Force Review

A group of students is playing tug-of-war. The students on both sides of the rope are pulling with equal force so that the rope is not moving. This is an example of..

• unbalanced forces

• balanced forces

• acceleration

• displacement

A firefighter feels the hose pushing backwards onto him as he uses it to put out a fire. What is the most likely cause of this?

• The hose material is very elastic.

• Since the hose is at rest, it tends to stay at rest.

• The force exerted on the water equals the mass of the water times its acceleration.

• The escaping water exerts an equal and opposite force on the hose.

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NGSS.MS-PS2-1

4 different weights are listed below. If the same force is applied to each of them, which one will have the LEAST acceleration?

• m = 0.5 kg

• m= 0.75 kg

• m = 1.0 kg

• m = 7.3 kg

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Which of the following is measured in Newtons?

• weight

• momentum

• mass

• acceleration

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The upward force on an object falling through the air is ____.

• air resistance

• momentum

• inertia

• gravity

The relationship among mass, force, and acceleration is explained by ____.

• Law of Conservation of Momentum

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

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According to Newton’s laws, for any object, the greater the force that's applied to it, the greater its ____ will be.

• acceleration

• inertia

• gravity

• size

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The size of the gravitational force between two objects depends on their ____.

• frictional forces

• inertia

• masses and the distance between them

• speed and direction

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An astronaut is planning a trip to a newly-discovered planet. According to the Law of Universal Gravitation, the astronaut's weight on the new planet will be greater than his weight on Earth if:

• the new planet has less gravity than Earth.

• the new planet has the same gravity as Earth.

• the new planet has more gravity than Earth.

• the gravity of the planet doesn't matter. Weight is the same everywhere in the universe.

"To every action there is an equal and opposite reaction" describes which law?

• Law of Conservation of Momentum

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

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