Advertisements
Advertisements
Question
A block of mass 10 kg is suspended from two light spring balances, as shown in the following figure.
Options
Both the scales will read 10 kg.
Both the scales will read 5 kg.
The upper scale will read 10 kg and the lower zero.
The readings may be anything but their sums will be 10 kg.
Advertisements
Solution
Both the scales will read 10 kg.
From the free-body diagram
K1x1 = mg = 10 x 9.8 = 98 N
K2x2 = K1x1
So, K1x1 = K2x2 = 98 N
Therefore, both the spring balances will read the same mass, i.e. 10 kg.
APPEARS IN
RELATED QUESTIONS
When a carpet is beaten with a stick, dust comes out of it. Explain.
A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because ______.
What is the other name of Newton’s first law of motion ?
Name the scientist who gave the laws of motion.
Is it possible for a particle to describe a curved path if no force acts on it? Does your answer depend on the frame of reference chosen to view the particle?
The figure shows a light spring balance connected to two blocks of mass 20 kg each. The graduations in the balance measure the tension in the spring. (a) What is the reading of the balance? (b) Will the reading change if the balance is heavy, say 2.0 kg? (c) What will happen if the spring is light but the blocks have unequal masses?
Consider a book lying on a table. The weight of the book and the normal force by the table in the book are equal in magnitude and opposite in direction. Is this an example of Newton's third law?
A reference frame attached to the earth
(a) is an inertial frame by definition
(b) cannot be an inertial frame because the earth is revolving around the sun
(c) is an inertial frame because Newton's laws are applicable in this frame
(d) cannot be an inertial frame because the earth is rotating about its axis.
State Newton's first law of motion.
How does Newton's second law of motion differ from the first law of motion?
A force of 600 dynes acts on a glass ball of mass 200 g for 12 s. If initially, the ball is at rest, find
- Final velocity
- Distance covered.
What do you mean by inertia of motion?
The greater is the __________ the greater is the inertia of an object.
Give two examples of the following:
Inertia of motion
Differentiate between gravitational mass and inertial mass.
Classify the types of force based on their application.
This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement 1: If you push on a cart being pulled by a horse so that it does not move, the cart pushes you back with an equal and opposite force.
Statement 2: The cart does not move because the force described in statement 1 cancel each other.
Match the following.
| Column I | Column II |
| a. Newton’s I law | propulsion of a rocket |
| b. Newton’s II law | Stable equilibrium of the body |
| c. Newton’s III law | Law of force |
| d. Law of conservation of Linear momentum | Flying nature of bird |
If the net force on an object is zero, what happens?
When does an object accelerate?
