Quiz about 8.6C

Question 1

Q phtograph of a bird perched on a fence post is shown.

Which description best identifies the action/reaction pair between the bird and the fence post?

Accepted Answer

Action: The force of the bird on the fence post

Reaction: The force of the fence post on the bird

Answer

Action: The force of the bird on the wires

Reaction: The force of the wires on the fence post

Answer

Action: The force of the wires on the fence post

Reaction: The force of the fence post on the bird

Answer

Action: The force of the fence post on the bird

Reaction: The force of the bird on the wires

Question 2

A roller coaster containing three cars is accelerating at 10 m/s² before it comes to an abrupt stop at the end of the ride. The mass of one car is 300 kg.

How much force was exerted on the roller coaster to bring it to a stop?

Accepted Answer

9000 N

Answer

30 N

Answer

900 N

Answer

3000 N

Question 3

During a tug-of-war competition, neither team is able to gain an advantage. Which of the following explains the forces in this situation?

Accepted Answer

The forces are balanced.

Answer

The forces are overcome by air friction.

Answer

The mass of the rope cancels the forces being exerted on it.

Answer

The forces are unbalanced.

Question 4

A rocket is traveling from Earth to Mars at 10,000 m/s. If no outside force is applied to it, what will happen to its speed over the course of the trip?

Accepted Answer

Stay constant

Answer

Speed up

Answer

Slow down

Answer

Changes depending on mass

Question 5

You are riding in a vehicle with a coffee cup on the dashboard while traveling 30 km/h. The vehicle makes a sudden stop to avoid hitting the car that has stopped in front of it.

Which illustration best demonstrates what would happen to the coffee cup?

Accepted Answer

Question 6

A 62 kg wake boarder is being pulled by a boat with a force of 124 N. What is the acceleration of the wake boarder?

Accepted Answer

2 m/s2

Answer

0.5 m/s2

Answer

5 m/s2

Answer

0.2 m/s2

Question 7

The masses of four bowling balls, and the net forces acting on them as they approach the pins at the end of the lane, are recorded in the table below.

Which bowling ball has the greatest acceleration as it approaches the pins at the end of the lane?

Accepted Answer

The red ball

Answer

The green ball

Answer

The pink ball

Answer

The purple ball

Question 8

Two vehicles with different masses are traveling 104 kilometers per hour on a highway. As each vehicle approached a traffic light, it turned red. Each car applied their brakes at the same time and applied the same amount of force to stop.

Which statement below best describes what happened?

Accepted Answer

The vehicle with the larger mass took longer to stop than the vehicle with the smaller
mass.

Answer

The vehicle with the smaller mass took longer to stop than the vehicle with the larger
mass.

Answer

The vehicle with the smaller mass has more inertia than the vehicle with the larger mass.

Answer

The vehicle with the larger mass took less force to stop than the vehicle with the smaller
mass.

Question 9

A group of four students is participating in a marble race. Each marble has a different mass, and the same force is applied to each marble.

Which marble will experience the least acceleration?

Accepted Answer

Marble D

Answer

Marble A

Answer

Marble B

Answer

Marble C

Question 10

Students roll a 6.5 g toy car down a 75 cm ramp covered with different textures. The students conduct three trials for each texture. The students use the table below to record their data.

Which of the following questions is most likely being investigated based on the description above?

Accepted Answer

How does the texture of a surface affect the amount of frictional force applied to an object traveling across the surface?

Answer

How long does it take for a toy car to travel down a ramp?

Answer

How does the length of a ramp affect the amount of time it takes for a toy car to travel down a ramp?

Answer

How does the mass of a car affect the amount of time it takes a toy car to travel down a ramp?

Question 11

The diagram below models two tectonic plates sliding past one another. This type of plate movement is common with oceanic plates. As the plates push against one another, pressure builds up in the form of tension. All of the tension is released when the plates begin to move.

According to the information and diagram above, which force is responsible for the plate movement?

Accepted Answer

Unbalanced

Answer

Balanced

Answer

Gravitational

Answer

Frictional

Question 12

Magician's Table Trick

Refer to the image above. A magician performs a trick where the tablecloth is quickly removed from the table, while all of the items on the table stay in the same place. Which statement below accurately describes the reason that the items remain on the table?

Accepted Answer

The moving tablecloth did not apply much force to the items on the table, so the forces on the items remained mostly balanced allowing the items to remain at rest on the table.

Answer

The action force of the moving tablecloth caused a reaction force from the items on the table, so the forces in the items remained balanced and the items remained at rest on the table.

Answer

The direction of the force applied to the tablecloth was down towards the ground, so the items accelerated down towards the table until they rested on the table.

Answer

The mass of the items on the table is so small that no force was applied when the tablecloth was pulled out from under the items.

Question 13

Which of the following scenarios where a ball is in motion describes balanced forces?

Select all that apply.

Accepted Answer

2

Accepted Answer

5

Answer

1

Answer

3

Answer

4

Question 14

Four tractor trailers are entering a highway. Their masses and net force are recorded below.

Which tractor trailer will have the greatest acceleration when entering the highway?

Accepted Answer

Tractor Trailer 4 because the mass is less and the force is greater compared to other tractor trailers

Answer

Tractor Trailer 1 because the mass and force are less compared to other tractor trailers

Answer

Tractor Trailer 2 because the mass and force are greater compared to other tractor trailers

Answer

Tractor Trailer 3 because the mass is greater and the force is less compared to other tractor trailers

Question 15

According to the information and diagram above, how much acceleration is affecting the 2 kg mass?

Accepted Answer

4.95 m/s2

Answer

9.9 N

Answer

19.8 m/s2

Answer

19.8 N

Question 16

Refer to the information and diagram shown above. If the object is NOT moving, where is the acceleration coming from to cause the force on the mass?

Accepted Answer

Gravity

Answer

Friction

Answer

Spin of Earth

Answer

Movement around Sun

Question 17

Observe the illustration above. If the student fell off of the skateboard in the direction indicated, which arrow indicates the most likely direction the skateboard would travel based on the law of action-reaction?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 18

The diagram below shows the different forces acting on a toy rocket.

The total mass of the rocket is 0.5 kg. Based on the information above, what is the acceleration of the rocket?

Accepted Answer

14 m/s2

Answer

6 m/s2

Answer

30 m/s2

Answer

46 m/s2

Question 19

Students designed and built model cars and then raced down a ramp. They recorded the mass and acceleration of each car in the table below.

Which of the four cars had the least net force applied to it when it was launched down the ramp?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 20

The image models the process of Pangea breaking up into modern day continents.

Which of the following best explains why Pangea broke apart into modern day continents?

Accepted Answer

The plates underlying the continents were already in motion.

Answer

Earthquakes and volcanoes formed between the continents.

Answer

Changing climate caused ice to form between the plates.

Answer

Balanced forces caused a change in the motion of the plates.

Question 21

A plastic tube is arranged on a lab tabletop as shown. A small sphere enters one end of the tube with enough speed to come out the other end of the tube.

Which diagram shows where the sphere will go first when it leaves the tube?

Accepted Answer

Question 22

A researcher observes a car speeding up from rest. The researcher records data about the car and the car's motion.

Which data points can be used to calculate the net force that was acting on the car when it was speeding up?

Select TWO correct answers.

Accepted Answer

The car's mass is 1,000 kg.

Accepted Answer

The car's acceleration was 4 m/s².

Answer

The car's speed increased for 7 seconds.

Answer

The car started from rest.

Answer

The car traveled a total of 300 m.

Question 23

During a lab investigation, students added four 50 g masses to two boxes and arranged the boxes so that they were motionless on a pulley, as shown in the diagram. The students then followed the procedure described in the box. The students recorded their observations after each procedure and reset the pulley system to the original conditions.

During which of the procedures did students observe an unbalanced upward force on Box 1?

Select TWO correct answers.

Accepted Answer

Procedure 4

Accepted Answer

Procedure 5

Answer

Procedure 1

Answer

Procedure 2

Answer

Procedure 3

Question 24

When a coin is tossed in the air, it travels upward, gradually slows down, momentarily reaches zero speed, then moves back downward with increasing speed. Which statement best explains this change in the coin's motion?

Accepted Answer

The force of gravity causes the coin to change its velocity.

Answer

The coin's inertia decreases on the way up and increases on the way down.

Answer

The action-reaction force pair of gravity and the applied force cancel each other.

Answer

The coin remains in its state of upward motion until the force of friction acts upon it.

Question 25

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

Accepted Answer

The forces acting on the rock are all balanced.

Answer

There are no forces acting on the rock.

Answer

The only force acting on the rock is directed toward the sidewalk.

Answer

The sidewalk exerts an unbalanced force on the rock.

Question 26

A pitcher throws a ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10-newton force to the ball.

Which statement correctly describes the reaction force between the bat and ball?

Accepted Answer

The reaction force is the force of the ball on the bat.

Answer

The reaction force is the force that causes the ball to move toward the bat.

Answer

The reaction force is the force applied to the bat by the player holding the bat.

Answer

The reaction force is the force that pulls the ball toward the ground.

Question 27

Four boxes are sliding with constant speed before each box experiences an unbalanced force of 8 N. Which box would experience the greatest acceleration when the unbalanced force is applied?

Accepted Answer

The box with a mass of 2 kg

Answer

The box with a mass of 4 kg

Answer

The box with a mass of 6 kg

Answer

The box with a mass of 8 kg

Question 28

Two forces are applied to a 17 kg box, as shown. The box is on a smooth surface.

Which statement best describes the acceleration of the box?

Accepted Answer

The box accelerates at 1.0 m/s² to the right because the net force is 17 N to the right.

Answer

The box accelerates at 1.9 m/s² to the right because the greater force is to the right.

Answer

The box accelerates at 3.0 m/s² because the combined forces cause the box to accelerate.

Answer

The box does not accelerate, because neither force is large enough to move the box.

Question 29

The list includes six situations.

Which objects in the list experience an unbalanced force?

Accepted Answer

The can, the swing, and the bird

Answer

The book, the ball, and the car

Answer

The ball, the car, and the bird

Answer

The book, the ball, the can, and the swing

Question 30

During a lab investigation, students added four 50 g masses to two boxes and arranged the boxes so that they were motionless on a pulley, as shown in the diagram. The students then
followed the procedure described in the box. The students recorded their observations after each procedure and reset the pulley system to the original conditions.

During which procedures did students observe an unbalanced upward force on Box 1?

Accepted Answer

Procedure 4

Accepted Answer

Procedure 5

Answer

Procedure 1

Answer

Procedure 2

Answer

Procedure 3

Question 31

A student lets a toy car roll four times down a ramp that is 1 m long. Each time the student covers the surface of the ramp with a different material. The student measures the time it takes the car to roll down the ramp and records the results in the table below.

Which of these would be the best conclusion based on the data in the table?

Accepted Answer

Different surfaces affect how fast a toy car accelerates.

Answer

Different toy cars travel at different speeds.

Answer

Gravity has little effect on the speed of toy cars on different surfaces.

Answer

Air resistance is the greatest factor in limiting the acceleration of different toy cars.

Question 32

The masses of four vehicles and the net forces acting on them as they enter a highway are recorded in the table below.

Which vehicle has the greatest acceleration as it enters the highway?

Accepted Answer

Coupe

Answer

Sedan

Answer

SUV

Answer

Truck

Question 33

When a kicker on the football team kicks a field goal, which forces are evident?

Accepted Answer

All of these.

Answer

The action of his foot striking the ball and the reaction of the ball against his foot.

Answer

The mass of the ball being accelerated from rest by the kicker.

Answer

Air friction slowing the ball as it is flying through the goal posts.

Question 34

Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?

Accepted Answer

The car with the smaller mass will require less force to stop than the car with the larger mass.

Answer

The car with the larger mass will maintain its velocity while traveling down the hill.

Answer

The car with the smaller mass will take longer to stop than the car with the larger mass.

Answer

The car with the larger mass will have less inertia than the car with the smaller mass.

Question 35

Four students raced toy cars on a track. The mass and the acceleration of each car is recorded in the table below.

Which toy car had the greatest applied force?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 36

Sir Isaac Newton had three laws of motion. A bookshelf with books on it is heavier and harder to move than a bookshelf with no books on it. Which statement explains which of Newton's Laws is being used to move the bookcases?

Accepted Answer

The second law of motion because heavier objects are harder to move.

Answer

The first law of motion because you are moving the object.

Answer

The third law of motion because you aren't able to move the object.

Answer

All the laws of motion are used when moving the bookshelf.

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