First Law and Velocity Review

Because of inertia, a moving object will keep ________.

• at rest
• moving
• in one spot
• inertia 

Which of the following is an example of inertia?

• Slamming on the breaks in your car and flying forward.
• An apple falling off of a tree. 
• Running at a cross country event. 

What keeps each planet in orbit around the Sun?

• a balance of inertia and gravity

• more gravity than inertia

• more inertia than gravity

• a balance of weight and mass

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Suppose that an astronaut throws a baseball in outer space at a location far from significant influences of gravity and air resistance. One would expect that the baseball would ____.

• eventually stop since all objects ultimately "lose their steam"

• eventually stop as its inertia slowly becomes used up

• continue in motion with the same speed and direction

• either a, b, or c -- depending on whether the astronaut continues to push it

Tags

NGSS.MS-PS2-2

Inertia is a force that keeps stationary objects at rest and moving objects in motion at a constant velocity.

• True

• False

The law of inertia (Newton's first law) applies _____.

• to moving objects only

• only to objects that are not moving

• to both moving and nonmoving objects

A skateboard rolls down a hill, reaches the level surface and eventually comes to a stop. The fact that the skateboard ultimately stops is best explained by ____.

• an unbalanced force would be required to keep the sled moving forward at constant speed

• the presence of an unbalanced force (e.g., friction) can cause a moving object to stop

• the presence of inertia causes it to stop

• the natural tendency of any object is to ultimately stop

Tags

NGSS.MS-PS2-2

An astronaut kicks a soccer ball in outer space at a location far from significant influences of gravity and air resistance. The soccer ball will _________.

• continue in motion with the same speed and direction

• eventually stop as its inertia slowly becomes used up

• eventually stop since all objects ultimately "lose their steam"

• either a, b, or c -- depending on whether the astronaut continues to kick it

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a(n) ____________________.

• unbalanced force

• inertia

• mass

• balanced force

Tags

NGSS.MS-PS2-2

Because of inertia, a resting object will remain at ________.

• rest
• a constant speed
• school
• inertia