Day 3: 4.2 Forces that act on structures!

In physics, a force is defined as...

• Any push on an object

• A push or pull on an object

• A pull on an object

• The force is what gives a Jedi his power

Gravity is an example of

• Internal force

• External force

• A non-force

True or False: External forces act on an object from outside of the universe

• True

• False

True or False: external forces act on an object from outside of the object (i.e. Gravity)

• True

• False

Internal forces...

• act on an object from outside of the object

• act on an object from inside the object

• act on an object from inside and outside of the object

Which of the following is an example of the MAGNITUDE of a force?

• How BIG the force is - gentle breeze vs strong wind

• WHERE the force is coming from - wind blowing at your face or at your back

• Where does the force MEET the structure - wind gusts over the entire structure or just one place on the structure

Which of the following is an example of the DIRECTION of a force?

• How BIG the force is - gentle breeze vs strong wind

• WHERE the force is coming from - wind blowing at your face or at your back

• Where does the force MEET the structure - wind gusts over the entire structure or just one place on the structure

Which of the following is an example of the POINT/PLANE OF APPLICATION of a force?

• How BIG the force is - gentle breeze vs strong wind

• WHERE the force is coming from - wind blowing at your face or at your back

• Where does the force MEET the structure - wind gusts over the entire structure or just one place on the structure

Compression, tension, shear or torsion are all examples of:

• Gravity

• Internal forces

• External forces

A force that squeezes or presses something together is:

• compression

• tension

• shear

• torsion