topic 1: gravity and motion

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8 Terms

1
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what is the normal force?

a force that acts perpendicular to a surface to stop objects from going through the surface

2
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define period

the amount of time it takes for an object to complete one cycle

3
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define average speed

the rate of change of distance calculated by (distance/time)

4
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define centripetal acceleration

the acceleration experienced by an object travelling in circular motion, directed towards the centre of motion

5
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define centripetal force

the force acting on an object travelling in a circle that constantly pulls or pushed the object in towards the centre of motion

6
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define gravitational fields

the region of space surrounding a body in which another body experiences a force of gravitational attraction

7
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what is Keplers first law of planetary motion?

planets orbit in ellipses with the sun at one focus

8
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what is Keplers second law

planets sweep out equal areas in equal times