• Inclined Plane
A common inclined plane is a ramp. Lifting a heavy
box onto a loading dock is much easier if you slide
th...
Lever
Any tool that pries something loose is a lever. A
lever is an arm that "pivots" (or turns) against a
"fulcrum" (or p...
Inclined Plane
5 N
5N
apply
force
apply
force
Inclined Plane
Decreases the size of the
effort force
5 N
5N
5 N
3 N
Inclined Plane
The size of the effort force on the incline is
still less than the vertical lift.
3 N
5N
5 N5 N
Inclined Plane
Basically, an incline plane allows you to
decrease the effort force applied by
increasing the distance of t...
Life, Force, and Motion
• Every time you move something,
use your pencil, or walk, you are
using force.
• Developing and g...
Mechanical Advantage
• Mechanical
advantage of an
inclined plane is
the length of the
slope divided by
the height of the
p...
Inclined Plane
• The mechanical
advantage of an
inclined plane is
equal to the length
of the slope divided
by the height o...
Tropisms
• A tropism is a growth response
involving bending or curving of a plant
part toward or away from an external
sti...
Phototropism
• Phototropism is the growth of stems of
plants toward light - it is probably the
best known of the plant tro...
Phototropism in plants
Light source
Phototropism: differential
stem growth Greater force
applied
Gravitropism
Gravitropism is a response to gravity -
if a seedling is placed on its side, the
root will curve to grow down...
Root Growth
• The main root of a plant typically
grows downwards towards earths
gravity.
• This downwards oriented growth ...
Going beyond   resource
Going beyond   resource
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Going beyond resource

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Going beyond resource

  1. 1. • Inclined Plane A common inclined plane is a ramp. Lifting a heavy box onto a loading dock is much easier if you slide the box up a ramp--a simple machine. • Wedge Instead of using the smooth side of the inclined plane, you can also use the pointed edges to do other kinds of work. For example, you can use the edge to push things apart. Then, the inclined plane is a wedge. So, a wedge is actually a kind of inclined plane. An axe blade is a wedge. • Screw Take an inclined plane and wrap it around a cylinder. Its sharp edge becomes another simple tool: the screw. Put a metal screw beside a ramp and it's kind of hard to see the similarities, but the screw is another kind of inclined plane.
  2. 2. Lever Any tool that pries something loose is a lever. A lever is an arm that "pivots" (or turns) against a "fulcrum" (or point). Think of the claw end of a hammer that you use to pry nails loose. It's a lever. Wheel and Axle Another kind of lever, the wheel and axle, moves objects across distances. The wheel, the round end, turns the axle, the cylindrical post, causing movement. Pulley Instead of an axle, the wheel could also rotate a rope or cord. This variation of the wheel and axle is the pulley. In a pulley, a cord wraps around a wheel. As the wheel rotates, the cord moves in either direction. Now, attach a hook to the cord, and you can use the wheel's rotation to raise and lower objects.
  3. 3. Inclined Plane 5 N 5N apply force apply force
  4. 4. Inclined Plane Decreases the size of the effort force 5 N 5N 5 N 3 N
  5. 5. Inclined Plane The size of the effort force on the incline is still less than the vertical lift. 3 N 5N 5 N5 N
  6. 6. Inclined Plane Basically, an incline plane allows you to decrease the effort force applied by increasing the distance of the effort force. 3 N 5N 5 N 5 N
  7. 7. Life, Force, and Motion • Every time you move something, use your pencil, or walk, you are using force. • Developing and growing plants use force to grow, reproduce, and survive. • These forces are examples of everyday life because that is what a force is, everyday life.
  8. 8. Mechanical Advantage • Mechanical advantage of an inclined plane is the length of the slope divided by the height of the plane, if effort is applied parallel to the slope • So for our plane MA = 15 feet/3 feet = 5 • Let’s say S = 15 feet, H = 3 feet MA = Length of Slope Height of Plane
  9. 9. Inclined Plane • The mechanical advantage of an inclined plane is equal to the length of the slope divided by the height of the inclined plane. • While the inclined plane produces a mechanical advantage, it does so by increasing the distance through which the force must move.
  10. 10. Tropisms • A tropism is a growth response involving bending or curving of a plant part toward or away from an external stimulus that determines the direction of movement • Response toward the stimulus is positive, and response away from the stimulus is negative • An unbalanced force is needed to carry out this biological process.
  11. 11. Phototropism • Phototropism is the growth of stems of plants toward light - it is probably the best known of the plant tropisms • phototropism is caused by elongation of the cells on the shaded part of the plant - so that entire plant bends or curves toward the light
  12. 12. Phototropism in plants Light source
  13. 13. Phototropism: differential stem growth Greater force applied
  14. 14. Gravitropism Gravitropism is a response to gravity - if a seedling is placed on its side, the root will curve to grow downward and the shoot will curve to grow upward
  15. 15. Root Growth • The main root of a plant typically grows downwards towards earths gravity. • This downwards oriented growth is termed gravitropism.

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