Term
| What shape is the orbit of a planet? |
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Definition
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Elliptical 
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Term
| State three ways the centripetal force can be increased. |
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Definition
- By increasing the mass of the object
- By increasing the speed of the object
- By decreasing the radius of the circle
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Term
| What is the name of the resultant force causing acceleration towards the centre of a circle? |
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Definition
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Term
| What does changing the acceleration of the object do? |
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Definition
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It changes the direction of the object's motion.
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Term
| What is the centripetal force on a whirling ball? |
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Definition
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The tension force on the string.
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Term
| What is the centripetal force on a turning car? |
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Definition
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The friction force on its tyres.
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Term
| When the distance between two objects increases, what happens to the force of gravity acting on them? |
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Definition
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It decreases - the two factors are inversely proportional.
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Term
| To stay in orbit at a particular distance, objects must ______________________________. |
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Definition
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To stay in orbit at a particular distance, objects must orbit at a particular speed which balances the gravitational force.
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Term
| The greater the mass of two objects, the ______ the force between them. |
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Definition
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The greater the mass of two objects, the greater the force between them.
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Term
| If you double the distance between two objects, what happens to the force between them? |
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Definition
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The original force is divided by 4.
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Term
| When you increase the distance from the Sun, what happens to the time taken for one orbit? |
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Definition
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Term
| What provides the centripetal force that keeps planets and satellites in orbit? |
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Definition
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Term
| What planet in the Solar System has the greatest gravitational pull? |
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Definition
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Jupiter. 
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Term
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Definition
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