Equilibrium Concepts

A ball is thrown vertically upwards. After the ball is released and it is moving upwards towards its peak, it slows down. During this time...

• there are no forces whatsoever acting on the ball.

• the forces acting on the ball are balanced.

• the ball is experiencing an unbalanced force; it is directed upwards.

• the ball is experiencing an unbalanced force; it is directed downward.

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

• equal to the force with which it was fired.

• more than the force with which it was fired.

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

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

• equal to the weight of the cannon.

The forces acting on an object are BALANCED. Therefore, one can be absolutely certain that the object ... (Include all that apply)

• is at rest.

• has an acceleration of 0 m/s/s.

• is moving and moving in a straight line.

• is moving and moving with a constant velocity.

• has a velocity of 0 m/s.

Mr. S guides a golf ball around the outside rim of the green at the Hole-In-One Putt-Putt Golf Course. When the ball leaves the rim, which path (J, K, or I) will the golf ball follow?

• J

• K

• L

The forces acting on an object are NOT BALANCED. Therefore, one can be absolutely certain that the object.... (Include all that apply)

• is at rest.

• has an acceleration of 0 m/s/s.

• is moving and moving in a straight line.

• is not accelerating.

• is accelerating.

Which objects could be moving to the right at a constant speed? (Include all that apply)

• A

• B

• C

• D

• E

An object moving at a constant velocity MUST... (Choose one)

• not have a force of friction acting on it.

• not have any forces acting on it.

• be experiencing a balance of forces.

• eventually stop due to the force of gravity.

• not have any force of gravity acting on it.

The oil drop diagram depicts the motion of a rightward-moving object. Which of the force diagrams is consistent with the oil drop diagram? (Include all that apply)

• A

• B

• C

• D

• E

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

• either stay at rest or come to a rest position.

• accelerate.

• keep its velocity constant (either at zero or non-zero).

• evantually stop

• maintain its state of motion.

Inertia 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 eventually stop over time.

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