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Q 1/53
Score 0
Which of these situations involves a decrease in chemical potential energy and an increase in kinetic energy?
30
A race car is refueled at a pit stop.
A phoneâs battery is being recharged.
A marble is released at the top of a ramp and accelerates toward the bottom.
A battery-powered toy car accelerates from rest.
Q 2/53
Score 0
Which is an example of the transfer of energy by a longitudinal wave?
30
A guitar string vibrates after being plucked.
A door slams, and someone in the next room hears the sound.
A large ocean wave knocks a person down.
S-waves cause the ground to move up and down during an earthquake.
53 questions
Q.
Which of these situations involves a decrease in chemical potential energy and an increase in kinetic energy?
1
30 sec
Q.
Which is an example of the transfer of energy by a longitudinal wave?
2
30 sec
Q.
A student tested three different brands of D-cell batteries using portable fans. The student placed a new battery in three identical fans to see how long each battery would last. The studentâs results are recorded in the table below. Which of the following statements is true about the energy of the battery-and-fan systems?
3
30 sec
Q.
A student makes a model airplane. Its propellor is connected to a rubber band. The student twists the rubber band many times. When the plane is launched, the rubber band unwinds, the propellor turns, and the plane flies. Which statement best describes the energy of the system as the rubber band unwinds?
4
30 sec
Q.
A hydroelectric power plant is located at the base of a dam. In the power plant, water flowing downhill spins turbines, causing a generator to produce electrical energy. Which best summarizes how the waterâs energy is used?
5
30 sec
Q.
Which statement does NOT apply to transverse waves?
6
30 sec
Q.
Examine the diagram of a swinging pendulum. To start its swinging, the pendulum was pulled up to Position A and then released. At which position(s) is the pendulumâs kinetic energy at a minimum and its gravitational potential energy at a maximum?
7
30 sec
Q.
Fill in the blank: In a wood biomass power plant, wood waste is burned. The resulting thermal energy heats water, producing steam. The steam causes turbines to spin. The spinning turbines run an electric generator. In this type of power plant, the _________________________ potential energy of the wood biomass is transferred to the water as thermal energy. This energy is transferred from the steam to the turbines as _____________________energy.
8
30 sec
Q.
Which is an example of energy being transferred by a wave?
9
30 sec
Q.
Why must there be many more producers than top consumers in a food web?
10
30 sec
Q.
Fill in the blank: In photosynthesis, ________ energy is transformed into ________ energy in the plant.
11
30 sec
Q.
Use the image to help answer the question.
During the process of photosynthesis, solar energy is used to produce:
12
30 sec
Q.
The diagram shows how a sound wave transfers sound energy from place to place. Which type of wave is a sound wave?
13
30 sec
Q.
Which is an example of energy being transferred by a longitudinal wave?
14
30 sec
Q.
What type of energy remains the same throughout a roller coaster ride?
15
30 sec
Q.
Whenever energy is transferred from one form to another in an electrical circuit, some energy is lost to what type of energy?
16
30 sec
Q.
When two bumper cars collide, how does the total energy of the two cars compare to the energy of the bumper cars before the collision?
17
30 sec
Q.
Fill in the blank: Sound is one kind of _____________________ wave. Sound is created when a source such as a guitar string or vocal cords _______________________ , transferring energy to particles such as air particles. The air particles collide with other air particles. These collisions create a wave that moves away from the source. The wave is made up of lower-pressure areas called rarefactions and higher-pressure areas called _________________________.
18
30 sec
Q.
What does the gravitational force between two objects depend on?
19
30 sec
Q.
Two forces acting on an object are modeled in the diagram below. Which best describes the forces modeled by the diagram?
20
30 sec
Q.
A group of physics students went bowling and were asked to identify Newtonâs Laws as they bowled. What represents Newtonâs 3rd Law?
21
30 sec
Q.
Which of the following is the best example of friction?
22
30 sec
Q.
A helicopter uses Newtonâs Third Law to fly. As the propeller spins, air is pushed _____________________, causing the helicopter to lift ______________________
23
30 sec
Q.
A student is filling in the following table to communicate the results of their research.
The student identifies all of the forces as contact forces. Which answer and explanation of the answer is correct?
24
30 sec
Q.
The diagram shows a 15â˘kg block on the table attached by a rope to a 10 kg block that is hanging off the table by a pulley attached to the table.
What force is being reduced by the pulley in this system?
25
30 sec
Q.
A box on wheels has forces acting on it: 15 N and 10 N pushing to the right, 25 N pushing to the left, 5 N downward, and 5 N upward.
Is this an example of a balanced or unbalanced force?
26
30 sec
Q.
Which of the four diagrams below shows unbalanced forces with a net force of 7 N downward?
27
30 sec
Q.
The speed of 30 runners were tested with and without starting blocks when running a 50 âmeter dash. They ran only one race a day so that being tired did not affect their results. The averages were then calculated and recorded. Use both the images and the data table to answer the question.
How can paired forces be used to explain the results of the races?
28
30 sec
Q.
This table shows the horizontal forces acting on large boulder being dragged by a team of horses. Which best describes the forces acting in a horizontal direction?
29
30 sec
Q.
Which best describes the forces acting on a person with a weight of 650 N standing on the floor?
30
30 sec
Q.
The following data table shows vertical forces acting on objects. Which best describes the forces acting on Object 1?
31
30 sec
Q.
A student examines the following diagram that shows a couch being pushed across the floor.
Which describes the net motion of the couch?
32
30 sec
Q.
The forces modeled in the diagram below are ________________________.. The magnitude of the net force is _________________________. and it is acting in a(n) ___________________direction.
33
30 sec
Q.
A golfer hits a golf ball from a grassy hill into a sand trap 50 meters away. What are a pair of forces acting in equal and opposite direction in this example?
34
30 sec
Q.
The diagram shows a 15â˘kg block on the table attached by a rope to a 10 kg block that is hanging off the table by a pulley attached to the table.
35
30 sec
Q.
What force pair in this image is equal in magnitude and opposite in direction?
36
30 sec
Q.
Which of the four diagrams below shows unbalanced forces with a net force of 10 N to the right?
37
30 sec
Q.
Which statement is NOT true?
38
30 sec
Q.
Four students are carrying out different experiments as shown in the table.
Which of the students' experiments should NOT result in a chemical change?
39
30 sec
Q.
Which of the following is NOT a chemical change?
40
30 sec
Q.
Which statement about the mixtures is NOT correct?
41
30 sec
Q.
Which of the following substances is a homogeneous mixture?
42
30 sec
Q.
What type of matter is shown in the photo?
43
30 sec
Q.
The diagram shows four ways to warm up your hands.
Which way of warming up your hands is evidence of a chemical change?
44
30 sec
Q.
Antacid tablets are taken to reduce stomach acids caused by heartburn. As the diagram shows, when an antacid tablet is added to a glass of water, it is effervescent (of a liquid giving off bubbles; fizzy) .
Which of the following statements describes why this is a chemical change?
45
30 sec
Q.
Which are the two types of pure substances?
46
30 sec
Q.
Which table compares homogeneous and heterogeneous mixtures correctly?
47
30 sec
Q.
A student combines vinegar and baking soda. The results are shown in the photo.
What evidence is there that a chemical change occurred?
48
30 sec
Q.
Which of the following is NOT evidence of a chemical change?
49
30 sec
Q.
Fill in the blank: A scientist wishes to separate a heterogeneous mixture of water and metal filings. Two ways that the scientist could separate the components of the mixture are by _______________________ and _______________________________.
50
30 sec
Q.
Which of the following is an example of a chemical change?
51
30 sec
Q.
Criminal investigators use a compound named luminol to detect blood in crime scenes. Luminol reacts to blood and produces light. Investigators spray luminol where they suspect there is blood, turn off the lights and observe if there is a blue glow. This process is called chemiluminiscence.
Which statement explains chemiluminiscence correctly?
52
30 sec
Q.
A student carried out four experiments combining a solid and a liquid. The table summarizes the liquids and the solids that were mixed and their observations.
Which observation is most likely to have been caused by a chemical change?
