Forces And Elasticity

Question 1

What happens when you apply a force to an object?

Answer 1

it may stretch, compress, or bend.

Question 2

What is the exension of a spring?

Answer 2

Final length after streched- Original length

Question 3

What is elastic deformation?

Answer 3

Elastic deformation occurs when an object can return to its original shape and length after the force is removed.

Question 4

What is needed to cause an object to stretch, compress, or bend?

Answer 4

-To cause an object to stretch, compress, or bend, more than one force is needed.
-If only one force is applied, the object would simply move in the direction of the applied force, rather than changing shape.

Question 5

What is inelastic deformation?

Answer 5

Inelastic deformation occurs when an object does not return to its original shape and length after the force is removed.

Question 6

What happens when a force stretches or compresses an object?

Answer 6

work is done, transferring energy to the object’s elastic potential energy store

Question 7

What happens when an object is elastically deformed?

Answer 7

all the energy transferred to it is stored in its elastic potential energy store

Question 8

What is the relationship between force and extension in a stretched spring?

Answer 8

The extension of a stretched spring (or other elastic object) is directly proportional to the load or force applied.

Question 9

What is the equation representing the relationship between force and extension in a stretched spring?

Answer 9

Question 10

What factors affect the spring constant?

Answer 10

The spring constant depends on the material being stretched- a stiffer spring has a greater spring constant.

Question 11

Does the equation for force, spring constant and extension (F=ke) also work for compression?

Answer 11

-Yes, the equation also applies to compression, where e is the difference between the natural and compressed lengths (the compression).
- so it would be F=KC

Question 12

What is the limit of proportionality?

Answer 12

-the maximum force that can be applied to an object while the extension remains proportional to the force.
-the f=ke equation cannot be used after this limit has been reached

Question 13

What does this graph show?

Answer 13

-the graph shows force against extension for an elastic object
-it starts as a straight line (where the 2 are directly proportional), but curves once the limit of proportionality is reached