CLASS 9 GRAVITATION

Name the force that causes acceleration of an object moving along a circle and keeps the body moving.

• centripetal force

• centrifugal force

• repulsive force

• attractive force

Tags

NGSS.HS-PS2-1

For a given force acceleration is inversely proportional to the mass of an object.

A. The above statement is correct because F=ma

B.The statement is not correct because the value of g is constant.

• option A is wrong

• both option A and B are wrong because the reasons given are wrong

• only option A is correct

• both A and B are correct.

Tags

NGSS.MS-PS2-2

Which of the following Laws of Kepler did Newton use to calculate the force of attraction?

• Sun is situated at the centre of the orbit

• The orbit of the planet is ellipse

• The cube pf the mean distance of a planet from the sun is proportional to the square of its orbital period.

• The line joining the planet and the sun sweeps equal areas in equal interval of time.

Tags

NGSS.HS-PS2-4

The SI unit of G

• Ncm²/kg²

• Nm²kg²

• Nm²/kg²

• Nkg/m²

Tags

NGSS.HS-PS2-4

The SI unit of weight

• kg

• N/m²

• N

• N cm/s²

Tags

NGSS.HS-PS2-4

What is the gravitational force between two objects?

• attraction at large distance only

• attraction at small distance only

• attraction at all distances

• attraction at large distances but repulsive at small distances

Tags

NGSS.HS-PS2-4

A ball is thrown up, the value of g will be?

• zero

• negative

• positive

• negligible

Tags

NGSS.HS-PS2-4

The gravitational forces cause

• Tides

• Motion of moon

• none of these

• both a and b

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

The earth attracts the moon with a gravitational force of 10²² N.The moon attracts the earth with a gravitational force of

• less than 10²² N

• 10²² N

• Greater than 10²² N

• 10-²² N

Tags

NGSS.MS-PS2-4

The upward force exerted by water on an object in it is called

• pressure

• thrust

• buoyancy

• drag