Force fields and Newton's law of gravitation Quiz
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5 questions, one answer each
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1. Two point masses attract each other with force F. One mass is doubled and the separation is also doubled. What is the new force?
- A. F/2
- B. F
- C. 2F
- D. F/4
2. What is the direction of the gravitational force on a small mass near a planet?
- A. Away from the planet
- B. Tangential to its surface
- C. Towards the centre of the planet
- D. It depends on the mass of the small body
3. Which statement about gravitational and electrostatic forces is correct?
- A. Only gravitational forces can repel
- B. Both obey inverse square laws
- C. Electrostatic forces act only on neutral bodies
- D. Gravitational forces are larger between electrons
4. Two uniform spheres have centres 2.0 m apart and radii 0.50 m each. Which value of r should be used in Newton's law?
- A. 1.0 m
- B. 1.5 m
- C. 2.0 m
- D. 3.0 m
5. The Moon pulls on the Earth with force F. What force does the Earth exert on the Moon?
- A. Much greater than F
- B. Equal to F
- C. Much smaller than F
- D. Zero, because the Moon is smaller