Friday, December 23, 2016
Wednesday, December 14, 2016
THE SIX TYPES OF SIMPLE MACHINES
A simple machine increase the force applied to it. In other words, they produce an output force that is far greater than the input force. The ratio of the output force to the input force is referred to as the mechanical advantage.
Mechanical advantage = Output force
Input force
There are six simple machines.
Mechanical advantage = Output force
Input force
There are six simple machines.
- Lever
- Wheel and Axle
- Wedge
- Inclined plane
- Screw
- Pulley
LEVER: A lever is a simple machine that consists of a rigid object (usually a bar) and a fulcrum (or pivot). Applying a force to one end of the rigid object causes it to pivot about the fulcrum, causing a magnification of the force at another point along the rigid object. The applied force is known as the effort; the output force is the load; the point where there is no movement is the pivot (fulcrum). There are three classes of levers based on the positions of
the load, effort, and pivot.
First Class Machine: The pivot is between the effort and the load.
Second Class Machine: The load is between the effort and the pivot.
First Class Machine: The pivot is between the effort and the load.
Second Class Machine: The load is between the effort and the pivot.
Third Class Machine: The effort is between the pivot and the load.
CLASS (TYPE) OF LEVER EXAMPLES WHERE THE OCCUR IN HUMANS
WHEEL AND AXLE: A wheel is a circular device that is attached to a rigid bar in its center. A force applied to the wheel causes the axle to rotate and this can magnify the force.
Example is the Ferris Wheel.
INCLINED PLANE: An inclined plane is a plane surface set at an angle to another surface. This results in doing the same amount of work by applying the force over a longer distance.
Example is the ramp.
WEDGE: A wedge is a double-inclined plane (both sides are inclined) that moves to exert a force along the lengths of the sides. Examples: Axes, knives, and chisels.
SCREW: A screw is a shaft that has a in inclined groove along its surface. By rotating the screw, the force is applied perpendicular to the groove, thus translating a rotational force into a linear one. The rotational force is called a torque.
PULLEY: This is a wheel with a groove along its edge, where a rope or cable can be placed. It uses the principle that when force is applied over a longer distance it can reduce the magnitude of the necessary force need to perform some form of work.
Wednesday, December 7, 2016
MULTIPLE CHOICE QUESTIONS FOR THE WEEK
Multiple Choice
1. The density of an object is
a) The mass divided by the volume D = m/v
b) The volume divided by the mass D = v/m
c) The same as its weight
d) The same as the size of the object
2. If two objects have the same volume but one has a greater mass, the one with greater mass
a) Has a lower density
b) Has a higher density
c) Will float
d) Will sink
3. If two objects have the same volume but one is made up of smaller and heavier atoms, the one with small heavy atoms will
a) Be larger than the other
b) Be less dense than the other
c) Be more dense than the other
d) Float
4. If you cut a wooden block in half, each half would have
a) Half the density of the original piece
b) Twice the density of the original piece
c) The same density as the original piece
d) No density at all
5. In the water displacement method for finding volume
a) You subtract the final volume from the initial volume
b) You subtract the initial volume from the final volume
c) You add the initial and final volumes
d) You divide the final volume by 2
6. If two objects have the same mass but different volumes
a) The one with the larger volume has the lower density
b) They must have the same density
c) The one with the larger volume has the higher density
d) The one with the larger volume is twice as dense
7. If the density of water is 1 gram/cm3, this means that the mass of 100 cm3 of water should be
a) 100 grams
b) 50 grams
c) 1000 grams
d) 1 gram
8. Density is a characteristic property of a substance. This means that the density of water
a) Changes depending on the volume
b) Stays the same regardless of the volume
c) Is greater for a greater mass of water
d) Is less for a smaller mass of water
9. 100 milliliters of water has a mass of 100 grams. If you measured the mass of 50 milliliters of water, the mass would be
a) 25 grams
b) 200 grams
c) 100 grams
d) 50 grams
10. To find the mass of water in a graduated cylinder, you could
a) Take the total mass of the water and graduated cylinder and subtract the mass of the water
b) Take the total mass of the water and graduated cylinder and subtract the mass of the graduated cylinder
c) Add the mass of the water to the mass of the graduated cylinder
d) Take the total mass of the water and graduated cylinder and divide the mass by two
11. An object should float in a liquid if it is
a) More dense than the liquid
b) Less dense than the liquid
c) Lighter than metal
d) Shaped like a ball
12. A tiny piece of sand is very light but sinks in water. This is because
a) Sand is a solid
b) Sand is less dense than water
c) There is more water than sand
d) Sand is more dense than water
13. Wood floats in water. If you measured the mass of the same volume of wood and water
a) The water would have a greater mass
b) The water would have a lower mass
c) The mass of the wood and water would be the same
d) The mass of the wood and water would both be 100 grams
14. A candle floats in water but sinks in alcohol. This is because
a) The candle has less mass in alcohol
b) The water has less mass than the alcohol
c) The water is more dense than the alcohol
d) Water and alcohol are both liquids
15. Alcohol is less dense than water. If you measured the mass of the same volume of alcohol and water
a) The water would have a greater mass
b) The water would have a lower mass
c) The mass of the alcohol and water would be the same
d) The mass of the alcohol and water would cancel each other out
16. A carrot floats in salt water but sinks in fresh water. This is because
a) Salt water is more dense than fresh water
b) Fresh water is more dense than salt water
c) The carrot is more dense than salt water
d) A larger piece of carrot has a different density
17. The density of hot water
a) Is greater than the density of cold water
b) Is less than the density of cold water
c) The same as the density of cold water
d) Depends on the volume of water
18. The density of hot and cold water are different mainly because
a) The molecules in hot water move slower and are slightly closer together
b) The molecules in hot water are larger
c) The molecules in hot water move faster and are slightly further apart
d) The molecules in cold water move faster and are further apart
ANSWERS
1. a
2. b
3. c
4. c
5. b
6. a
7. a
8. b
9. d
10. b
11. b
12. d
13. a
14. c
15. a
16. a
17. b
18. c
1. The density of an object is
a) The mass divided by the volume D = m/v
b) The volume divided by the mass D = v/m
c) The same as its weight
d) The same as the size of the object
2. If two objects have the same volume but one has a greater mass, the one with greater mass
a) Has a lower density
b) Has a higher density
c) Will float
d) Will sink
3. If two objects have the same volume but one is made up of smaller and heavier atoms, the one with small heavy atoms will
a) Be larger than the other
b) Be less dense than the other
c) Be more dense than the other
d) Float
4. If you cut a wooden block in half, each half would have
a) Half the density of the original piece
b) Twice the density of the original piece
c) The same density as the original piece
d) No density at all
5. In the water displacement method for finding volume
a) You subtract the final volume from the initial volume
b) You subtract the initial volume from the final volume
c) You add the initial and final volumes
d) You divide the final volume by 2
6. If two objects have the same mass but different volumes
a) The one with the larger volume has the lower density
b) They must have the same density
c) The one with the larger volume has the higher density
d) The one with the larger volume is twice as dense
7. If the density of water is 1 gram/cm3, this means that the mass of 100 cm3 of water should be
a) 100 grams
b) 50 grams
c) 1000 grams
d) 1 gram
8. Density is a characteristic property of a substance. This means that the density of water
a) Changes depending on the volume
b) Stays the same regardless of the volume
c) Is greater for a greater mass of water
d) Is less for a smaller mass of water
9. 100 milliliters of water has a mass of 100 grams. If you measured the mass of 50 milliliters of water, the mass would be
a) 25 grams
b) 200 grams
c) 100 grams
d) 50 grams
10. To find the mass of water in a graduated cylinder, you could
a) Take the total mass of the water and graduated cylinder and subtract the mass of the water
b) Take the total mass of the water and graduated cylinder and subtract the mass of the graduated cylinder
c) Add the mass of the water to the mass of the graduated cylinder
d) Take the total mass of the water and graduated cylinder and divide the mass by two
11. An object should float in a liquid if it is
a) More dense than the liquid
b) Less dense than the liquid
c) Lighter than metal
d) Shaped like a ball
12. A tiny piece of sand is very light but sinks in water. This is because
a) Sand is a solid
b) Sand is less dense than water
c) There is more water than sand
d) Sand is more dense than water
13. Wood floats in water. If you measured the mass of the same volume of wood and water
a) The water would have a greater mass
b) The water would have a lower mass
c) The mass of the wood and water would be the same
d) The mass of the wood and water would both be 100 grams
14. A candle floats in water but sinks in alcohol. This is because
a) The candle has less mass in alcohol
b) The water has less mass than the alcohol
c) The water is more dense than the alcohol
d) Water and alcohol are both liquids
15. Alcohol is less dense than water. If you measured the mass of the same volume of alcohol and water
a) The water would have a greater mass
b) The water would have a lower mass
c) The mass of the alcohol and water would be the same
d) The mass of the alcohol and water would cancel each other out
16. A carrot floats in salt water but sinks in fresh water. This is because
a) Salt water is more dense than fresh water
b) Fresh water is more dense than salt water
c) The carrot is more dense than salt water
d) A larger piece of carrot has a different density
17. The density of hot water
a) Is greater than the density of cold water
b) Is less than the density of cold water
c) The same as the density of cold water
d) Depends on the volume of water
18. The density of hot and cold water are different mainly because
a) The molecules in hot water move slower and are slightly closer together
b) The molecules in hot water are larger
c) The molecules in hot water move faster and are slightly further apart
d) The molecules in cold water move faster and are further apart
ANSWERS
1. a
2. b
3. c
4. c
5. b
6. a
7. a
8. b
9. d
10. b
11. b
12. d
13. a
14. c
15. a
16. a
17. b
18. c
Tuesday, December 6, 2016
SOME POPULAR POST WORTH READING
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This is a season to stop, relax, recollect, ponder and take stock of the year's activities, Both failures and successes. A season...- Have you not known? Have you not heard? The everlasting God, the Lord , The Creator of the ends of the earth, Neither faints nor is ...
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Tuesday, November 29, 2016
A SEASON WITH A REASON - A TIME TO RELAX AND BE JOYFUL
This is a season to stop, relax, recollect, ponder and take stock of the year's activities,
Both failures and successes.
A season to climb to higher grounds and to leave behind the past.
A season with a reason yet abused and misused because of lack of knowledge.
It is a time to tap into your God-given strength through the birth of the giver of life,
the Lord Jesus Christ, the new born king!
He came into the world to take away all our, shame, sorrows and sins,
and to restore us back to the rightful place that God has purposed for our lives.
You were made to be a powerful and resourceful person.
Tap into your inner self and allow God to empower you and renew your energy for greater things in the coming days.
May this season bring you joy as the new born baby brought
JOY INTO THE WORLD!
MAY THE PEACE OF GOD BE WITH YOU THROUGHOUT THIS SEASON!
MAY ALL YOUR DREAMS COME TRUE.
RELAX and LET NOT your HEART be TROUBLED!
Wednesday, October 12, 2016
YOU CAN CHOOSE TO BE WHAT YOU WANT TO BE!
When life's seems to hit you in the face like raging storms,
When you seem to be discouraged by daily chores,
Take courage in your heavenly stores,
For there you will find strength in quantum bits.
Riches or poverty are choices to make,
Success or failure you can choose to be,
Only separated by a fine line of will.
Life and death are in the power of the tongue,
You can chose to be what you want to be.
Life's struggles are for a while,
Pursue knowledge and seek out for wisdom,
For success and riches are within your reach.
Never give up! Gird up your loins with endurance.
For persistence and perseverance will work the miracle.
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