Page 9 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020

PSPM SP015

PSPM CHAPTER 7: GRAVITATION
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Given mass of Earth = 5.98  10 kg and radius of Earth = 6.4  10 m

Gravitational Force

PSPM 2017/2018 SF016/2 No. 4(a)(i)

1. State Newton’s law of gravitation. [1 m]

PSPM 2009/2010 SF017/2 No. 3(a)

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2. Given the masses of the sun and the earth are 1.99 × 10 kg and 5.98 × 10 kg
respectively. Calculate the gravitational force between them when their centres are
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1.50 × 10 m apart. [2 m]

PSPM 2011/2012 SF016/2 No. 4(d)

3. x

m 2 m 1 m 3

15 m

FIGURE 7.1

FIGURE 7.1 shows a mass m 1 positioned between two masses, m 2 = 40 kg and
m 3 = 60 kg. m 2 and m 3 are separated by 15 m. m 1 is placed at a distance x from m 2.
(a) Sketch and label the forces acting on mass m 1 due to m 2 and m 3. [2 m]
(b) Determine x when m 1 will experience zero net gravitational force. [2 m]

Gravitational Field Strength

PSPM 2013/2014 SF016/2 No. 4(c)(i)

4. Define gravitational field strength. [1 m]

PSPM 2014/2015 SF017/2 No. 4(c)(ii)

5. Calculate the acceleration of Earth gravity at a distance of 500 km above the Earth
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surface. The radius and the mass of Earth are 6.4  10 km and 5.98  10 kg
respectively. [3 m]

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