This material is blocking all light

This material you can clearly see though

This material allows only some light to pass through

Reflect means to:

A _________________________ is a curved lens that makes objects appear bigger. Examples include: telescope and magnifying glasses.

A _________________________ is a curved lens that makes objects appear smaller and farther away. Example: Side car mirror

The bending of a light wave as it passes from one substance to another is

A ping pong ball bouncing off a flat table is most like a light ray

Light waves move in _____________ lines

A change that carries energy from one place to another is?

A form of energy that travels as waves through matter and is produced when matter vibrates is

the distance between the resting point and a crest or trough of a wave is? (hint, is related to volume)

to move back and forth quickly is to

The distance between one crest or trough to the next crest or trough is called the

Sound travels through mediums. A medium for sound can be? Check all that are correct:

The _______________ of a sound is how high or low it is?

The _______________ is how loud or soft a sound is.

The higher the frequency of a wave, the higher the

When you strike thick long strings of a piano, you produce a ______________________ sound.

When you strike short, thin strings of a piano, you produce a ______________________ sound.

The greater the amplitude of a wave, the more energy the wave carries, and the _________________ the sound.

What causes a sound wave to form?

What should you change to lower the pitch of a sound wave?

Shortening the string between two cups will increase the volume.

Lengthening the string between two cups will increase the volume.

A string with more tension carries sound better than one with less tension.

What kind of simple machine makes it easier to raise an object by using a ramp?

Which type of simple machine is made up to two inlinced planes and is in the shape of a V?

A _____________ is made up of an inclined plane wrapped around a column and changes a weak circular force to a strong downward force?

A __________________ is made up of tow cylinders that turn on the same axis. Examples include steering wheels and doorknobs.

Seasaws and can openers are examples of a _______________, they are a stiff bar that moves freely around a fixed point called a fulcrum. These are used to help lift objects.

A ___________________ is made up of a rope fitted around the rim of a fixed wheel. These are used to raise and lower objects and to move things back and forth.

The force that pulls objects towards each other is called?

A force is ________________________.

This force slows and stops motion between two surfaces that are touching

This is the measure of speed in a certain direction

Green grass appears green because it

Apply a force to an object and you could change its:

Lenses in eyeglasses help people see better because they

Throw an apple into the air, and gravity will cause its motion to

Raising or lowering the cab of an elevator is a job for a

Ted is pushing a toy box across a carpeted floor. What would make the box travel more slowly?