English
Tamil Nadu Board of Secondary EducationTamil Nadu Primary School Class 4

Rearrange the letters and find out the name of the tool.

Advertisements
Advertisements

Question

Rearrange the letters and find out the name of the tool.

R L E V E

______ ______ ______ ______
One Word/Term Answer
Advertisements

Solution

L E V E R
shaalaa.com
  Is there an error in this question or solution?
Chapter 3: Work and Energy - Evaluation [Page 112]

APPEARS IN

Samacheer Kalvi Science - Term 1 [English] Class 4 TN Board
Chapter 3 Work and Energy
Evaluation | Q II. | Page 112

RELATED QUESTIONS

What is an ideal machine?


Give a reason for the following.

Machines are able to make our work convenient.


Derive the relationship between mechanical advantage, velocity ratio and efficiency of a machine.


State the kind of lever which always has mechanical advantage less than 1. Draw a labelled diagram of such a lever.


Fig show a system of four pulleys. The upper two pulleys are fixed and the lower two are movable. 

(i) Draw a string around the pulleys. Also show the place and direction in which the effort is applied.

(ii) What is the velocity ratio of the system?

(iii) What is the mechanical advantage of the system?

(iv) What assumption do you make in arriving at your answer in part (iii)?


Fig. shows a spade. It is being used to lift soil weighing 30N from the ground.

(a)    Mark the direction of the least force on the handle necessary to keep the spade balanced. 
(b)    Calculate the least force on the handle necessary to keep the spade balanced (the weight of the spade is negligible).
(c)    If the left hand was move towards the soil on the spade, would the force on the handle necessary to keep the soil balance the greater or less? Give a reason for your answer.
(d)    To which class of lever does the spade belong?


Can a simple machine act as a force multiplier and a speed multiplier at the same time?


Write an expression for the mechanical advantage of an inclined plane.


Classify the following as a lever, a pulley and an inclined plane:

The wheel of a flagpole


Name a machine for each of the following uses:

  1. to multiply the force,
  2. to change the point of application of force,
  3. to change the direction of force,
  4. to obtain the gain in speed.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×