Physics Homework [Forces 3]

Question 1

Define the limit of proportionality of an elastic object.

Answer 1

The maximum extension after which the elastic object no longer returns to its original shape and size after the applied forces are removed.

Question 2

Define spring constant.

Answer 2

The force required to extend (or compress) an elastic object by 1 m.

Question 3

When investigating how the force on a spring affects its extension, name the dependent variable.

Answer 3

Extension of the spring.

Question 4

State how the extension of an elastic object is calculated.

Answer 4

new length - original length.

Question 5

Define elastic deformation.

Answer 5

When an object returns to its original shape and size after the applied forces are removed.

Question 6

State the standard units for spring constant.

Answer 6

Newtons per metre (N/m)

Question 7

State the specific mathematical relationship between the force applied to a spring and the extension of the spring.

Answer 7

Directly proportional.

Question 8

Describe how the extension of a spring is measured.

Answer 8

By measuring the stretched length and subtracting the initial length.

Question 9

Describe the relationship between the force on an elastic object and its extension.

Answer 9

As the force on an elastic object increases, the extension increases.

Question 10

Define inelastic deformation.

Answer 10

When an object does not return to its original shape and size after the applied forces are removed.

Question 11

When work is done to extend or compress an elastic object, name the store of energy that increases.

Answer 11

The elastic potential energy store of the object.

Question 12

Rather than measure the extension of the piece of elastic, the student measures the whole length each time. Name the sort of error that will result from this.

Answer 12

A systematic error, all the results for extension will be too large.

Question 13

Define resultant force.

Answer 13

A singular force which has the same effect as all the individual forces acting on it.

Question 14

Describe how weight is measured.

Answer 14

Using a calibrated spring balance/newton meter.

Question 15

On a graph of force (on y-axis) against extension (x axis), describe how the spring constant can be caluclated.

Answer 15

From the gradient.

Question 16

When investigating how the force on a spring affects its extension, name the independent variable.

Answer 16

Force applied to the spring.

Question 17

If the forces on an object are balanced, give the resultant force.

Answer 17

0 N

Question 18

Identify the letter which shows the limit of proportionality of this elastic object.

Answer 18

C

Question 19

On a graph extension (on y axis) against force (x axis), describe how the spring constant can be calculated.

Answer 19

From the gradient, where spring constant = 1/gradient

Question 20

When investigating how the force on a spring affects its extension, name two variables that need to be controlled.

Answer 20

Temperature of the spring and spring constant of the spring.