A teacher pushes a bookshelf with a constant force across a classroom floor. How can the teacher increase the change in motion of the bookshelf?

• add more books to the shelf

• put all the books on the middle shelf

• have more teachers push the bookshelf in the same direction

• push the bookshelf with the same force in the opposite direction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Emergency workers drop a box of supplies from a moving airplane. The package falls quickly through the air until the parachute opens. Then, the package falls at a slower rate. Which statement describes the force that slows the fall of the package?

• The open parachute decreases the force of gravity.

• The airplane forms currents near the airplane.

• The air pushes up against the parachute.

• The magnetic force from the airplane attracts the parachute.

Tags

NGSS.MS-PS2-2

The city of Toledo, Ohio is 200 miles north of Cincinnati, Ohio. The table shows the schedule for the train traveling between the two cities with no stops. Which departure time is the fastest train to Cincinnati?

• 8:30

• 9:15

• 3:55

• 7:00

Kevin and Max each push a wheelbarrow across a field. Kevin pushes Wheelbarrow A with a greater force than Max pushes Wheelbarrow B. Both wheelbarrows have equal mass. Which statement describes the position of the two wheelbarrows on the number line after five seconds?

• Both wheelbarrows arrive at line 3 on the number line at the same time.

• Wheelbarrow B travels faster along the number line than wheelbarrow A.

• Both wheelbarrows travel at the same constant speed along the number line.

• Wheelbarrow A travels a greater distance along the number line than Wheelbarrow B.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A squirrel runs 10 meters across a lawn, then 10 meters up a tree. The squirrel runs one meter every second. How many seconds does it take for the squirrel to run across the lawn and up the tree?

• 2 seconds

• 10 seconds

• 20 seconds

• 100 seconds

Which statement is true about objects that are at rest (not moving)?

• Very heavy objects will not move even if a very strong force acts on them.

• Very light objects begin to move without a force acting on them.

• Objects at rest move unless a force holds them in place.

• Objects at rest will not move unless a force acts on them.

Scientists measure the speed of lizards when running to catch prey and when running to escape predators. The scientists conclude the lizards run fast if they are running after prey, but they run even faster if they are running away from predators. Select the two variables the scientists could use to measure the relative speed of running lizards to support their conclusion.

• color of the lizard's skin and length of the lizard's tail

• number of prey a lizard catches and number of predators hunting the lizard

• speed of the lizard running toward and away from its habitat

• distance the lizard runs and time it takes the lizard to travel that distance

A student pushed a cart in a straight line for three trials. In the first trial she applied a small force to the cart. In the second trial she applied a medium force, and in the third trial she applied a large force. She observed the relationship between the force she applied and the change in speed of the cart. Which bar graph shows the relationship between the force applied to the cart and the change in speed in the student’s three trials?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

Two identical wagons, A and B, are next to each other on a flat surface. The wagons are not moving and are not touching.

The student wants Wagon A to have a greater increase in its speed than Wagon B when an equal force is applied to both wagons.

What could the student do to one of the wagons to achieve this result?

• Put a bag filled with books in Wagon A only.

• Put a bag filled with books in Wagon B only.

• Push Wagon A towards the right instead of straight.

• Push Wagon A toward the left and push Wagon B toward the right.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A teacher is pushing a cart filled with books down a hallway with a wooden floor. Which change would help the teacher move the cart more easily?

• putting fewer books in the cart

• removing the wheels from the cart

• carrying the cart instead of rolling it

• laying carpet over the wooden floor

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5