Unit 1 Review

A student conducts an investigation to understand a particular type of force. The student moves a discharge wand toward the metal sphere of a Van de Graaff generator while it is operating. Which type of force is the student investigating?

• Magnetic

• Electrical

• Frictional

• Gravitational

Tags

NGSS.MS-PS2-3

Which piece of evidence best supports the idea that the discharge wand and metal sphere can exert forces on each other without being in contact?

• The discharge wand is connected to the generator by a wire.

• The distance is reduced from the discharge wand to the metal sphere.

• A spark is released when the discharge wand moves toward the metal sphere.

• A sound is produced when the generator is turned on and the rubber belt moves.

Tags

NGSS.MS-PS2-5

Nathan holds two magnets near each other. He finds that the magnets stick to each other as shown in the illustration below. Magnet A has the poles listed in the picture. How would you label the poles on Magnet B?

• Both Point 1 and Point 2 are south poles.

• Both Point 1 and Point 2 are north poles.

• Point 1 is a south pole and Point 2 is a north pole.

• Point 1 is a north pole and Point 2 is a south pole.

During induction, a positively charged rod is brought near to but not touching the electroscope. The presence of the charged object above the plate of the electroscope induces charges to move down into the fold leaves, giving the electroscope an overall positive charge. The leaves then repel. The same process occurs when the north poles of two magnets are brought close together. Both illustrate the principle that

• Induction produces magnetism

• Electricity induces magnetism

• Opposite charges or poles repel

• Like charges or poles repel

Tags

NGSS.MS-PS2-5

A heavyweight boxer winds up and punches a punching bag. Which two of the following are true?

• The punching bag exerts more force than the fist.

• The force acting on the bag is equal and opposite to the force acting on the fist.

• The fist creates the action force and the punching bag creates the reaction force.

• There is no force between the two objects because they are balanced.

• The fist exerts more force than the punching bag.

Tags

NGSS.MS-PS2-1

Stew Dious studies for his exam for such a long time that he falls asleep standing up. Stew pushes straight down on the floor with 150 pounds of force due to gravity and he does not move, as he is sound asleep. Which two of the following statements are true?

• The floor pushes straight up and to the right on Stew's feet.

• The floor force pushes in the same direction as Stew's feet.

• The floor pushes straight up on Stew's feet.

• The floor pushes down on Stew's feet. The total force exerted by the floor on Stew's feet is 150 pounds.

Tags

NGSS.MS-PS2-4

Two ice skaters push against each other (see image below). The skater on the left has a mass of 70.0 kg and the skater on the right has a mass of 90.0 kg. If the skater on the left experiences a force of 250 N, how many Newtons of force is experienced by the skater on the right?

• Can not be determined

• 194 N

• 250 N

• 340 N

Tags

NGSS.MS-PS2-1

A student decides to investigate an electromagnet’s strength. The results of the investigation are in the table:

Based on this information, which part of the investigation is most likely the independent variable?

• The type of wire

• The number of coils

• The size of the battery

• The strength of the magnet

Which phenomenon is most likely being tested during the investigation in question 9?

• The larger the nail is, the more magnetic force it will have.

• The battery increases in power when there are more coils in the wire.

• The magnetic force increases when more coils are wrapped around the nail.

• The wire around the nail needs to be thin to make the magnetic force stronger.

Tags

NGSS.MS-PS2-3

Students learned that objects can exert forces on other objects without touching. Which three investigations will provide evidence to support what they have learned?

• Measuring how close a soda can must be before it rolls toward a balloon that has been rubbed on someone’s hair

• Counting the number of staples that are directly attached to a strong magnet

• Dropping a rubber ball from a distance of 1.5 meters above the classroom floor

• Placing a magnet near a jar containing a mixture of iron filings and sand

• Measuring how far a toy car travels across the floor before coming to a stop

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5