O-LevelPhysicsForces5054/21 · Oct/Nov 2020 · Q25 Marks
Fig. 2.1 shows a satellite moving at a constant speed in a circular orbit around the Earth. [Figure 2.1] Speed is a scalar quantity but velocity is a vector quantity.
- (a)State how a scalar quantity differs from a vector quantity.[1]
- (b)Underline every vector quantity in the list. distance displacement force length mass time[1]
- (c)(i)There is a resultant force acting on the satellite in Fig. 2.1. Explain how the motion of the satellite shows that a resultant force is acting on it.[2]
- (c)(ii)State the cause of this force.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [B1] it / a scalar does not have a direction
- [B1] displacement and force underlined
- [B1] direction (of motion) is changing
- [B1] velocity is changing (with time) or it is accelerating (which requires a resultant force)
- [B1] gravitational attraction / field of the earth
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