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BJHS Science Sem1

QuestionAnswer
The bending of light rays as they enter a new medium is called refraction
To determine the acceleration rate of an object, you must calculate the change in speed during each unit of time
Speed equals distance divided by time
The SI (metric) unit for force is the Newton
A place or object used for comparison to determine if something is in motion is called a reference point
If you know the distance an object has traveled in a certain amount of time, you can determine the speed of the object
Air resistance is a type of friction
Which term refers to how high or low a sound seems to a person? pitch
The tendency of an object to resist change in its motion is known as inertia
When an object’s distance from another object is changing, it is in motion.
Forces can be added together only if they are acting on the same object
The amount of matter in an object is called its mass
Waves that move the particles of the medium parallel to the direction in which the waves are traveling are called longitudinal waves.
When the surface of a mirror curves inward, like the inside of a bowl, it is called a concave
If speed is measured in kilometers per hour and time is measured in hours, the unit of acceleration is kilometers per hour per hour
In an acceleration graph showing speed versus time, a straight line shows the acceleration is constant
Sound is a disturbance that travels through a medium as a longitudinal wave
Frequency is measured in units called Hertz
According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail exerts an equal force back on the hammer
What color would a tomato look under blue light? black
What happens when light passes from air into water? The light slows down
The rate at which velocity changes is called acceleration
In physical science, a push or a pull is called a(n) force
The maximum distance that the particles of a medium move from the rest position is the amplitude of the wave
One way to increase acceleration is by decreasing mass (or increase force)
The primary colors of light are red, green, and blue
You can hear sounds from around corners because of diffraction
When you know both the speed and direction of an object’s motion, you know the velocity of the object
What occurs when vibrations traveling through an object match the object’s natural frequency? resonance
Changing direction is an example of a kind of acceleration
The achievement of lifting a rocket off the ground and into space can be explained by Newton's Third Law- For every action, there is an equal and opposite reaction.
The electromagnetic waves with the highest frequencies are called gamma rays
Loudness, or sound level, is measured in units called decibels
What happens when parallel rays of light hit a smooth surface? regular reflection
The bending of waves due to a change in speed is called refraction
The product of an object’s mass and velocity is called its momentum
What do some bats use to locate food and to navigate? echolocation
Which of the following is the correct equation for acceleration? final speed - initial speed / time
Electromagnetic waves can transfer energy without a(n) medium
This is an example of increasing friction intentionally. throwing sand on an icy driveway
You can show the motion of an object on a line graph in which you plot distance against time
What is transferred by electromagnetic waves? electromagnetic radiation
The speed of a wave is its wavelength multiplied by its frequency
What is an example of exerting a force? hammering a nail, pulling a rope, slapping a table are all examples of exerting force
A curved piece of glass or other transparent material that is used to refract light is called a(n) lens
What is required for a rocket to lift off into space? thrust that is greater than Earth’s gravity
If the speed of an object does NOT change, the object is traveling at a constant speed
The range of electromagnetic waves placed in a certain order is called the electromagnetic spectrum
What happens when two forces act in the same direction? They add together
Average speed is calculated by dividing the total distance traveled by the total time
The force that one surface exerts on another when the two rub against each other is called friction
On a graph showing distance versus time, a horizontal line represents an object that is not moving at all.
When a wave hits a surface through which it CANNOT pass and bounces back, it undergoes reflection
Mechanical waves are created when a source of energy causes a medium to vibrate
The changing pitch of a police car’s siren as it moves by you is an example of the Doppler effect
The interaction between two waves that meet is called interference
Refraction occurs when a wave enters a new medium at an angle
The distance between two corresponding parts of a wave is the wave’s wavelength
The pitch of a sound that you hear depends on the sound wave’s frequency
The moon accelerates because it is continuously changing direction
If a bicyclist travels 30 kilometers in two hours, her average speed is 15 km/h
Which waves have some electrical properties and some magnetic properties? electromagnetic waves
If you know a car traveled 300 kilometers in 3 hours, you can find its average speed
The bending of waves around the edge of a barrier is known as diffraction
A disturbance that transfers energy from place to place is called a wave
Objects falling through air experience a type of friction called air resistance
Doctors are able to make sonograms through the use of ultrasound
The highest parts of a transverse wave are called crests
Any force that causes an object to move in a circle is called a(n) centripetal force
How can you increase the momentum of an object? by increasing its mass
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