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WorksheetsGRAVITATION Physics Form 4
Total questions: 20
Worksheet time: 10mins
According to the Newton’s Universal Law of Gravitation, the force of gravity between two objects is directly proportional to
The distance between the objects.
The product of the masses of the objects.
The gravitational constant.
The square of the distance between the objects.
According to the Newton’s Universal Law of Gravitation, the force of gravity between two objects is inversely proportional to
the distance between the objects.
the product of the masses of the objects
the gravitational constant
the square of the distance between the objects
What is the reason for the motion of the Moon on its orbit?
The gravitational force exerted on the Earth by the Moon.
The gravitational force exerted by the Sun.
The gravitational force exerted by the Planets.
The gravitational force exerted on the Moon by the Earth
A satellite moves around the earth in its orbit and does not escape from the space because the satellite
becomes weightless
move in a vacuum.
always pulled by the earth gravitational force.
move with highest speed.
Diagram show a model car moving with the direction shown by the arrow around a horizontal circular track. The car travels too quickly and leaves the track at point P. Which direction A, B, C or D shown the correct path of the car?
A
B
C
D
The value of universal gravitational constant G depends on
The nature of material of two bodies.
The heat content of two bodies.
The acceleration of two bodies.
None of these.
What keeps an Earth satellite moving in its orbit?
A Gravitational attraction of Sun.
Burning of fuel.
Ejection of gases from the exhaust of the satellite.
Gravitational attraction between satellite and Earth.
A satellite moves around the Earth in its orbit and does not escape from the space because the satellite
Become weightless
Move in vacuum
Always pulled by the Earth gravitational force
Move with highest speed
“A force that make an object to follow a circular path with direction always towards the center of curvature.” Statement above is the definition of
Gravitational force
Escape force
Centripetal force
Gravitational field strength
What happen to the weight of the object if the mass of the 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
The force of gravity on a 50 kg woman is 500 N. The woman also exerts a gravitational force on the Earth. How large a force is this?
0 N
500 N
245 N
980 N
Newton’s Universal Law of Gravitation states that the gravitational force between two objects is directly proportional to the product of masses of the two objects and inversely proportional to
Distance between the two objects.
Square of the product of the body’s radii.
Square of the distance between the centres of the two objects.
Cube of the distance between the centres of the two objects
Kepler’s Third Law states
the orbit of a planet around the sun is an ellipse, with the sun at one focus.
the semi major axis is equal to the planet’s average distance from the Sun.
the square of the orbital period of a planet is directly proportional to the cube of orbital radius.
a line that connects a planet to the Sun sweeps out equal areas in equal times.
What shape is the path of a planet that surround the Sun?
Focus
Circle
Ellipse
Perihelion
Diagram shows two satellites, M and N, in different orbits around the Earth. The orbit of N is located further from the Earth than the orbit of M.
Which of the following comparison based on the Diagram is true?
Gravitational acceleration on N > Gravitational acceleration on M
Centripetal force on N > Centripetal force on M
Orbital period of N > Orbital period of M
Orbiting velocity of N > Orbiting velocity of M
Diagram 20 shows an illustration of Kepler’s Second Law. The planet took the same period to move from A to B as compared to moving from C to D through the orbit.
Which of the following is true?
Area of ABF is equal to Area of CDF
Area of ABF is more than Area of CDF
Average speed of planet from A to B is equal to average speed of planet from C to D.
Average speed of planet from A to B is less than average speed of planet from C to D.
Which of the following is true about geostationary satellite?
I It moves in the direction of the earth orbit.
II Its period of rotation is 24 hours.
III Its orbit is always above the same geographical
location.
IV It does not experience any gravitational pull.
I, II and III only
I and III only
II and IV only
I, II, III and IV
Which of the following statement is correct regarding geostationary satellites.
Satellite that moves around the Earth at changing orbit height
It is used to get the information for weather broadcasting, GPS and imaging the earth surface
Orbit period is 24 hours, same to the Earth orbit period
Its orbit must not always be above the earth quarter
Which of the following factors affects the escape velocity of an object from the surface of the earth?
Mass of earth
Gravity of satellite
Acceleration due to gravity
Mass of object
Which of the following statements about a geostationary satellite is true?
It always moves from east to west.
It remains stationary at any chosen fixed point over the Earth.
It has a linear speed equal to the speed of a point on the Earth’s equator.
It has the same orbital period as the Earth’s rotation on its axis.
