Mechanical Energy

Question 1

____ is said to be done whenever a force moves its point of application a distance in the direction of the force

Answer 1

Work

Question 2

work is a ___ quantity

Answer 2

Scalar

Question 3

If the force is at right angle to the displacement the force is said to be

Answer 3

Zero

Question 4

An object held in the air is said to do no work if

Answer 4

It wasn moved through a distance d

Question 5

A force is said to be conservative if

Answer 5

The force depends only on position and the workdone by the force on a particle moving btwn 2 positions depends on the initial and final positions

Question 6

Example of conservative force is

Answer 6

Elastic and gravitational

Question 7

An important feature of a conservative force is its

Answer 7

Recoverability

Question 8

An example of a non conservative force is

Answer 8

Friction

Question 9

_____ is device used for overcoming ___ at one end by application of effort on another end

Answer 9

Machine, load or resistance

Question 10

The ability of machine to overcome heavy load through small load iscalled

Answer 10

Mechanical advantage

Question 11

The MA is influenced byy

Answer 11

Friction in the parts

Question 12

A machine that has no friction is called an

Answer 12

Ideal machine

Question 13

Velocity ratio iss the ratio between the

Answer 13

Distance moved by the effort to the D moved by the load

Question 14

Velocity ratio is dependent on the ___ of the machine and independent of the ____

Answer 14

Geometry and friction

Question 15

The simplest machine is the___ based on the principle of ______

Answer 15

Lever, moments

Question 16

In the first order lever the fulcrum can be found

Answer 16

In between the load and effort(scissors,crownbar,plier)

Question 17

In second order lever the load is

Answer 17

In between fulcrum and effort (wheel barrow,,nutcracker)

Question 18

In the third order lever the effort is

Answer 18

In between the fulcrum and the load(arm or biseps and tongs)

Question 19

In a lever a special fact is that the

Answer 19

M.A=V.R

Question 20

The most used machine is the

Answer 20

Pulley

Question 21

In the first order lever velocity ratios

Answer 21

Are always greater than 1 but could be less thb or equal too

Question 22

In Second order lever M.A and Vr are always

Answer 22

Greater than 1

Question 23

In the third order V.R are always

Answer 23

Less than 1

Question 24

In a pulley system the V.R is always equal to the

Answer 24

Number of pulleys

Question 25

In a Pulley system M.A is proportionate to the

Answer 25

Number of pulleys

Question 26

In a pulley system the efficiency is also proportional to the

Answer 26

Number of pulleys

Question 27

In a wedge the MA increases with

Answer 27

Decrease in angle btween slant height

Question 28

In a screw jack the distance between 2 successive threads is the

Answer 28

Pitch

Question 29

The screw jack consists of a bar commonly known as

Answer 29

Tommy bar

Question 30

The V.R of Gear wheels is the ratio of

Answer 30

Driven/Driving