5.6d

Students design an experiment to determine how much force is needed to move blocks of wood of different masses slowly across a lab table. Which procedure should students include in their design? (5.6D)

• Conduct five trials, using a different scale to pull each block of wood

• Conduct five trials, pulling a different side of each block each time

• Conduct five trials, using a different table for each trial

• Conduct five trials, pulling each block of wood in the same way for each trial

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

In the picture below one object is attracted to another by

• gravity

• a push

• magnetism

• friction

• a pull

Tags

NGSS.3-PS2-3

students observe a pendulum and count the number of swings the pendulum makes in one minute. What tool do students need to conduct the investigation?

• metric ruler

• compass

• prism

• timing device

Alexa pushes on a door to open it. How does the concept of forces explain why the door opens?

• The door pushed equally hard on Jeanie as she pushed on it.

• The door moved in the opposite direction of the pushing force.

• The door moved in the direction of the pushing force.

• The door opened because of noncontact forces.

Tags

NGSS.MS-PS2-2

Why is friction classified as a contact force?

• Friction can act when objects are not in direct contact.

• Friction acts when two objects rub against each other.

• Friction causes a change in motion.

• None of the other answers answer choices.

Tom is mowing his lawn and the lawnmower is moving forward. Which of the following statements must be true?

• There are no forces acting on the lawnmower.

• The only force acting on the lawnmower is gravity.

• Tom is applying a force on the lawnmower.

• The total force on the lawn mower is zero.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

When designing an experiment, why is it important to test only one variable?

• Testing one variable explains what caused the change once data has been gathered.

• Testing one variable collects inaccurate data and repeats the investigation more than necessary.

• Testing one variable decreases the reliability of the investigation.

• It is not necessary to test only one variable.

In the science class students learn that friction is the resistance to motion when two objects rub together. The students decide to design an experiment at home to compare frictionon dry and icy surfaces. Which question is the most beneficial for this type of investigation?

• Is it faster to sled down an icy hill or down a rough gravel driveway?

• What is friction?

• What makes ice slippery?

• What effect does the height of the hill have on the distance an object travels.

What force is being tested when an object is forced downward toward the center of Earth?

• Gravity

• Air pressure

• Magnetism

• Friction

Tags

NGSS.MS-PS2-2

Students wrap a copper wire around an iron nail and connect the ends of the wire to battery. The nail attracts other small nails and paper clips as they stick together. What force keeps the nails and paper clips attached together/

• gravity

• electricity

• magnetism

• friction

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5