8th Grade Science Study Guide

What two factors affect the strength of an object's gravitational pull?

• Color and density

• Mass and distance

• Temperature and size

• Texture and weight

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

All objects on Earth fall at the same rate unless affected by:

• Magnetism

• Air resistance

• Electrical force

• Sound waves

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Which layer of the Earth is responsible for its magnetic field?

• The crust

• The mantle

• The inner core

• The outer core

What is the standard rate of acceleration due to gravity on Earth?

• 3.7 m/s²

• 24.8 m/s²

• 9.8 m/s²

• 0 m/s²

What is the difference between mass and weight?

• Mass changes with gravity, weight stays constant.

• Mass is the amount of matter, weight is the force exerted by gravity.

• Mass is measured in pounds, weight is measured in kilograms.

• Mass and weight are the same thing.

Which of the following is an example of a non-contact force?

• Friction

• Applied force

• Gravity

• Air resistance

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What is the primary cause of air resistance?

• Magnetism

• Friction

• Gravity

• Electrical force

In a lightning strike, what type of particles move to the bottom of the cloud?

• Positively charged

• Neutrally charged

• Negatively charged

• Uncharged

What property of moving objects depends on both mass and velocity?

• Inertia

• Acceleration

• Momentum

• Force

Tags

NGSS.MS-PS3-1

What is required for a lightbulb to turn on in an electrical circuit?

• An open circuit

• A closed circuit

• High voltage

• Low resistance