SOALAN BERFORMAT SPM -Gravitation (Modul Pan Asia)

A satellite moves around the earth in its orbit and does not escape from the space because the satellite

• become weightless

• move in a vacuum

• always pulled by the earth gravitational force

• moves with highest speed

Diagram shows a toy car tied with a string and fixed at one end on the floor. When it swings at the same length from the nail, the car moves in a circle.

Which of the following can explain the above situation?

• There is a force acts in opposite direction with the car's weight

• There is a force acts as centripetal.

• There is a force acts in the direction of movement

• There is a force acts away from the centrenof circle.

Diagram shows two object A and B with mass m₁ and m₂ respectively. The distance between center of the objects is r and the gravitational force is F.

F will decrease if

• m₁ increases

• m₂ increases

• r increases

Diagram shows a girl whirling a pail horizontally.

What happen to the pail if the string suddenly breaks?

• Spiral away from her hand

• Fly directly away from the boy

• Fly directly towards the boy

• Fly off and follow the tangent to its circular path,

What happen to the weight of the object if the mass of Earth decreases one half from its original mass without changing its radius?

• Does not change

• Decreases to one half from original weight

• Decreases to one quarter from original weight

• increases double from original weight

Diagram shows two objects at distance, d. Gravitational force that acts is F=10N.

What is the value of F if the volume of each object doubles?

• 5N

• 10N

• 20N

• 40N

A man-made satellite move orbitting the Earth at 265km height from the surface of the Earth with speed 4 x 10³ ms^-1. What is the centripetal acceleration while its orbitting the Earth?

(Radius of the Earth= 6370km)

• 2.4 m s^-2

• 2.5 m s^-2

• 50.5 m s^-2

• 60.4 m s^-2

An object has weight 2 N on the surface of the Earth. What is its weight if it is brought to the height of 1500 km from the surface of the Earth?

[Radius of the Earth= 6370 km, g= 9.81 N kg^-1]

• 0.13 N

• 0.8 N

• 1.0 N

• 1.3 N

Diagram shows two satellites, S₁ and S₂ are orbitting Mars with radius R₁ and R₂ respectively.

What is the ratio of period S₁ and S₂ if the ratio of radius orbit S₁ and S₂ is 4: 9?

• 64: 729

• 16: 81

• 8: 27

• 2: 3

Diagram shows the position of satellite S₁, S₂ and S₃ orbiting earth.

[T is period and R is radius of orbit]

Which of the following statement is true?

• Gravitational force on all satellites are the same

• Ratios of $\frac{T^2}{R^3}$ for each satellite are constant

• All satellites have same period

• Force that acts on each satellite directly proportional to $\frac{1}{R}$