Inertia, Balanced, and Unbalanced Forces

Front

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

Back

Nonsense! All objects have inertia

Front

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

Back

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

Front

Who is correct about inertia: Jack or Jill?

Back

Jack

Front

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

Back

False

Front

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...

Back

continue in motion with the same speed and direction

Front

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

Back

zero since no force is necessary to keep an object moving

Front

An object moving at a constant velocity MUST

Back

be experiencing a balance of forces

Front

A ball is thrown vertically upwards. After the ball is released and is moving upwards towards its peak, it slows down. During this time, what is happening to the forces acting on the ball?

Back

The ball is experiencing an unbalanced force

Front

If a leftward-moving object experiences an unbalanced force, then the object will have an acceleration.

Back

True

Front

A leftward moving object is coasting to a stop along a straight, level surface. The net force acting up on the object must be: leftward, rightward, zero, need more information to be able to tell.

Back

rightward