physical science
The escaping water exerts an equal and opposite force on the hose.
A firefighter feels the hose pushing backwards onto him as he uses it to put out a fire. What is the most likely cause of this?
A glass prism is able to bend light because
A glass prism is able to bend light because
balanced forces
A group of students is playing tug-of-war. The students on both sides of the rope are pulling with equal force so that the rope is not moving. This is an example of ______.
800 N up
A man weighing 800 N is standing on a chair. In order to support the man, what force is the chair exerting?
-6 m/s ^2
A skateboarder is traveling 12 m/s down a hill. The skateboarder crashed and slid to a stop in 2.0 seconds. What was the rider's acceleration?
travel at 300,000,000 m/s
All electromagnetic waves _______.
the new planet has more gravity than Earth
An astronaut is planning a trip to a newly-discovered planet. According to the Law of Universal Gravitation, the astronaut's weight on the new planet will be greater than his weight on Earth if:
reflection
An echo is an example of sound wave
zero
An object moving at a constant velocity will have acceleration that is...
speeds up, slows down, changes direction
An object undergoes acceleration (non-zero) when it_____
Microwaves have a linger wavelength than UV light
Based on the electromagnetic spectrum above, what is the difference between Microwaves and Ultraviolet light?
0; Balanced
Calculate the net force acting on the object and determine if the forces are balanced or unbalanced.
8.0 m/s^2
Find the acceleration of a car that goes from 32 m/s to 96 m/s in 8.0 s
15 m/s^2
Find the acceleration of the bicyclist in the graph from 5 s to 6 s.
3
How many wavelengths are there in the picture?
5
If a car increases its velocity from zero to 50 m/s in 10 seconds, its acceleration is ______m/s^2.
25 degrees
If the angle of reflection is 25 degrees, the angle of incidence is
bounce off
In order for reflection to occur, the wave must ___________an object.
has zero acceleration
In this velocity vs. time graph, the person at point B ____
has negative accceleration
In this velocity vs. time graph, the person at point C
West
Jack and Jill are pushing a dresser cross their bedroom in the direction of East. The direction of the force of friction is
empty space
Light waves travel the fastest in ________ .
speed
Refraction occurs when a wave changes its __________ as it passes through a different medium.
1.a bike moving at a constant speed around a circular track 2. a toy car rolling faster down a ramp 3. truck slowly speeding up after being stopped at a spotlight
Select three situations in which unbalanced forces are acting on the objects.
a vacuum
Sound waves are unable to travel through —
a solid
Sound waves travel the fastest in_______.
Roll three marbles across three different surfaces from the same starting point at the same time and with the same amount of force.
Students conduct experiments to investigate friction. Which experiment will best test the effect of friction on objects?
diffraction
The bending of light waves as they bend around an object is called _______.
4 m/s^2
The graph shows how the velocity of a car changes over time.
A
The graph to the right represents the change in velocity of four cars over a period of 10 hours. Which line represents the car with the greatest acceleration?
B
The graph to the right represents the motion of four cars on a straight road. Which car has zero acceleration?
the direction of the horses' motion is constantly changing
The horses on a carousel or merry-go-round are accelerating because ____
refraction
The picture to the shows which wave behavior?
masses and the distance between them
The size of the gravitational force between two objects depends on their ____ .
velocity, time
The two quantities necessary for calculating acceleration are
air resistance
The upward force on an object falling through the air is ____ .
Mechanical wave
This type of wave NEEDS a medium to transmit energy.
Electromagnetic wave
This type of wave does NOT need a medium to transmit energy.
amplitude
Wave A carries more energy than wave B. Wave B must have a smaller_________ than wave A
the product of mass and velocity
What determines the momentum of an object?
medium
What is the matter through which a wave travels through called?
1,000 kg x m/s
What is the momentum of a 50 kg object traveling with a constant velocity of 20 m/s?
0
What is the momentum of a 750-kg Volkswagen Beetle when at rest?
2 N to the left
What is the net force on the block in the picture?
250 m/s
What is the velocity of a wave having a frequency of 25 Hz and a wavelength of 10 m?
ultraviolet waves
Which electromagnetic wave comes from the sun to give you Vitamin D?
speed
Which is an example of a compressional wave?
m/s^2
Which measurement is a unit of acceleration?
Weight is a constant no matter where you are located
Which statement below is FALSE?
The truck because it has a larger mass
Which will have a larger momentum when moving at the same speed: a 2,000-kg truck or a 1,000-kg sedan?
