Rise of the Machines by Eryk Gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn For Revision en-us 2017-03-22 06:40:38 UTC 2017-03-27 12:19:32 UTC hello@padlet.com Units for speed and acceleration eryk_gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161716706 Speed
- the rate of change of position.
Speed = Distance / Time.
Common units utilized for speed are meters per second (m/s) or miles per hour (mi/h).

The main difference between speed and velocity is that speed is a scalar quantity (does not depend on direction) whereas velocity is a vector quantity (which does depend on direction).

Acceleration
- Change of velocity over time. 
Force = Mass x Acceleration. 
Acceleration = Force / Mass. 
Common used units of acceleration are meters per second squared (m/s^2). ]]> 2017-03-22 06:47:21 UTC https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161716706 Push and Pull Forces eryk_gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161716878 You can’t see them, but forces make the world go round. Friction happens when two things rub against each other. Friction makes things slow down. It can also warm them up. Try rubbing your hands together. Are your hands warmer? Gravity is a natural force. It pulls everything down towards the earth.
When you push a friend on a swing, you are using another force. Pushing moves something in the direction of the push. The harder the push, the further the item goes. Pulling something has a similar action. The harder you pull, the faster something moves along. Pressure is another force. Pressure is force applied by weight. For example, if you press down on a grape, the pressure squishes it. Walk in snow and the pressure of your feet leaves footprints.
]]> 2017-03-22 06:49:41 UTC https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161716878 Normal Force: Definition eryk_gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161716982 the force that supports the weight of an object on a surface]]> 2017-03-22 06:50:59 UTC https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161716982 Speed divided by velocity = Distance divided by time eryk_gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161717114 speed/velocity = distance/time]]> 2017-03-22 06:52:37 UTC https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161717114 Understand that speed/velocity is the distance travelled in a specific time interval eryk_gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161718413 2017-03-22 07:08:41 UTC https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161718413 Weight as gravitational force eryk_gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161952509 Weight is measured in Newtons (N). Weight changes when on a different place. What does not change is your measure. Mass always stays the same. This is the formula to calculate weight:
Weight (N) = Mass (kg) x Gravitational force]]> 2017-03-22 19:34:23 UTC https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161952509 When force is applied on an object eryk_gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161953487 When force is applied on an object the object will move in the direction the force is applied on. So if you push an object forward, the object will go forward.]]> 2017-03-22 19:38:21 UTC https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161953487 Moments eryk_gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161961372 Forces can make objects turn if there is a pivot . Think of a playground. The pivot is the thing in the middle of it. When no-one is on the lake, it's level, but it's up. Turning forces around a pivot are called moments .

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Working out moments
To work out a moment , we need to know two things:

  • The distance from the pivot is the force is applied.

  • The size of the force applied

This is the equation for working out a moment:

Moment = force × distance

]]> 2017-03-22 20:09:25 UTC https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/161961372 Definition of Machines and Devices eryk_gruszecki https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/162778091 Machines-- devices which are mechanical in nature and involve considerable amounts of motion as part of their main function.

Devices-- tools that we use to carry out or simplify any task or job.]]> 2017-03-27 12:17:00 UTC https://padlet.com/eryk_gruszecki/gw1bj0t987yn/wish/162778091