In physical science, a push or pull is called a

• force

• acceleration

• inertia

• motion

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NGSS.3-PS2-1

Which of the following is an example of exerting a force?

• a child running through a field

• a train speeding down a track

• a carpenter hammering a nail

• an airplane soaring through the sky

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NGSS.MS-PS2-2

The SI unit for force is the

• Newton

• meter

• kilogram

• pound

Forces can be added together only if they are

• acting on the same object

• balanced forces

• unaffected by gravity

• substantial

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NGSS.MS-PS2-2

Balanced forces acting on an object

• always change the object's motion

• sometimes change the object's motion

• never change the object's motion

• are not related to motion

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NGSS.MS-PS2-2

What happens when two forces act in the same direction?

• They cancel each other out

• The stronger one prevails

• They add together

• Their sum divided by two is the total force

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NGSS.MS-PS2-2

The force that one surface exerts on another when two rub against each other is called

• friction

• acceleration

• inertia

• gravity

Air resistance is a type of

• motion

• acceleration

• velocity

• friction

Objects falling through air experience a type of friction called

• terminal velocity

• air resistance

• inertia

• rolling friction

When the only force acting on a falling object is gravity, the object is said to be

• stationary

• decelerating

• in free fall

• a projectile

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NGSS.MS-PS2-4