A-LEVEL Physics: 4.2.3: Centre of Mass (SaveMyExams)

Question 1

What is the ‘Centre of Mass’?

Answer 1

The Centre of Mass of an Object is the Point at which the Weight of an Object Acts.

Question 2

For Symmetrical Objects with Uniform Density, the Centre of Mass is Located at the…

Answer 2

Point of Symmetry.

Question 3

The Position of the Centre of Mass of an Object Affects its…

Answer 3

Stability.

Question 4

When is an Object Stable?

Answer 4

An Object is Stable when its Centre of Mass Lies Above its Base.

Question 5

The Wider the Base of an Object, the ___ Stable it is.

Answer 5

More.

Question 6

The Narrower the Base of an Object, the ___ Stable it is.

Answer 6

Less.

Question 7

In a Uniform Gravitational Field, the…

Answer 7

Centre of Gravity is Identical to the Centre of Mass.

Question 8

When is the Centre of Gravity Identical to the Centre of Mass?

Answer 8

In a Uniform Gravitational Field.

Question 9

The Centre of Mass does Not Depend on the…

Answer 9

Gravitational Field.

Question 10

What does the Centre of Mass of an Object Not Depend on?

Answer 10

The Gravitational Field that the Object is in.

Question 11

The Centre of Gravity Depends on the… Why?

Answer 11

Gravitational Field. Because:

F=ma

F=Weight of the Object
a= Acceleration due to gravity

Question 12

When an Object is in Space, its Centre of Gravity Will be More Towards the Object with the…

Answer 12

Larger Gravitational Field.

Question 13

Explain the Location the Centre of Mass & Centre of Gravity of the Moon. (2)

Answer 13

-Centre of Mass: Close to Geometric Centre.

-Centre of Gravity: Slightly Displaced from Geometric Centre, Towards the Earth, because of the Strong Gravitational Force of the Earth on it.

Question 14

The Earth’s Stronger ___ ___ Pushes the Moons Centre of ___ Closer to the Earth.

Answer 14

Gravitational Field, Gravity.

Question 15

Since the Centre of Mass is a Hypothetical Point, it Can Lie ___ or ___ of a Body.

Answer 15

Inside, Outside.