6.1 State that a force may produce a change in size and shape of a body.
6.2 Describe the ways in which a force may change the motion of a body.
•Force can produce a change in:
- Shape:- (length, width, etc…) but can't change mass.
- Change velocity; i.e. (acceleration, direction, speed)
- Hook's :- Law[change in shape especially in springs]
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6.10 Terminal velocity
- Describe qualitatively the motion of bodies falling in a uniform gravitational field with and without air resistance (including reference to terminal velocity).
- Describe the forces acting on falling objects and explain why falling objects reach a terminal velocity. Use graphs
Did Felix speed increase in the same rate as the acceleration due to gravity; 9.8 m/s.s?
If an object is falling through a fluid, e.g. air or water, as its speed increases the drag on it will also increase. Eventually a speed is reached where the upward force will equal the weight of the object. As there is no net force on the object the acceleration will be zero. The object will fall at a constant
velocity. This velocity is called the terminal velocity. Similarly for a car, or other vehicle, when it reaches a speed where the sum of all the forward forces, i.e. the thrust = the sum of all the resistive forces, i.e. the drag, the vehicle will move at a terminal velocity. |
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Why do meteors burn when they enter the earths atmosphere?
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Click the following link to study the ballancing and unballancing forces?
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