Which THREE statements correctly compare the motion of the cars?

Car B is traveling faster than Car C but slower than Car A.

Car C is traveling slower than Car A and Car B.

Car A and Car B are moving at a constant speed for the entire distance.

Car A is traveling faster than Car B but slower than Car C.

Car B and Car C move at a steady speed for the entire distance.

Which of the following correctly describes the object's motion?

The object is moving with constant velocity.

The object is moving with increasing acceleration.

The object is moving with constant acceleration.

The object is moving with increasing velocity.

While at soccer practice, Abbey runs down the field at 10 meters per second. She has a constant speed and does not change direction. What is Abbey's acceleration?

The acceleration is 0 m/s 2 because her velocity did not change.

The acceleration is 10 m/s 2 because her velocity increased.

The acceleration is 0 m/s 2 because her velocity increased.

The acceleration is 10 m/s 2 because her velocity did not change.

A balloon rocket is made by attaching a balloon to a straw with tape. The straw is threaded onto a wire that is stretched across a room. When the air is released, the balloon travels in a direction opposite to the air flow, as shown. Two investigations are planned with the balloon rockets. In the first investigation, a regular balloon rocket will be tested and a balloon rocket with five pennies attached to it will be tested. In the second investigation, two balloons will be attached to the same straw, facing each other. The air in these two balloons will be released at the same time. Which scenario would provide the BEST evidence that an object subjected to balanced forces does not change its motion?

In the second investigation, both balloons are released at the same time, but the rocket does not travel any distance.

The balloons do not move in both investigations before the air is released.

The two balloons face each other in both investigations before air is released from them.

In the first investigation, five pennies are attached to the balloon to see if it can move when air is released.

Scientists in space are on a mission to collect rock samples from another planet. The scientists use a 65,000 kg space vehicle to carry the samples back to the space station. The space vehicle uses thrusters to control its motion. The space vehicle is shown. Which best explains why the space vehicle is able to stabilize and move forward after using the thrusters?

The space vehicle pushes against the thrusters with an equal and opposite force.

The thrusters exert an equal and opposite force against the meteors.

The force of friction between the thrusters and the space vehicle propels it forward.

The space vehicle exerts a greater force on the meteors, propelling the vehicle forward.

A student is sitting still on a swing at the playground. He asks his friend to give him a push. She walks behind him and pushes him forward, and he begins swinging back and forth. When did the student experience unbalanced forces?

when he was pushed forward by his friend

when he sat on the swing without moving

when the forces acting on him were equal from each side

when the forces acting on him were equal from above and below

What will happen to the movement of the box when 10 N of force is added on the right?

The box will move to the right.

Which change in force would stop the box from moving?

adding 6 N of force pulling to the right

adding 6 N of force pulling to the left

subtracting 8 N of force pulling to the left

subtracting 8 N of force pulling to the right

A ball rolls down from the top of a grassy hill, reaches the bottom of the hill, continues to roll, and then starts to slow down and comes to a stop. What forces caused this ball's motion?

Its movement occurs due to unbalanced forces.

Its movement shows Newton's second law of motion.

Its movement is due to balanced forces.

Its movement is not affected by friction in the air

Its movement is not affected if it hits another object.

Javier made a list about balanced and unbalanced forces. Javier made a mistake on his list. Which best describes the mistake Javier made?

Javier switched the descriptions for unbalanced and balanced forces.

Javier forgot to add that forces can never change.

Balanced forces only cause objects to change directions

Unbalanced forces only cause objects to stay in the same place.

A student's class competes in a game of tug-of-war at field day. The student observes that in tug-of-war, each team tries to pull the rope over to its side, and the team that pulls the other over first is the winner. The student decides to set up an investigation to study the forces involved in tug-of-war. Investigation 1 The student finds a rolling cart weighing 50 kilograms and places it on a wooden surface. A rope is attached to both sides of the cart. In the first trial (Trial 1), the cart is pulled with three children each on either side, with each child applying the same force. In the second trial (Trial 2), the cart is pulled with three children on one side and two children on the other. Which statement correctly identifies the nature of the forces acting on the cart in Trial 1 and Trial 2?

The forces are balanced in Trial 1 and unbalanced in Trial 2.

The forces are balanced in both Trial 1 and Trial 2.

The forces are unbalanced in both Trial 1 and Trial 2.

The forces are unbalanced in Trial 1 and balanced in Trial 2.

How will the car be affected if the force from friction and the force from the motor are equal?

The car will maintain constant motion.

The car will come to a complete stop.

The car will increase in speed.

The car will decrease in speed.

Rosa uses a spring scale to pull a cart along a track for 2 meters. The spring scale shows the force exerted on the cart while being pulled. She uses metal plates to vary the mass of the cart, and motion sensors to calculate the average speed and acceleration of the cart. Rosa claims that the force needed to accelerate an object is proportional to the mass of the object. Which statement best supports or disproves Rosa’s claim using the data from the table?

Rosa’s claim is true. The acceleration for each trial is the same. Doubling the mass of the cart causes the force to double in order to maintain the same rate of acceleration.

Rosa’s claim is false. When the mass of the cart increases by 1.0 kg, the force on the cart increases by more than 1.0 kilogram.

Rosa’s claim is false. Even though the mass and the force increase in each trial, the acceleration of the object remains the same.

Rosa’s claim is true. Each time the mass increases by 1.0 or 2.0 kilograms, the force increases by 1.0 or 2.0 newtons respectively. This causes the rate of acceleration to remain constant.

A teacher is demonstrating acceleration to his class by throwing two balls. He throws both balls using the same amount of force in the same direction. The first ball he throws has a mass of 0.1 kg and the second ball has a mass of 0.5 kg. Which statement best compares and describes the likely results of the demonstration?

The first ball has a smaller mass, so it will have greater acceleration than the second ball.

The first ball has a smaller mass, so it will have less acceleration than the second ball.

The balls will have equal acceleration because they are being thrown in the same direction.

The balls will have equal acceleration because they are being thrown with the same force.

Megan left her wagon outside while it was raining and it filled with water. When Megan tried to move the wagon that afternoon, she failed to budge the wagon. Why did Megan's wagon become hard to move?

The rainwater increased the mass of the wagon, increasing the amount of force needed to move it.

The rainwater decreased the force of gravity pushing on the wagon, increasing the force needed to move it.

The rainwater decreased the force of friction pulling on the wagon, decreasing the force needed to move it.

The rainwater increased the mass of the wagon, decreasing the amount of force needed to move it.

The students claim that the force required to move the boxes is directly proportional to their mass. Which argument best supports their claim?

Box X requires the least amount of force because it has the least amount of newtons.

Box W requires the least amount of force because it has the most amount of surface area.

Box Y requires the least amount of force because it has the most amount of newtons.

Box Z requires the least amount of force because it has the least amount of surface area.

Which ball will require the most force to lift?

the soccer ball because it has the most mass

the beach ball because it is the largest in size

the baseball because it has the most material

the golf ball because it is the smallest in size

A student is investigating mass and acceleration. The student applies the same force to two boxes, as shown in the table. The student claims that box 1 must have a smaller mass than box 2. Which argument best supports the student's claim?

Heavier objects require greater force than lighter objects to accelerate at the same rate.

Heavier objects require less force than lighter objects to accelerate at the same rate.

Lighter objects require less force than heavier objects to start moving but will accelerate at the same rate.

Lighter objects require greater force than heavier objects to start moving but will accelerate at the same rate.

Contact Forces (Newton's & Force) Part A

Authored by Joshua Ryan-Jenkins

Science

8th Grade

NGSS covered

Contact Forces (Newton's & Force) Part A

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FILL IN THE BLANK QUESTION

1 min • 1 pt

Is the statement above describing Speed and velocity?

Tags

NGSS.MS-PS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The graph shows the motion of four runners running a race. Which runner had the greatest acceleration during the race?

Runner A

Runner B

Runner C

Runner D

Tags

NGSS.MS-PS3-1

FILL IN THE BLANK QUESTION

1 min • 1 pt

Does the statement above describe speed and velocity?

Tags

NGSS.MS-PS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement best supports the answer to part A?

The steepest constant slope represents the greatest acceleration.

The gentlest constant slope represents the greatest acceleration.

The steepest curved slope represents the greatest acceleration.

The gentlest curved slope represents the greatest acceleration.

Tags

NGSS.MS-PS3-1

FILL IN THE BLANK QUESTION

1 min • 1 pt

Is the statement above describing Speed and velocity?

Tags

NGSS.MS-PS3-1

FILL IN THE BLANK QUESTION

1 min • 1 pt

Does the statement above describe speed and velocity?

Tags

NGSS.MS-PS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Students are investigating the motion of four cars on a racetrack. The graph shows the distance traveled by the four cars. Which statement BEST describes the motion of car D?

The car’s speed increases for 10 seconds and then the car stops moving for the remainder of the time.

The car’s speed decreases for 10 seconds and then remains at a steady speed for the remainder of the time.

The car moves at a steady speed for 10 seconds and then stops moving for the remainder of the time.

The car moves at a steady speed for 10 seconds and then remains at a steady speed for the remainder of the time.

Tags

NGSS.MS-PS3-1

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