Why can't an object be swung with a perfectly horizontal string (weight needs to be balance by vertical component of tension)
Conic circular motion Vertical Circular Motion Maximum height a object can be dropped from to complete a loop. Banked roads. Recap degrees and radians
Investigate how force affects speed (for constant r and m). How does r affect speed (for constant m and F) Proof of centripetal acceleration (a = v^2 / r ) Centripetal force (F = mv^2 / r) Homework - Examples of calculations using centripetal force (pg 32 Essential A2 Physics - Jim Breithaupt) Test on Newton's Laws, Momentum and Impulse - Questions from OCR Jan 2010 and June 2010
Introduction to Circular motion: What forces act on a rubber bung whirled in a circle? Weight (vertically down), tension (towards centre of circle) When a resultant force acts a right angles to the direction of motion then the object will move in a circle. This force is known as the CENTRIPETAL FORCE. E.g: Moon orbiting Earth (centripetal force provided by gravity) Car turning a corner (centripetal force provided by friction acting sideways on the car) Roller Coaster doing a loop - (centripetal force provided by reaction force of track on roller coaster car and weight (depending on where the car is)) Even though moving at a constant speed, because the direction is continuously changing the velocity must be continuously changing and hence there is an acceleration. This is known as CENTRIPETAL ACCELERATION and is also towards the centre of the circle as acceleration is always in the same direction as resultant force (F = ma) Introduction to Radians. Radian is defined as the angle subtended when the arc length is equal to the radius. Since there are 2xpi radians in the circumference there are 2pi radians in a complete circle. Therefore 360° = 2 pi radians. Revision of Newton’s Laws
Momentum and Impulse Questions from Practice in Physics:
Using Newton's 3rd Law to show how momentum is conserved in a collision.
Elastic Collision - one in which momentum is conserved AND Kinetic Energy is conserved Inelastic Collision - Momentum is conserved but Kinetic Energy is not. However, total energy must be conserved so energy is transferred to other forms such as heat. |
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