Today we were looking at the basics of physics i.e. force, gravity, pressure, velocity, distance, time, mass, weight, pivot, moment, balanced & unbalanced forces, friction etc
I worked with my textbook: KS3 Science (Terry Hudson) and with the BBC KS3 Bitesize section on forces. I also completed the review and test sections of the BBC KS3 Bitesize and got 6/6 and 11/12 respectively.
Some of the things I learnt about are the units these are measured in and the formulas that are used to work out word problems.
Force is measured in Newtons (N). Force is the push/pull action. Force is invisible but can be measured and you can see the effect that it has on objects. FORMULA: Force = mass x acceleration (Force on the earths surface = mass x acceleration due to gravity or F=mg)
Velocity is measured in m/s. FORMULA: Velocity = Distance /Time (v=d/t) I also learnt how to isolate the other parts of the formula depending on the information given in the word problem. i.e. distance = velocity x time and time = distance/velocity.
An example of a word sum for velocity is: If a bullet travels 1000m in 2 seconds, what is its velocity? To work this out is simple: v=d/t therefore v=1000m/2s so velocity = 500m/s. (Note the final units)
Some websites we looked at are:
http://www.schoolphysics.co.uk/age11-14/
http://www.physicsclassroom.com/
http://www.gcsescience.com/pfm.htm
http://www.middleschoolscience.com/formulas.pdf
Showing posts with label force. Show all posts
Showing posts with label force. Show all posts
Friday, 23 September 2011
Friday, 21 January 2011
Giant Rocket blasts off into space
Read the full article here and view the blast off video http://uk.news.yahoo.com/4/20110121/twl-giant-rocket-blasts-into-space-41f21e0.html
The Delta IV Heavy Launch Vehicle rocket has taken off from Vandenberg Air Force Base in California.
The Delta IV Heavy Launch Vehicle rocket has taken off from Vandenberg Air Force Base in California.
Friday, 26 November 2010
SCIENCE: FORCE
Force is measured in Newtons.
Upthrust is the force that pushes an object upwards when it is in a fluid (a liquid or gas). It is the
result of the difference in pressure exerted by the fluid on the surface of the object.
The upthrust, or buoyancy, keeps ships afloat.
The upthrust, or buoyancy, keeps swimmers on top of the water.
When you are standing on the ground gravity keeps you down but upthrust stops you from falling into the earths core. In a way upthrust makes things hard!! Because if it didn't exist solids wouldn't be solid.An objects density effects how it floats.
Density
------- = Mass
Volume
Upthrust is also called buoyancy. It is the upward force produced on an object in a fluid (such as air or water). The force is equal to the weight of the fluid displaced by the object.
If that weight is greater than the weight of the object, the object will float in the fluid. If it is equal, it will sit suspended. If it is less, it will sink, but the object will weigh less than it would in a vacuum. Hence, it is easier to pick up a heavy object in water than in air - the amount of displaced water weighs more than the equivalent volume of air, therefore water produces a greater upthrust.
References:
http://www.zephyrus.co.uk/upthrust.html
http://wiki.answers.com/Q/Explain_what_is_upthrust_force
http://wiki.answers.com/Q/What_is_upthrust
Upthrust is the force that pushes an object upwards when it is in a fluid (a liquid or gas). It is the
result of the difference in pressure exerted by the fluid on the surface of the object.
The upthrust, or buoyancy, keeps ships afloat.
The upthrust, or buoyancy, keeps swimmers on top of the water.
When you are standing on the ground gravity keeps you down but upthrust stops you from falling into the earths core. In a way upthrust makes things hard!! Because if it didn't exist solids wouldn't be solid.An objects density effects how it floats.
Density
------- = Mass
Volume
Upthrust is also called buoyancy. It is the upward force produced on an object in a fluid (such as air or water). The force is equal to the weight of the fluid displaced by the object.
If that weight is greater than the weight of the object, the object will float in the fluid. If it is equal, it will sit suspended. If it is less, it will sink, but the object will weigh less than it would in a vacuum. Hence, it is easier to pick up a heavy object in water than in air - the amount of displaced water weighs more than the equivalent volume of air, therefore water produces a greater upthrust.
References:
http://www.zephyrus.co.uk/upthrust.html
http://wiki.answers.com/Q/Explain_what_is_upthrust_force
http://wiki.answers.com/Q/What_is_upthrust
Monday, 8 November 2010
IN THE NEWS: Gale force winds and driving rain have been battering large parts of Scotland
Read about it on BBC News here
Last night the wind gusts were approx. 65 miles per hour which is 105 kilometers per hour. It was Gale Force 10/11 - on the western coasts and isles.
The Beaufort Wind Force Scale is a standardised measure for describing wind speed.
It is calculated by observing sea conditions.
It consists of a scale of thirteen increments (0 - 12) related to wind conditions that initially affected the sails of the 'Man-of-war' - the main British navy ship, at the time (1800's).
Over time it changed to accomodate storm effects on steam powered ships and land.
Today severe weather warnings given to the public are nearly the same as the Beaufort scale.
The scale is also used in the Shipping Forecasts broadcast on BBC Radio 4 in the United Kingdom.
The Beaufort Scale measures wind speed, wave height, sea / land conditions and has a marker number and a description. You can view it here
Here are a couple of images relating to this post:
References:
http://en.wikipedia.org/wiki/Beaufort_scale
Last night the wind gusts were approx. 65 miles per hour which is 105 kilometers per hour. It was Gale Force 10/11 - on the western coasts and isles.
The Beaufort Wind Force Scale is a standardised measure for describing wind speed.
It is calculated by observing sea conditions.
It consists of a scale of thirteen increments (0 - 12) related to wind conditions that initially affected the sails of the 'Man-of-war' - the main British navy ship, at the time (1800's).
Over time it changed to accomodate storm effects on steam powered ships and land.
Today severe weather warnings given to the public are nearly the same as the Beaufort scale.
The scale is also used in the Shipping Forecasts broadcast on BBC Radio 4 in the United Kingdom.
The Beaufort Scale measures wind speed, wave height, sea / land conditions and has a marker number and a description. You can view it here
Here are a couple of images relating to this post:
Man-of-war - An armed naval vessel, primarily one armed with cannon and propelled by sails.
Image source: http://www.saveon-kit-models.com/kit-model-ships.htm
Just for interest - Portuguese 'Man of War' Jelly Fish
It looks similar to the sails of the Portuguese fighting ship (Man of war)
Caravela redonda (an armed 4-sail caravel), of the 14th and 15th centuries
References:
http://en.wikipedia.org/wiki/Beaufort_scale
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