2. Structure and Force

Which are the correct definition of structure?

i. A load-carrying structure.

ii. A construction or arrangement according to the design that gives a pattern or organization.

iii. An arrangement and relations between the parts of the objects.

iv. Something built, arranged or organized

• ii and iv only

• i, ii and iii only

• i and iii only

• iii and iv only

Which of the following are true about the structure of satellites if the structure is neglected? Relate with force and pressure.

i. The structure is unable to withstand a harsh environment with the presence of radiation and vacuum in space.

ii. Weak structure can cope with the pressure when it is landing.

iii. The structure is able to withstand high force and pressure in space.

iv. High force and pressure in space will rupture and damage the satellite's payload.

• i and ii only

• i and iv only

• iii and iv only

• i, ii and iv

Below is the correct explanation on Force except...

• Force is a push or pull upon an object resulting from the object's interaction with another object.

• Force is a scalar quantity.

• The higher the force that acts on the object, the higher the effect that will be done by the object.

• Force is a vector quantity.

What are the factors that can disrupt a structure?

• Light

• Gravity

• Air resistance

• Pressure

Average sea-level pressure is ...

• 360 mmHg

• 101.3 kPa

• 101.13 Pa

• 1.01 atm

What are the common disturbances that happen to the spacecraft when launching?

• Noise disturbance

• Atmospheric pressure

• Rocket vibration

• Radiation

Why are we having difficulty breathing and feel exhausted when climbing a mountain?

• The molecule of oxygen collide with each other at high altitude

• At high altitudes, the outside air pressure is lower than it is inside our lungs, making it more difficult to pull in the thinner air and for our veins to pump oxygen throughout the body.

• The particles of oxygen do not exist at high altitudes and need some equipment to help humans to breathe

• Our body is too tired and needs some rest.

Which of the following are true about pressure?

i. The force applied perpendicular to the surface or amount of force exerted per area.

ii. Compression force acting on the beverage can area will result in the decrease of size.

ii. The higher the force exerted on the surface of an object, the higher the pressure acting on the object.

iv. The higher the altitude, the lower the air pressure occurs.

• i and ii only

• i,iii and iv

• i,ii and iii

• All true