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8.3 Beyond Earth

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Question 21
H

A planet moves in a circular orbit around the Sun. The gravitational force from the Sun does not change the speed of the planet.

Why does the speed of the planet not change?

[1]
A

The gravitational force is balanced by an equal outward force on the planet

B

The gravitational force is too small to affect an object as massive as a planet

C

The gravitational force always acts at right angles to the planet's motion

D

The gravitational force only acts when the planet changes its direction

Markscheme

8.3 Beyond Earth Questions

  1. GCSE
  2. /Physics
  3. /8.3 Beyond Earth

50 exam-style questions on OCR GCSE Physics 8.3 Beyond Earth, covering 8.3.1 Red-shift and the expanding universe, 8.3.2 Evidence for the Big Bang model, 8.3.3 Formation of the Sun and stellar equilibrium, 8.3.4 Radiation emitted by hot bodies, 8.3.5 The solar system and satellites, 8.3.6 Gravity and circular orbits, 8.3.7 Orbital radius and orbital speed, 8.3.8 Radiation balance and the temperature of the Earth, and 8.3.9 Seismic waves and exploring hidden structures. Each one has a worked solution and a mark scheme showing where the marks go.

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