8.6ab

Which of these BEST describes an atom?

• A particle of matter that carries an overall positive charge.

• A particle of matter that is formed by the bonding of two or more molecules.

• The smallest particle of an element that shows all the properties of that element.

• The smallest particle of an element that can be broken down further to form molecules

A student is heating water to make hot chocolate. He begins thinking about the effect of heating on the particles of water. Which of these statements correctly describes how the particles of water are affected as the water is heated?

• The particles start moving faster.

• The particles start moving slower.

• The particles start vibrating in fixed positions.

• The particles start expanding to take up more space

Tags

NGSS.MS-PS1-4

During which two intervals of time was the train moving with a constant, positive acceleration?

• 0–5 and 10–15 minutes

• 5–10 and 15–25 minutes

• 10–15 and 25–30 minutes

• 15–20 and 30–35 minutes

Tags

NGSS.MS-PS3-1

When a roller-coaster car reaches the top of a hill and starts going downward, there is a change in the direction and speed of the car. Which of these can also be concluded about the roller-coaster car as it is going downward?

• Its kinetic energy decreases as its potential energy proportionally increases.

• Its potential energy decreases as its kinetic energy proportionally increases.

• Both its potential and kinetic energy proportionally increase.

• Both its potential and kinetic energy proportionally decrease.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A cart is being pushed over a smooth surface with a constant force. After five seconds, the cart starts moving over a rough surface. How will the cart be affected once the surface changes?

• The cart's inertia will increase.

• The cart's velocity will increase.

• The cart's friction will decrease.

• The cart's acceleration will decrease.

Tags

NGSS.MS-PS2-2

What is the difference between a conductor and an insulator?

• Wood is a good conductor but not a good insulator.

• Metal is a good insulator but not a good conductor.

• A conductor transmits energy very well while an insulator does not

• An insulator transmits energy very well while a conductor does not.

Which of these can be concluded about substances P and Q?

• P and Q are both compounds.

• P is an element and Q is a mixture.

• P is a mixture and Q is a compound.

• P is a compound and Q is an element.

Tags

NGSS.MS-PS1-1

A force diagram for a downhill skier is shown. Which statement is a valid description and explanation of the skier’s motion based on evidence from the diagram?

• The skier’s speed decreases going down the hill because forces F1 and F2 are balanced and acting perpendicular to the direction of the velocity, causing the skier to speed up.

• The skier’s speed increases going down the hill because forces F1 and F2 are balanced and acting perpendicular to the direction of the velocity causing the skier to slow down.

• The skier’s speed increases going down the hill because forces F3 and F4 are unbalanced, with F3 acting in the same direction as the velocity, causing the skier to speed up.

• The skier’s speed decreases going down the hill because forces F3 and F4 are unbalanced, with F4 acting in the opposite direction of the velocity, causing the skier to slow down.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Two toy cars move in the same direction with velocities that are shown in the graph.

Based on the information in the graph, which statement describes the motion of the two toy cars?

• Car 1 is traveling faster than car 2.

• Car 2 is traveling farther than car 1.

• Car 1 has constant velocity between 0 and 10 seconds.

• Car 2 is changing direction between 10 and 15 seconds.

Tags

NGSS.MS-PS3-1

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