6.8a and 6.9c

(8.6A) For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records data in the table below.
Which of these best explains the student's data?

• The speed of the cart decreases as the cart rolls down the ramp because of friction between the cart and the ramp.
• The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is greater than the force of gravity.
• the speed of the cart increases as the cart rolls down the ramp because the forces acting on the cart are unbalanced.
• the speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are balanced

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

(8.6A) Some students measure the acceleration of a wheeled cart being acted on by varying forces. The students record their data in the table shown above. According to the data table, how much force is acting on the cart when the students measure an acceleration of 2.6 m/s²?

• 13 N
• 7 N
• 8 N
• 12 N

Tags

NGSS.MS-PS2-2

(8.6A) The diagram below shows a boat moving north in a river at 3 m/s while the current in the river moves south at 1 m/s.
How will the boat be affected if it enters a part of the river where the current is moving south at 2 m/s?

• The boat will move slower.
• the boat will move faster.
• The boat will stop.
• The boat will move to the west.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

(8.6C) 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?

• The car with the smaller mass will require less force to stop than the car with the larger mass.
• The car with the larger mass will maintain its velocity while traveling down the hill.
• The car with the smaller mass will take longer to stop than the car with the larger mass.
• The car with the larger mass will have less inertia than the car with the smaller mass.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

(8.6C) Four students raced toy cars on a track. The mass and acceleration of each car is recorded in the table.
Which toy car had the greatest applied force?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS2-2

(8.6C) Sometimes tectonic plates do not move easily past one another, and the plates become stuck. Forces build up, and when the plates finally move, tension is released, as shown in picture.
The sudden movement of the plate is caused by-

• the mass of the plates
• the weight of the plates
• unbalanced forces
• gravitational force

Tags

NGSS.MS-ESS2-3

(8.6B) What is the difference between the velocity and the speed of an object?

• Velocity is the change in distance over time, while speed is the change in velocity over time.
• Velocity has a direction associated with it, while speed has no specific direction.
• Velocity has no direction associated with it, while speed has a specific direction.
• Velocity is the change is speed over time, while speed is the change in distance over time.

(8.6B) The three vehicles shown below are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity.
The pickup truck has a changing velocity because the pickup truck--

• can accelerate faster than the other two vehicles
• is traveling in the opposite direction from the other two vehicles
• is traveling on a curve in the road
• needs a large amount of force to move

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

(7.7A) Two boxes and their masses are shown.
Which of the following situations shows work being done?

• A student is is sitting in a chair and holding both boxes.
• A student is holding the large box 1 m above the floor.
• A student is standing and holding the small box.
• A student is lifting the small box .5 m from the floor to a table

(7.7A) Four students volunteered to help a librarian move containers of library materials. the graph shows the amount of force used to lift the containers. The numbers in the bars show the mass of each container. The results for each student helper are shown in the table.
Based on this info, which student helper did not do any work on a container?

• Helper w
• Helper X
• Helper Y
• Helper Z