Inertia, Balanced, and Unbalanced Forces

An object will not have any inertia if it is _______ (include all that apply)

• accelerating

• acted upon by an unbalanced force

• Nonsense! All objects have inertia

• at rest

• changing direction

A sled slides down a hill, reaches the level surface and eventually comes to a stop. The fact that the sled ultimately stops in best explained by ________

• the presence of an unbalanced force (for example, friction) can cause a moving object to stop

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

• the natural tendency of any object is to ultimately stop

• the presence of inertia cause it to stop

Tags

NGSS.MS-PS2-2

Jack and Jill are arguing in the cafeteria. Jill says that if she flings the Jello with a greater speed, it will have a greater inertia. Jack argues that inertia does NOT depend on speed, but rather upon mass. Who is correct?

• Jack

• Jill

Tags

NGSS.MS-PS3-1

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

• True

• False

The velocities and masses of four are shown. Rank these objects in order of their inertia from greatest to least.

• m = 10 kg

  v = 0 m/s

• m = 3 kg

  v = 3 m/s

• m = 4 kg

  v = 1 m/s

• m = 5 kg

  v = 2 m/s

Intertia refers to _____

• the force that keeps stationary objects at rest

• the tendency of stationary objects to remain at rest

• the tendency of moving objects to maintain their state of motion

• the force that keeps moving objects in motion with a constant velocity

Tags

NGSS.MS-PS2-2

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

• eventually stop since all objects ultimately slow down

• continue in motion with the same speed and direction

• eventually stop as its inertia becomes used up

• none of these

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

If you were in a spaceship and fired a cannonball into frictionless space, the amount of force needed to keep the cannonball in motion would be ________

• more than the force with which it was fired

• less than the force with which it was fired, but not zero

• equal to the force with which it was fired

• zero since no force is necessary to keep an object moving

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

An object moving at a constant velocity MUST

• be experiencing a balance of forces

• not have a force of friction acting on it

• eventually stop due to the force of gravity

• none of these

Tags

NGSS.HS-PS2-1

When all individual forces acting upon an object are balanced, it is the natural tendency of the object to _________

• eventually stop

• accelerate

• maintain its state of motion

• either stay at rest or come to a resting position

• keep its velocity constant (or stay at rest if it was at rest)

Tags

NGSS.HS-PS2-1