Part 2 8th grade Science study guide

You see an image of yourself in a mirror because light waves are

• 
  

• diffracted

• reflected back at you

• refracted through the air

• refracted through a focal point

Tags

NGSS.MS-PS4-2

Joe is the best baseball player in the world. He can throw a baseball faster than anyone. If the mass of the baseball was increased by 50%, but he applied the same force as he did to a lighter baseball, which of these would best describe Joe's attitude?

• Joe would love to use the new ball in future baseball games.

• Joe would be happy as the new ball would have a faster acceleration.

• Joe would be unhappy as the new ball would have a slower acceleration.

• Joe's attitude would not change as there would be no change in the acceleration

Tags

NGSS.MS-PS2-2

The wave pictured represents a sound wave. Which label along the wave represents a sound with the LOWEST energy?

Responses

• 
  

• A

• B

• C

• D

Tags

NGSS.MS-PS4-1

A police car is parked by the side of a highway and its siren emits a sound measuring 750 Hz. As you approach the police car from a distance, you hear a change in the sound. The change is in the sound's

• pitch only

• wavelength only

• frequency only

• pitch and frequency

Tags

NGSS.HS-PS4-1

A wheelbarrow is experiencing two forces. One is pushing 5 N to the east and the other 5 N in the exact opposite direction. What must be true of the wheelbarrow's motion?

• it is moving

• it is accelerating

• it is slowing down

• it isn't accelerating

Tags

NGSS.MS-PS2-2

The law of inertia states that an object in motion will stay in motion, and an object at rest will stay at rest unless acted upon by an unbalanced force. Which law of motion is this describing?

• Newton's First Law

• Newton's Third Law

• The law of gravity

• Newton's Second Law

A box experiences a force of 2 N to the left and 3 N to the right. Which is true of the box's motion?

• the box will slow down

• the box's velocity will be 1 m/s

• the box's velocity will not change

• the box will experience acceleration

Tags

NGSS.MS-PS2-2

In a classroom experiment, a student rubs a comb against her hair. The comb is then brought near bits of paper resting on a surface. Which of these can be concluded if the comb picks up the bits of paper?

• The comb is an insulator, but paper conducts electricity.

• The comb had a net charge on it, and it attracted a neutral object.

• The comb was left uncharged, and it attracted a positively charged object.

• The comb was positively charged, and it attracted a negatively charged object.

Tags

NGSS.MS-PS2-3

There are four forces acting on the box: A spring pulls with a force of 40 N. The force of gravity acts downward; and the force of the table is pushing up on the box. What MUST be true of the frictional force if the box moves across the table?

• it is equal to the effort force

• • 
    

    it is less than the effort force

• it is more than the effort force

• it is equal to the force of gravity

Tags

NGSS.MS-PS2-2

Which electromagnet would have the most strength?

• an electromagnet with 5 coils

• an electromagnet with 10 coils

• an electromagnet with 15 coils

• an electromagnet with 20 coils

Tags

NGSS.MS-ETS1-3