Chapter 12 Forces

If you are given the mass of an object in pounds, the time in seconds, and the distance in feet, what must you do before you can calculate the momentum in SI units?

• convert the mass to kilograms

• convert the distance to meters

• Both (a) and (b)

• None of the above

Of the following, the greatest gravitational force would occur between

• a marble and a baseball 5 meters apart.

• a loaded freighter on the high seas and Earth.

• the moon and an astronaut standing on the moon.

• the moon and Earth.

The law that states that every object maintains constant velocity unless acted on by an unbalanced force is

• Newton's first law of motion.

• Newton's second law of motion

• Newton's third law of motion.

• the law of conservation of momentum.

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The law that states that the unbalanced force acting on an object equals the object’s mass times its acceleration is unbalanced force is

• Newton's first law of motion.

• Newton's second law of motion

• Newton's third law of motion.

• the law of conservation of momentum.

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One pound is equal to how many newtons?

• 4.448 N

• 2.2 N

• 0.225 N

• 12.5 N

Which of the following equations is correct?

• w = mg

• w = m/g

• w = g/m

• w = g + m

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What is the unbalanced force that slows down a ball rolling across the floor?

• the force of friction

• the force of gravity

• the force of inertia

• the force of momentum

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Express the following as an equation: One newton is the force that can give an object with a mass of 1 kg an acceleration of 1 m/s²

.

• 1 N = 1 kg / 1 m/s²

• 1 N x 1 kg = 1 m/s²

• 1 N = 1 m/s² / 1 kg

• 1 N = 1 kg x 1 m/s²

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In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height?

• The book would accelerate twice as fast as the rock.

• The rock would accelerate twice as fast as the book.

• The book would accelerate ten times as fast as the rock.

• They would not differ; they would be the same.

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NGSS.MS-PS2-4

A seat belt helps you when your car stops suddenly by providing a(n)

• balanced forward force.

• unbalanced forward force.

• balanced backward force.

• unbalanced backward force.

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