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Balance and Motion. Investigation 1: Balance. arch. A curved shape. balance. To stay in a position without being held. balance point. The place on which an object balances. clothespin. A clip of wood or plastic for fastening clothes on a clothesline. counterweight.

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Balance and Motion

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Balance and Motion


Investigation 1: Balance


arch

A curved shape.


balance

To stay in a position without being held.


balance point

The place on which an object balances.


clothespin

A clip of wood or plastic for fastening clothes on a clothesline.


counterweight

Something that helps to balance an object.


crayfish

A freshwater shellfish.


mobile

A system of balance beams and objects.


object

Anything that can be seen or touched; a thing.


position

The place where a person or thing is.


stable

Steady; not falling over.


system

A set of objects that are related in some way and can be isolated for study; a group of things or parts that form a whole.


triangle

A three-sided shape.


unstable

When something is not steady and falls over.


weight

How heavy something is.


wire

A bendable metallic strand or rod.


Investigation 2: Spinners


air resistance

The force of air pushing on something.


axis

A straight line around which something rotates.


disk

An object that is a circle in only one direction and can fall over; a disk can be a wheel.


knot

To firmly tie two pieces of material together.


motion

The act of moving.

When something moves.


rotate

To turn in circles a lot of times; to spin.


shaft

Something that acts as an axis.


spin

To turn by turning around an axis.

To turn in circles a lot of times; to rotate.


swirl

To spin or twist around and around.


top

A toy that spins.


twirl

To spin in the air.


twirler

A flying spinner.


twist

To wind or turn something around.


whirl

To move or turn around quickly or suddenly.


wing

The moveable appendages that birds and other animals use to fly.


zoomer

A toy made from a plastic disk and a piece of string; it spins around when tension is released from the twisted string.


Investigation 3: Rollers


axle

A rod or shaft to which wheels can be attached.


loop

An opening that is made by curving a piece of material into a circle.


ramp

An object that has a slope.


runway

A path over which something moves or lands.


slope

A surface that is higher on one end.


sphere

An object that is round in all directions and rolls in all directions.


spiral

To move in a circular motion around a fixed center point.


wheel

An object that is a circle in only one direction and can fall over; a wheel is a disk.


Science Stories


force

A push or a pull.


gravity

A force that pulls things toward the Earth.


pitch

How high or low a sound is.


roll

To move by turning over and over.

When a wheel goes around on its edge.


stable position

Steady, not falling over.


vibration

A fast back and forth motion. Vibration makes sound.


volume

How loud or soft a sound is.


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