materials

Question 1

what its the definition of tensile strength?

Answer 1

the stress at witch a material breaks or deforms prmenantly.

Question 2

what is the definition of ductility?

Answer 2

the extent to which a material can be deformed plastically without fracture.

Question 3

what is the definition of stiffness?

Answer 3

the resistance of an elastic body to deformation by an applied force. a material is brittle if it has little tendency to deform before fracture.

Question 4

what i the definition off elasticity?

Answer 4

this is the physical property of a material when it deforms under stress, but returns to its original shape when the stress is removed.

Question 5

what is the definition of plastic?

Answer 5

any material which undergoes a permanent change of shape when strained beyond a certain point.

Question 6

what is the definition of hardenss?

Answer 6

hardness gives high resistance to various different kinds of shape change when a force is applied.

Question 7

what is toughness?

Answer 7

toughness is the resistance to fracture of a material when stressed.

Question 8

if something is malleable, what does this mean?

Answer 8

capable of being shaped or formed, as by hammering or pressure.

Question 9

what is the young modulus?

Answer 9

the ratio of stress to strain.

Question 10

what ii the definition of density?

Answer 10

the degree of compactness of a solid. the density of a solid is defined as its mass per unit volume.

Question 11

what is the unit of density?

Answer 11

kilogram per cubic meter.

Question 12

how do you measure the density of a regular solid?

Answer 12

1) measure its mass using a top pan balance
2) measure it’s dimensions using a vernier calliper or a micrometer- use this to measure its fume using the appropriate equation.
4) calculate the density using m/v.

Question 13

how do you measure the density in a liquid.?

Answer 13

weigh out an empty measuring cylinder and then fill it with liquid, record the volume and then record the man of the cylinder + the liquid to calculate the mass of just the liquid.
the work out the density.

Question 14

how to you calculate the density of an irregular shape?

Answer 14

measure the mason the solid, then dangle it by a thread into a measuring cylinder and record the volume of water displaced. this is = to the volume of the shape. from this you can calculate the density of the object.

Question 15

what is hooks law?

Answer 15

how’s law states that the force needed to stretch a spring is directly proportional to the extension of the spring from its natural length.

Question 16

what are the aspects of hook’s law?

Answer 16

the greater the value f k, the stiffer the spring is. the unit of k is N/m
the graph F against change in l results in a gradient of k passing through the origin.

Question 17

what is the yield point of a wire?

Answer 17

the point at which the wire weakens temporarily.

Question 18

what happens at a wires ultimata tensile strength?

Answer 18

the wire loses its strength, extends, and becomes narrower at its weakest point

Question 19

what is the strength of a material?

Answer 19

the strength of a material is the ultimate tensile strength, which is its maximum tensile stress.

Question 20

wat is the area under the line of a force extension graph equal to?

Answer 20

the work done to stretch the wire.