7.5 Center of Mass

What is assumed about the gravitational force exerted on an object that gives it its weight in relation to its center of mass (CM)?

• It is assumed to be exerted at the top of the object.

• It is assumed to be exerted at the CM.

• It is assumed to be exerted at the base of the object.

• It is assumed to be exerted on the end of the object.

Answer explanation

The whole weight of the stick is assumed to act at the CM

Because the hammer balances by placing your finger under the X, the X is the _____.

• center of mass

• mass torus

• uniform

• torque

What condition(s) is necessary for an object to balance and be stable? Pick 2.

• The CM must be below the suspension point.

• The CM must be outside of the base.

• The CM must be above the base.

• The CM must be inside of the material of the object.

How is the mass of an object related to its center of mass (CM)?

• The mass is always evenly distributed around the CM.

• The mass does not need to be evenly distributed around the CM.

• Most of the mass is concentrated at the CM.

• The mass is irrelevant to the location of the CM.

What happens when the center of mass (C) of an object is directly below point P and the object is supported at point P?

• The object will be balanced.

• The object will fall.

• The object will rise.

Tags

NGSS.MS-PS2-4

This hammer, balanced at its CM, is _____.

• not uniform

• uniform

• unbalanced

• not in equilibrium

Answer explanation

It is only uniform if it balances in the middle and has the same cross section throughout

This object is in _____ equilibrium.

• unstable

• stable

• neutral

This object is in _____ equilibrium.

• unstable

• stable

• neutral

This object is in _____.

• stable equilibrium

• unstable equilibrium

• neutral equilibrium

Why isn't this person standing upright?

• The bag has shifted his CM to his left hand

• He has to shift his CM above his feet

• It's a choice

• He is going to fall to his left away from his bag

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2