# Shared Flashcard Set

## Details

Circular motion
Circular motion and planetary orbits ^_^
14
Physics
04/25/2008

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