Module 2 Forces in action
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Newton's second law | net force = mass x acceleration
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| The newton | Unit of force. 1N is the force that gives a mass of 1kg an acceleration of 1m/s^2
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| Drag | The resistive force that acts on a body when it moves through fluid
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| Weight | The gravitational force acting on an object measured in Newtons
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| Terminal Velocity | The velocity at which an object's drag equals to it's accelerating force. therefore there is no resultant force and zero acceleration
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| Equilibrium | When the net force and net moment on an extended object is zero
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| Centre of gravity | this is the point where the entire weight of an object appears to act
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| Triangle of forces | If three forces acting at a point can be represented by the sides of a triangle, the forces are in equilibrium
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| Couple | This is a pair of forces that tends to produce rotation only. They are two forces that are equal in size but act in opposite directions but not in the same straight line
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| Torque of couple | The turning effect of a couple measured in Nm.
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| Moment of a force | The turning effect due to a single force. Calculated from the force multiplied by the perpendicular distance from a given point.
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| Principle of moments | For a body rotational equilibrium the sum of the clockwise moments equals to the sum of the anticlockwise
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| Density | the mass per unit volume
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| Pressure | Force per unit area
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| Thinking distance | The distance travelled from seeing the need to stop to applying the brakes
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| Braking distance | The distance travelled by a vehicle whilst decelerating to stop
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| Stopping distance | The distance a vehicle travels whilst decelerating to stop. The sum of the thinking distance and braking distance
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| Crumple zone | An area of a vehicle designed to increase the distance over which the vehicle decelerates and so reduce the average force acting
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
AliceP
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