According to Newton's third law, which statement describes why it is difficult to walk on an icy pond?

• Your shoes push against the ice, but the ice cannot push your shoes.

• The ice is cold so it crumbles as you push against it.

• Extremely low friction between your shoes and the ice eliminates traction to move you forward.

• The ice melts under your shoes, making it much more slippery.

If a force acts constantly on a stationary object, the object will:

• remain stationary.

• move at a constant speed in the direction of the force.

• accelerate in the direction of the force.

• accelerate in the opposite direction of the force.

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NGSS.MS-PS2-2

When a feather and a hammer are dropped at the same time, why does the hammer hit the ground first?

• Heavier objects always fall faster than lighter objects.

• Air resistance slows the fall of the feather.

• The feather has no mass.

• Gravity only affects heavy objects.

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NGSS.MS-PS2-2

Gravitation is a natural phenomenon where:

• objects with greater mass fall slower.

• objects with greater mass fall faster.

• all objects with mass repel each other.

• all objects with mass attract each other.

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NGSS.MS-PS2-4

If an object is moving at a constant velocity, it means that ___________.

• no net force is acting on it

• a constant force is acting on it in the opposite direction of its motion

• a constant force is acting on it in the direction of its motion

• several forces are acting on it, but one force is greater than the others

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NGSS.MS-PS2-2

What effect does friction have on a moving object?

• It causes the moving object to slow and eventually stop.

• It keeps the moving object moving in the same direction forever.

• It causes the moving object to speed up.

• It causes the moving object to turn around and move in the opposite direction.

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NGSS.MS-PS3-5

The speed and direction of an object's motion is its:

• velocity.

• momentum.

• inertia.

• acceleration

When a feather and a hammer are dropped at the same time, why does the hammer hit the ground first?

• Heavier objects always fall faster than lighter objects.

• Air resistance slows the fall of the feather.

• The feather has no mass.

• Gravity only affects heavy objects.

Tags

NGSS.MS-PS2-2

A block is pushed from four sides with forces of different magnitude, as shown in the picture.  In which direction will the block move?

• north

• east

• south

• south

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NGSS.MS-PS2-2

What of the following would typically be used to express speed?

• miles per hour

• centimeters per mile

• degrees per liter

• grams per liter

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NGSS.MS-PS3-1