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Force Diagrams. Forces. We know that a force can be a push or a pull acting on an object There is a good chance that 2 forces can be acting on an object at any one time Examples: Lifting something Dragging something Floating Globe.

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Forces
Forces

  • We know that a force can be a push or a pull acting on an object

  • There is a good chance that 2 forces can be acting on an object at any one time

  • Examples:

    • Lifting something

    • Dragging something

    • Floating Globe


Balanced forces

If two equal forces are applied to an object in opposite directions, the object does not move / or moves as a constant speed. This is called balanced forces.

Balanced Forces


Unbalanced forces

If two unequal forces are applied to an object in opposite directions, the object does move. This is called unbalanced forces.

And someone will win!!

Unbalanced forces


Unbalanced forces1
Unbalanced Forces

  • If the forces acting on an object are not balanced then the object with either:

    • Speed up

    • Slow down

    • Change direction

    • Chance its shape

      Fill in the Gaps sheet


We can use force diagrams to show this
We can use force diagrams to show this:

4N

7N

The block has 2 opposing forces being applied to it:

7N to the right and 4N to the left. They are Unbalanced Forces.

To Calculate the Resultant Force (Fr),

subtract one from the other: 7N – 4N = 3N to the right

3N


Problem

A man of mass 75kg has a weight of 750N. This 750N will act downward on the table and the table will exert a 750N force upwards on the man. The forces are balanced.

What would happen if the upward force were less than 750N?

Problem:

Force down 750N

Force up 750N


Your go
Your go: downward on the table and the table will exert a 750N force upwards on the man. The forces are balanced.

  • Collect Sheet: Drawing Force diagrams, fill in sheet finding Fr

  • Do Q6 p103 of text book

  • Lets have a tug of war!!


More on balanced and unbalanced forces
More on downward on the table and the table will exert a 750N force upwards on the man. The forces are balanced.Balanced and Unbalanced Forces:

  • Collect and complete the following worksheets:

    • More on Balanced and Unbalanced forces

    • Floating and Sinking (Read p101)

    • Parachutes (Read p101)

  • Extension Work:

    • Text book: Starting Science for Scotland Book 2, Read p22, Ans Q1-4

  • Base Jumping


Moments
Moments downward on the table and the table will exert a 750N force upwards on the man. The forces are balanced.


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