Final review Physical Science

A man jogs at a velocity of 2.5 m/s west for 1,200 s. He then walks at a velocity of 1.0 m/s east for 500 s and then stops to rest. What is the displacement of the man when he stops to rest?

• 3,500 m west

• 3,000 m west

• 2,500 m west

• 700 m west

The graph below shows the motion of four cars.

Based on the graph, which statement about all the cars is true?

• They are moving at a constant speed.

• They are changing their speed during travel.

• They are slowing down.

• They are stopped.

Tags

NGSS.MS-PS3-1

As the wheels of a train move along the train tracks, what type of friction exists between the wheels and the tracks?

• fluid friction

• rolling friction

• sliding friction

• static friction

A child fills a bucket with salt water and sand. How are the contents of the bucket classified?

• a solution

• a compound

• a homogeneous mixture

• a heterogeneous mixture

This diagram shows a 40-kg object being pulled in one direction while friction acts on it in the opposite direction.

What is the net force on the object?

• 160 N

• 140 N

• 120 N

• 20 N

Tags

NGSS.MS-PS2-2

Which element is classified as a metal?

• boron (B)

• antimony (Sb)

• phosphorus (P)

• cadmium (Cd)

Four different liquids will be separately poured into a single beaker. The liquids are ethanol, milk, oil, and water. The density for each liquid at room temperature is listed in the table below.

How will the liquids be arranged from bottom to top in the beaker?

• milk, water, oil, ethanol

• milk, water, ethanol, oil

• water, milk, oil, ethanol

• water, oil, ethanol, milk

Tags

NGSS.MS-PS1-2

The diagram below is the Bohr model of an atom.

Which best describes this atom?

• It has 6 electrons.

• It has a positive charge.

• It has 6 valence electrons.

• It has a full outermost energy level.

Tags

NGSS.MS-PS1-1

Which diagram correctly shows how electrically charged balls will act?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What type of bond will form when an element from group 2 (IIA) bonds with an element from group 17 (VIIA)?

• hydrogen bond

• covalent bond

• metallic bond

• ionic bond