8th Grade Forces & Motion

What is Newton's First Law of Motion?

• F=m x a
• Every action has an equal and opposite reaction
• An object at rest stays at rest, an object in motion stays in motion unless acted on by another force. 
• Friction 

What is Newton's First Law known as? The Law of

• Friction
• Mass
• Inertia
• Gravity

Why does an 18-wheeler have more inertia than a bicycle?

• it has more mass
• it has more volume
• it is not as aerodynamic

Tags

NGSS.MS-PS2-2

Newton's second law of motion describes acceleration as force divided by __________.

• mass
• inertia
• speed
• direction

Tags

NGSS.MS-PS2-2

The force that pulls an object in a circular motion and keeps it in a circular motion is centripetal force.

• True
• False

According to __________, the acceleration of an object is equal to the net force acting on the object divided by the object's mass. 

• Newton's Second Law
• Newton's Third Law
• Newton's First Law

Tags

NGSS.MS-PS2-2

An object's velocity can be changed by changing its speed, its direction, or both.

• True
• False

Tags

NGSS.MS-PS3-1

Newton’s law states that for every action, there is an ________ reaction.

• unequal and opposite

• equal and similar

• stronger and opposite

• equal and opposite

Tags

NGSS.MS-PS2-1

When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?

• The cannon moving forward

• The cannon moving backwards

• The cannonball moving backwards

• The cannonball moving forward

Tags

NGSS.MS-PS2-1

A magician pulls a tablecloth out from under dishes and glasses on a table without disturbing them.

• Newton's 1st Law
• Newton's 2nd Law
• Newton's 3rd Law
• None of them

Tags

NGSS.MS-PS2-5