Circular motion  How can a body moving at a steady speed be accelerating?  What is the direction of a centripetal force? 19-Dec-15.

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Presentation transcript:

Circular motion  How can a body moving at a steady speed be accelerating?  What is the direction of a centripetal force? 19-Dec-15

Newton’s first law

19-Dec-15 Action of a resultant force

19-Dec-15 Circular motion

19-Dec-15 Centripetal force

19-Dec-15 Newton’s cannon

19-Dec-15 Circular motion – notes An object stays at rest or moves at a constant speed in a straight line unless a resultant force acts on it. A resultant force must act on an object to change its direction of movement. To make an object move in a circle a force must act towards the centrs of the circle. This force is called a centripetal force.

19-Dec-15 The centripetal force needed increases a)As the mass or the speed of the object increases b)As the radius of the circle decreases.

19-Dec-15 Tasks: 1)Workbook page 107 2)Workbook page 105, Q6 2) P3.2.4 worksheet