Question 1

The graph shows the distance an object travels over time. Which answer correctly describes the object's motion during each interval of time?

Accepted Answer

https://uploads.quizalize.com/2e5d96de-6972-4ba4-9f57-b77e15c65cec/question/6fe1bb0bc76a64e12cb821fd164689a399ba5365.png

Answer

https://uploads.quizalize.com/2e5d96de-6972-4ba4-9f57-b77e15c65cec/question/b2fcde5a2acbf87e21825fc9d12a97591705a1c3.png

Answer

https://uploads.quizalize.com/2e5d96de-6972-4ba4-9f57-b77e15c65cec/question/3f534d6bf9c78fa4ad4c154a48702085f77bf5c2.png

Answer

https://uploads.quizalize.com/2e5d96de-6972-4ba4-9f57-b77e15c65cec/question/a333b0cc97a873549c4cf338b64b67bc4552f7e4.png

Question 2

In which time interval was the object speeding up?

Accepted Answer

between 0 s and 2 s

Answer

between 8 s and 10 s

Answer

between 6 s and 8 s

Answer

between 2 s and 4 s

Question 3

Hector went to the grocery store by heading due north at 3 m/s, then turning east and continuing at the same speed for another three blocks. Which of the following is true about Hector's velocity?

Accepted Answer

Hector's velocity changed because his direction changed.

Answer

Hector's velocity did not change because his direction did not change.

Answer

Hector's velocity changed because his speed changed.

Answer

Hector's velocity did not change because his speed did not change.

Question 4

A train rolls to a stop along a horizontal track without the conductor applying the brakes. What answer choice BEST explains why this occurred?

Accepted Answer

The opposing force of friction stopped the train.

Answer

The train ran out of momentum.

Answer

The force of gravity slowed the train until it stopped.

Answer

The natural state of the train is not to be in motion.

Question 5

The Smith family is traveling in their car at 50 km/h due east. Mr. Smith is using cruise control to maintain a constant speed. Describe the net force acting on the Smith car.

Accepted Answer

Net force equals zero.

Answer

Net forces are unbalanced.

Answer

Net force is positive and to the east.

Answer

There is no way to determine net force.

Question 6

Brad and Erin decide to have a tug of war contest. Erin pulls the rope with all her might and so does Brad. Sadly, Brad only pulls with half the force that Erin pulls with.

Since the forces are unbalanced the rope will move towards Erin. Using Newton's first law of motion as a model, explain how Brad could keep from losing the tug of war.

Accepted Answer

Let Sarah, who pulls just as hard as Brad, team up with him to pull the rope together.

Answer

Make the rope longer so Brad can get a better grip.

Answer

Ask Erin to let go of the rope.

Answer

Let Sarah, who pulls just as hard as Brad, team up with Erin to pull the rope together.

Question 7

Your teacher was given an apple by a student trying to get on her good side. It sits on her desk the whole year, not moving.

You know that, if the apple were to roll off the desk, it would fall to the ground. So what is keeping the apple motionless on the desk?

Accepted Answer

The downward force of gravity on the apple is balanced by an equal but opposite force on the apple by the desk.

Answer

The downward force of gravity on the apple is balanced by an equal but opposite force on the apple by the teacher.

Answer

The downward force of gravity on the apple is balanced by a larger force on the apple by the desk.

Answer

Once placed on the desk, gravity is no longer acting on the apple.

Question 8

The image above shows two opposite forces acting on a rolling cart, what can we say is true about the effect of the forces on the cart?

Accepted Answer

The forces are unbalanced, and net force on the cart moves it to the left.

Answer

It cannot be determined because one man is taller than the other.

Answer

It cannot be determined without knowing which man is stronger.

Answer

The forces are unbalanced, and net force on the cart moves it to the right.

Question 9

Consider the four free-body diagrams. Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation. Do any of the free-body diagrams indicate motion? If yes, which one(s). Explain.

Accepted Answer

Yes. In B and D. In both cases, there is a net force.

In B, there is a net force to the left; in D there is a net force upward.

Answer

No. In each case, the forces are balanced.

Answer

You cannot tell if there is any motion. You can only determine how much force is acting on the objects.

Answer

Yes. In B the book is slowing down because of the friction force opposing motion.

Question 10

Imagine you are on the top of a mountain with four basketballs. The mass of the four basketballs are 100 kilograms, 200 kilograms, 300 kilograms, and 400 kilograms. If the basketballs rolled down the hill, which one would supply the greatest force at the bottom of the mountain (assuming that their velocities were equal at the bottom of the mountain)?

Accepted Answer

400 kilogram basketball

Answer

100 kilogram basketball

Answer

300 kilogram basketball

Answer

200 kilogram basketball

Question 11

Mutt and Jeff are running along a path each pushing a cart loaded with rocks. If Mutt's wagon has a mass two times greater than Jeff's and they want to stay together, arriving at their destination at the same time, what must happen?

Accepted Answer

Mutt must use twice as much force to push his cart.

Answer

Jeff should slow down so Mutt can catch up.

Answer

Mutt and Jeff will use the same force, but Mutt will take bigger steps.

Answer

Mutt must use half as much force to push his cart.

Question 12

Meg and Rachel each have bowling balls with the same mass. They both roll them as hard as they can and then measure the speed of the balls.

Meg's ball and Rachel's ball were measured to have the exact same speed.

What do you know about the forces applied by the girls?

Accepted Answer

They applied an equal amount of force.

Answer

Rachel applied more force than Meg.

Answer

Meg applied more force than Rachel.

Answer

They applied almost the same amount of force.

Question 13

Kimberly, Alex, and Fernando built small sailboats in science class. Their boats have the following weights:

Kimberly: 150 grams

Alex: 175 grams

Fernando: 200 grams

Think about how much force is needed to move each boat. Which correctly lists the boats in order from the most to least amount of force needed to move them?

Accepted Answer

Fernando, Alex, Kimberly

Answer

Alex, Kimberly, Fernando

Answer

Kimberly, Alex, Fernando

Answer

Kimberly, Fernando, Alex

Question 14

It takes more force to accelerate the Iron Man on the left than the Iron Man on the right because the Iron Man on the left has more mass. This best describes

Accepted Answer

Newton's second law, the law of acceleration

Answer

Newton's third law, the law of action-reaction

Answer

Newton's first law, the law of inertia

Answer

The law of universal gravitation

Question 15

An automobile you are riding in suddenly stops, but you continue to go forward.

Accepted Answer

Newton's 1st Law

Answer

Newton's 2nd Law

Answer

Newton's 3rd Law

Answer

Gravitational Force

Question 16

Calculate the Net Force.

Accepted Answer

60N, Right

Answer

0N

Answer

60N, Left

Answer

40N, Right

Question 17

Why is the following chemical equation not balanced? H_{2 +}O₂--> H₂O

Accepted Answer

each side of the equation has a different number of oxygen atoms

Answer

each side has the same mass

Answer

This equation is balanced

Answer

each side of the equation has a different number of hydrogen atoms

Question 18

Which would increase an object's temperature?

Accepted Answer

increasing the kinetic energy of the particles in the object

Answer

increasing the mechanical energy of the object

Answer

slowing down the particles in the object

Answer

placing the object on top of another object that has less thermal energy

Question 19

Maria and Carla were hiking when Maria tripped, fell, and sprained her ankle. Carla took out the first-aid kit and unwrapped a cold pack. Carla popped a vial that was inside the cold pack. The pack began to get icy cold and Carla applied the pack to Maria's ankle. What kind of reaction occurred in the cold pack? What evidence supports your answer?

Accepted Answer

It is a chemical change because heat energy is absorbed and the pack gets colder.

Answer

It is a physical change because the substance in the vial dissolved in the pack's liquid

Answer

It is a physical change as evidenced by a drop in temperature.

Answer

It is a chemical change because two different chemicals are mixed together.

Question 20

When she dropped a rock into a graduated cylinder of water, Veronica noticed it sank to the bottom. She decided to investigate what it would do if she tossed it into a much larger amount of water. When she tossed it into a lake, the rock sank again. Which statement best explained why this happened?

Accepted Answer

The density of a substance is the same regardless of the amount.

Answer

The lake had become less dense because of heavy rains in the past month.

Answer

An object's density changes based on the amount of substance in which it is submerged.

Answer

The rock was already wet from being submerged in the graduated cylinder of water.

Question 21

Arrange the substances [SUN, TREE. NEON GAS, LEMONADE] in the table from the MOST to the LEAST ordered particle arrangement.

Accepted Answer

Tree, Lemonade, Neon Gas, Sun

Answer

Lemonade, Neon Gas, Tree, Sun

Answer

Neon Gas, Sun, Lemonade, Tree

Answer

Lemonade, Tree, Sun, Neon Gas

Question 22

Valeria placed batteries in her remote control used to control the television. Which of the following explains how the batteries are used to power a remote control?

Accepted Answer

There is chemical energy that is creating chemical reactions in the remote control, and it is transforming into electrical energy that is used to power the remote control.

Answer

There are chemical reactions create electrical energy in the remote that is transformed into thermal energy that is used to power the remote.

Answer

There are chemical reactions in the batteries that create electrical energy in the remote control that is transformed into light energy that is used to power the remote-control.

Answer

The chemical reactions in the batteries are creating electrical energy that is transformed into chemical energy that is used to give the remote control power.

Question 23

A cubic box with a mass of 10N falls from Position “a” to the ground at Position “c”. Which statement describes the transformation of energy in the diagram?

Accepted Answer

Potential energy at Position “a” is the greatest, but kinetic energy changes as the height changes.

Answer

Potential energy at Position “c” is the greatest, but kinetic energy changes as the height changes.

Answer

Kinetic energy at Position “a” is the greatest, but potential energy changes as the height changes.

Answer

Kinetic energy at Position “c” is the lowest, but potential energy changes as the height changes.

Question 24

Which statement best describes the arrangement of elements in the periodic table?

Accepted Answer

Elements are arranged in increasing atomic number from left to right

Answer

Elements are arranged in decreasing atomic number from left to right.

Answer

Elements are arranged in decreasing atomic mass from left to right.

Answer

Elements are arranged in increasing number of neutrons from left to right.

Question 25

Billy pushes a supermarket cart with a constant force F . Every time he adds groceries to the cart, the weight of the cart increases. Billy adds groceries until the cart is filled.

How do the groceries affect the cart's acceleration if the force Billy uses to push the filled cart is the same force he used to push the empty cart?

Accepted Answer

The increased weight decreases the acceleration.

Answer

The increased weight causes the acceleration to become zero.

Answer

The increased weight causes no change in the acceleration.

Answer

The increased weight increases the acceleration.

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