Forces
A force is either a __________ or a _________
Push and pull
If an object has a mass of 0.5kg, what is its weight on Earth using the Grade 7 conversion from the notes.
5 N
A structure's ability to hold itself up is called this
Structural strength
This force squeezes or pushes parts of an object together
Compression
This is the force between two surfaces moving against each other
Friction
Name the three things that determine the effect a force has on a structure
Magnitude, direction, and location
Mass is measured using this unit
kg
A structure's ability to maintain its position when acted on by a force is called this
Structural stability
This force stretches or pulls something apart
Tension
Which surface would generally cause more friction when sliding a desk across it: a smooth laminate floor or a carpeted floor?
Carpeted floor
The unit used to measure force is called what?
Newton (N)
An astronaut travels from Earth to Mars. What happens to their mass and weight?
Their mass stays the same, but their weight changes because gravity is different.
Lowering the centre of gravity generally does what to an object's stability?
Increases the stability
This force pushes or pulls connected parts of a structure in opposite directions
Shear
What are two effects that friction can have on moving objects?
Slow objects down and create heat
This force pulls objects with mass toward other objects with mass
Gravity
If you add or remove matter from an object, this changes.
Mass
A structure is more stable when its centre of gravity is located in what part of the structure?
The lower half of the structure.
This force twists parts of an object or structure in opposite directions
Torsion
Friction can slow objects down and create this form of energy
Heat
Using the grade 7 approximation of gravity, what force does a 5kg object exert due to gravity?
50 N
A student breaks a 2kg block into two smaller pieces. What happens to the mass of each piece compared with the original block?
The mass decreases because matter was divided for each individual piece.
A tall, narrow tower is generally less stable than a shorter, wider tower because of this design difference.
The width of the base relative to the height.
A piece of cardboard is being torn apart by pulling its connected sections in opposite directions. Which internal force is being applied?
Shear
Why might a designer want to increase friction between two surfaces in a structure
To provide more grip or resistance and help prevent movement.