Worksheets3.1 Newton's Universal Law of Gravitation
Total questions: 11
Worksheet time: 19mins
You are talking to your friend who is sitting 1.5 m in front of you. If your mass is 60kg and your friend's mass is 50 kg, what is the gravitational force between you and your friend?
A 6.9 x 10-8 N
B 8.9 x 10-8 N
C 9.5 x 10-8 N
D 1.3 x 10-7 N
Two force of attraction between two spheres of masses M and m and radii R and r in contact is F. What is the force of attraction when the two masses are separated as shown in Diagram 2?
A 41 F
B 21 F
C 2F
D 4F
Two identical bowling balls attract each other with a gravitational force of
3.0 x 10-9 N. The mass of each of the bowling ball is 6.1 kg. What is the distance between their centres?
A 0.83 m
B 0.91 m
C 1.60 m
D 6.20 m
Which of the following shows correctly the variation of gravitational acceleration, g, with the distance from the centre of the Earth, r? [R is the radius of the Earth]
The gravitational acceleration on the surface of the Earth is g. What is the gravitational acceleration at a position 2R from the surface of the Earth? [R is Earth's radius]
A 91 g
B 41 g
C 21 g
D 2 g
The mass of Mars is 6.42 x 1023 kg. The acceleration due to gravity on its surface is 3.71 m s-2. What is the radius of Mars?
A 3.4 x 106 m
B 6.4 x 106 m
C 7.8 x 106 m
D 11.5 x 106 m
Which of the following statements is not a characteristic of gravitational force?
A It causes the same acceleration for different masses.
B It acts with the same force on different masses
C The force is always towards the centre of the Earth
D It complies with the inverse square law
A sphere with mass 100 kg is brought to the top of a mountain of height 6000 m. What is its weight there?
A 960 N
B 975 N
C 980 N
D 981 N
What is the mass of a planet with a radius of 3.39 x 106 m and a gravitational acceleration of 3.71 m s-2 on its surface?
A 2.7 x 1023 kg
B 3.8 x 1023 kg
C 4.7 x 1023 kg
D 6.4 x 1023 kg
Diagram 4 show satellite X at a height of 600 km above the surface of the Earth . The satellite revolves around the Earth with a period of 90 minutes. [The radius of Earth, R = 6400 km]
a) State Newton's Universal Law of Gravitation
b) State the type of orbit of satellite X
c) Based on Diagram 4, does the satellite have acceleration? Explain why.
Diagram 1 shows two masses attracting each other. If m1 : m2 = 2 : 3, then F1 : F2 is equal to
A 2 : 3
B 1 : 1
C 3 : 2
D 5 : 2
