Worksheets8th Grade Science Review
Total questions: 62
Worksheet time: 41mins
Which statement best explains the backward motion of the boat as the person moves forward?
Every mass exerts a force on every other mass
Friction opposes the motion of an object
For every action there is an equal but opposite reaction
According to Newton's Second Law of Motion, acceleration of an object depends on the mass of the object and the...
net weight of the object
gravity of the object
trajectory of the object
net force acting on the object
A push or pull that always acts on an object is called?
speed
motion
acceleration
force
An object is resting motionless on a surface. According to Newton's First Law, the object will only start to move if...
the net forces on the object equal zero
an unbalanced force is applied to the object
the upward force of the object is equal to its acceleration
two forces that are equal and opposite are applied to the object
Which statement best describes the differences between speed and velocity?
speed is the distance divided by time; velocity is total distance
speed is how fact an object is moving; velocity includes speed and direction
velocity is how fast an object is moving
Friction occurs because of...
the roughness of any object's surface
only the weights of any two objects
only the masses of any two objects
unbalanced forces
When a person pushes on a wall, why doesn't the wall fall over?
the wall cannot exert a force on anything
the wall is pushing back with same force
the wall is pulling on a person
the person pushing on the wall can't get enough friction
What is the purpose of using a parachute when skydiving?
to create an upward force of air resistance and slow down
to reduce the friction force and speed up
to go faster than terminal velocity
to balance out the forces and stop the skydiver from moving
Which of the following best describes friction?
a force that works against gravity
a form of energy that depends on light and heat
a force that opposes motion between two surfaces that are touching
a force that controls gravity
What can cause a moving object to increase its speed in a forward direction?
a force pushing on the object from the opposite direction
a force that continually acts on the object in the direction the object is moving
an increase in the mass of the object
a decrease in the force on the object
Use the graph to answer the following question. Between which two points is the speed the greatest?
A and B
B and C
D and E
E and F
Use the graph to answer the following question. Between which two points shows a negative acceleration?
A and B
B and C
D and E
E and F
Which of the following is a valid conclusion about ball B according to the data in the graph?
the ball is moving, but not accelerating
the ball's acceleration is positive and not constant
the ball's acceleration is negative and not constant
the all is moving with a negative acceleration
Which object has the most inertia?
a pencil being thrown across a room
a 15 pound bowling ball sitting on the floor
a school bus parked in the parking lot
a computer cart rolling down the hall
Two students are pushing a cart, as shown. In which direction and with what magnitude will the cart move?
50 N to the left
50 N to the right
350 N to the right
the cart will not move
A person sits in a chair with wheels. He pushes on a wall with his legs and applies a force directly to the wall. The push force causes an applied force in the opposite direction, as shown in the picture below. Which scientific principle best identifies why the person moves away from the wall?
the law of gravity
the principle of inertia
Newton's third law of motion
None of the above
If you slide a hockey puck on ice, it will eventually stop because of friction. Which law of motion is this?
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
If you use the same force to push a truck and push a car, the car will have more acceleration than the truck, because the car has less mass. Which law of motion is this?
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
How can the students' motion after the push best be explained?
The students move in opposite directions because the push results in an opposite force.
The students move in the same direction because the push results in two equal forces.
The students move toward each other because the students are sitting in similar chairs.
The students move away from each other because the students have similar weights.
What is the acceleration of an object with a mass of 5 kg with a net force of 20 N
0.25 m/s2
4 m/s2
25 m/s2
100 m/s2
A car travels 60 miles in 1 hour. The car travels faster between 0 and 20 minutes than between 40 and 60 minutes. Which graph most likely represents the motion of the car?
graph A
graph B
graph C
graph D
After the collision in each trial, puck J eventually comes to rest. Which statement best describes the results of the two trials?
Puck K speeds up from rest at the same rate in both Trial 1 and Trial 2.
Puck K speeds up from rest more quickly in Trial 2 than in Trial 1.
Puck K speeds up from rest more quickly in Trial 1 than in Trial 2.
Which diagram represents the object moving to the left?
Diagram A
Diagram B
Diagram C
Diagram D
Which ball will be moved the most by the force of the wind from the fan, and why?
Bowling ball; it has a much greater surface area than the tennis ball.
Tennis ball; it has a rough surface and deflects the wind better than the bowling ball.
Tennis ball; it has a much lower mass than the bowling ball.
What is Coach Oxley's favorite fast food?
McDonalds
Cookout
Chick-Fil-A
Taco Bell
Increasing the amplitude means you are increasing the _______________ of a wave.
frequency
amplitude
energy
wavelength
What is the wavelength?
length between crest to crest or trough to trough
the height of a wave
how fast the wave goes
the amount of times a wave passes through a certain point
What is the crest of a transverse wave?
the lowest point of the wave
the middle of a wave
the highest point of a wave
nothing
What is the amplitude of a wave?
how often a wave passes a certain point
the distance from the middle of the wave to a crest or a trough
the highest point of a wave
chick-fil-a
Which of the following properties makes a light wave different from all mechanical waves?
A light wave slows down in a vacuum.
A light wave is able to transmit energy.
A light wave exists as a transverse wave.
A light wave can travel without a medium.
Waves that need a medium are called?
Electromagnetic Waves
P-Waves
Mechanical Waves
Taco Bell
Waves that can travel through a vacuum and do no require a medium are called?
Transverse Waves
S-Waves
Mechanical Waves
Electromagnetic Waves
What is the visible light spectrum in order?
red, orange, yellow, green, blue, indigo, violet
orange, blue, green, yellow, red, violet, indigo
red, green blue, orange, violet, yellow, indigo
McDonald's is gross
The wavelength of a sound wave is 20m. The frequency is 5 Hz. What is the wave speed?
4 m/s
100 m/s
25 m/s
15 m/s
When a wave bounces back, it is called?
diffraction
refraction
transmission
reflection
What is the unit for frequency?
Meters
Hertz
Decibels
Meters/Second
When a wave spreads out, it is called____________________?
reflection
refraction
diffraction
absorption
Objects appear different in size and shape in a container of water due to ____________________________.
transmission
reflection
absorption
refraction
The electromagnetic waves with the highest frequencies are called?
radio waves
gamma rays
x-rays
visible light
The electromagnetic waves with the longest wavelengths are called?
radio waves
microwaves
gamma rays
x-rays
When the frequency of a wave decreases, the ____________________________________ of the wave increases.
wave speed
amplitude
wavelength
Doc McStuffins
How does a cell phone work?
cell phones transmit and receive signals using high-frequency microwaves
cell phones only receive signals from a cellular system
cell phones use frequency modulation
cell phones will use pulse modulation
