Force
What is a force?
A push or pull on an object.
When force is applied to an object it can cause on object to do what? Give at least three answers
To start an object to move, speed up an object, change direction, or stop an object.
All sound is made by what?
Vibrations
Does sound travel through solid, liquid, or gas the fastest?
Solid
As light travels from one transparent material to another like air to water the light bends also known as what?
Refraction.
Paperclips being pulled toward a magnet is an example of a contact force or non-contact force?
Non-contact force.
What changes the motion of an object? Force or mass?
Force
What determines pitch?
In a high frequency wave, will the wave period be close together or far apart?
Close together
What object refracts light? (think about a rainbow).
A prism.
What is the difference between a contact and non-contact force?
A contact force requires physical touch while non-contact forces act over a distance through fields. Examples of non contact forces are gravity, magnetism, and electrotactic force.
A row boat is floating on the water with two passengers. the weight of the boat is pushing on the water and the water is exerting an upward force on the boat. What will happen if another passenger gets on the boat?
The boat will go lower in the water.
Sound waves are produced by what?
Vibration
If a sound is high-pitched and soft, the sound wave is what?
High frequency and low amplitude
If you wanted something to be cooler during the summer time what would be the best color to choose?
White or silver something that is reflecting the light away to keep you cooler. (To prevent heat and to stay cool you need a color or material that reflects light)
Describe what a contact force is.
A force that is applied to an object only when it is physically touching another object.
A train is moving along a track. If the forces acting on the train are balanced, how will its motion be affected.
The train will continue and be unchanged if the trains forces are balanced if the train is already moving.
Where is a place where sound waves could not be heard?
Outer space
What does a sound waves frequency determine?
How high the pitch is
If a flower is yellow what color would the flower be absorbing and what color/colors would the flower be reflecting?
Reflect yellow and absorb all other colors.
What does accelerate mean?
A change in an objects speed or direction. (Change in velocity)
You travel 159 miles in car in 3 hours. What is your speed in miles per hour?
53 miles per hour.
When sound waves bounce off things like walls and you hear something over and over it is called what?
An echo
When glasses are filled with different amounts of water and are tapped, what property of sound varies from glass to glass?
The pitch of the sound
Describe what opaque, translucent, and transparent is.
Opaque means no light gets through, translucent means some light gets through, and transparent means almost all light gets through.