up of a bar that pivots at a fixed point.
Mass
the amount of matter in an object.
Mechanical advantage
a calculation of how much a machine multiplies force.
Mechanical digestion
the breaking of food into smaller pieces without changing it chemically.
Mechanical energy
the energy of motion used to do work.
Mechanical weathering
a process that breaks rock into smaller pieces by physical means without changing its chemical composition.
Model
a representation of an object, system, or process.
Motion
a change in an object’s position over time.
Net force
the sum of all the forces acting on an object.
Parallax
the apparent shift in the position of an object when viewed from two different places.
Phototropism
a plant’s growth response to light (plant growing towards light).
Physical change
a change that alters the form or appearance of a substance without changing the identity.
Position
an object’s location relative to a reference point.
Potential energy
energy an object has because of its position or composition
Pulley
a simple machine that consists of a rope or chain wrapped around a wheel.
Reference point
a stationary object against which motion is measured.
Screw
a simple machine that consists of an inclined plane wrapped around a cylinder.
Simple machine
a device that makes work easier by changing the size, direction, or both size and direction of the force used to do the work.
Temperature
a measure of the average kinetic energy of the particles in a substance.
Thermal energy
the energy of the moving particles that make up all matter.
Thigmotropism
a plant’s growth response to touch.
Unbalanced forces
forces that produce a net force other than zero (movement
Velocity
speed in a particular direction.
Wedge
a simple machine that consists of two inclined plans placed back to back.
Wheel and axle
a simple machine that consists of two circular objects of different sizes.
Work
the use of a force to move an object over a distance in the direction of the force.