IS2 LT2.2 Review!

Which unit/s is/are used to express the magnitude of force? (You may select multiple answers, if applicable.)

• Newton (N)

• kg * m/s

• kg² * m/s

• kg * m/s²

Which scenario demonstrates static or dynamic equilibrium? (You may select multiple answers, if applicable.)

• a vase resting at the top of a table

• a bus following a zigzag path

• a bird flying up and down the sky

• a satellite up in space traveling at constant speed

An object in free fall means that the object is only acted upon by:

• weight

• normal force

• buoyant force

• air resistance

A box is pushed to the right across a rough horizontal surface. Which free-body diagram CORRECTLY illustrates this?

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Which has the GREATEST unbalanced net force acting on the block?

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Evaluate these statements:
1. Aristotle's concepts on force and motion still holds true today.
2. Copernicus argued against the idea that the Earth is at the center of the universe.

• Both are correct.

• Both are incorrect.

• Only Statement 1 is correct.

• Only Statement 2 is correct.

Which has more inertia: a 50-kg astronaut on Earth, or a 50-kg astronaut on the moon?

• the astronaut on Earth

• the astronaut on the moon

• both have equal inertia

• unknown; inertia is not measured in kg

The same toy car is pushed twice; first with a net force of 50N and then followed by a net force of 100N. What can be said about the resulting acceleration in both instances?

• Acceleration is doubled on the second instance.

• Acceleration decreases by half on the second instance.

• Acceleration is zero in the first instance.

• Acceleration does not change.

A rolling basketball heads directly towards a running motorcycle. What can be said about the interaction of forces between the two objects?
(Action -- rolling ball pushes the motorcycle; Reaction -- motorcycle pushes the rolling ball)

• The magnitude of the action force is greater than the reaction force.

• The magnitude of the reaction force is greater than the action force.

• Both forces have the same magnitude of force, and will experience the same acceleration.

• Both forces have the same magnitude of force, but the ball experiences greater acceleration.

Which is CORRECT regarding density? (You may select multiple answers, if applicable.)

• measured in kg/m³ in SI units

• ratio of mass to volume

• amount of space occupied by a substance

• can determine whether an object sinks or float