Topic 3 and 4

Question 1

Mass

Answer 1

The amount of matter in a substance

Question 2

Primary Standard

Answer 2

The name given to a small cylinder of metal on which the kilogram is based ; equivalent to 1 KG

Question 3

Kilogram (kg)

Answer 3

The primary measurement of mass in SI, equal to 1000 grams; 1 KG is the primary standard for mass

Question 4

Balance

Answer 4

A device used to measure mass

Question 5

Forces

Answer 5

A push or pull, or anything that causes a change in the motion of an object

Question 6

Newton (N)

Answer 6

The standard unit of forces in the Systeme international d’ unites

Question 7

Force Meter

Answer 7

A scientific device used to measure force; also called a spring scale

Question 8

Gravitational Force

Answer 8

The force exerted by gravity on an object; measured in Newtons (N)

Question 9

Weight

Answer 9

The force of gravity exerted on a mass

Question 10

Force Diagram

Answer 10

A drawing that uses arrows to represent the direction and strength of one or more forces

Question 11

External Forces

Answer 11

Stresses that act on a structure from the outside

Question 12

Internal Forces

Answer 12

A force that acts on an object from the inside

Question 13

Deformation

Answer 13

The change in a structure when a force is acting on it

Question 14

Dead Load

Answer 14

The weight of a structure upon itself

Question 15

Live Load

Answer 15

The force or forces that act upon a structure that is not part of the structure

Question 16

Tension Forces

Answer 16

A force that pulls on a material and stretches it apart

Question 17

Tensile Strength

Answer 17

A measure of the largest tension force that a material can withstand before changing or pulling apart

Question 18

Compression Forces

Answer 18

A force that compacts or squeezes a material

Question 19

Compressive Strength

Answer 19

A measure of the largest compression force that a material can withstand before changing or pulling apart

Question 20

Shear Forces

Answer 20

A force that bends or tears a material by pushing parts of it in opposite directions

Question 21

Shear Strength

Answer 21

Measures the largest shear force a material can stand before breaking apart

Question 22

Torsion Forces

Answer 22

A force that acts upon a material by twisting its materials in opposite directions

Question 23

Torsion Strength

Answer 23

A measure of the largest torsion force a material can withstand and still be able to return to its original shape

Question 24

Bending Force

Answer 24

A combination of push and pull forces that results in a temporary curving change in the shape of some structures