Centre of Mass - Grade 8

Which one is the measure of how much matter an object has?

• weight

• gravity

• mass

• volume

Where will the centre of mass of a uniform rod lie ?

• At its end

• At its middle point

• At its centre of its cross sectional area

• Depends upon its material

A simple method to find centre of mass of a body is usage of

• stop watch

• plumbline

• pendulum

• gauge

Where do you hang the plumb line when determining the Centre of mass?

• It doesn't matter, because it always goes through the CG

• Only from the corners

• From the point where you are suspending the object

• At the right angle

If we suspend lamina at different positions, its centre of mass will still lie along the

• Plumb line

• Line of force

• Line of weight

• Gravity line

Center of gravity of an object depends on it's

• weight

• mass

• density

• shape

What is one way you might increase the stability of an object?

• Lower the center of gravity

• Raise the center of gravity

• Increase the height of the object

• Shorten the base of the object

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Do all objects have a centre of gravity?

• No objects have a centre of gravity

• Only some objects have a centre of gravity

• Only very heavy objects have a centre of gravity

• Yes all objects have a centre of gravity

Any object with mass has gravity.

• True
• Sometimes
• False
• Never

Tags

NGSS.HS-PS2-4

How is weight different from mass?

• Weight changes depending on gravity; mass stays constant throughout the universe.

• Weight is measured in grams; mass is measured in newtons.

• Weight can be converted to energy; mass cannot.

• Weight is measured with a scale; mass is measured with a triple-beam balance.