Samacheer Kalvi 7th Science Term 1 Unit 2 Book Back Question and Answers:

Samacheer Kalvi 7th Standard Science Book Back 1 Mark and 2 Mark Question & Answers uploaded online and available PDF for free download. Class 7th New Syllabus Science Term 1 book back question & answer solutions guide available below for English Medium. Class Seventh Std Science English Medium Term 1 Unit 2 Force and Motion book back answers given below. Students looking for class 7th Term I Unit 2 Questions and Answers can check below.

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Samacheer Kalvi 7th Science Book Back Term 1 Unit 2 Solutions Guide PDF:

TN State Board Class 7th Science Subject Term 1 Unit 2 one mark and two mark solutions guide PDF available below.

Science – Term 1

Unit 2 Force and Motion

I. Choose the appropriate answer :

1. A particle is moving in a circular path of radius r. The displacement after half a circle would be
(a) Zero
(b) R
(c) 2r
(d) r/2
Answer:
(c) 2r

2. Which of the following figures represent uniform motion of a moving object correctly?

Answer:

3. Suppose a boy is enjoying a ride on a merry-go-round which is moving at a constant speed of 10 m/s. It implies that the boy is.
(a) at rest
(b) moving with no acceleration
(c) in accelerated motion
(d) moving with uniform velocity
Answer:
(c) in accelerated motion

4. From the given v-t graph it can be inferred that the object is

(a) in uniform motion Time
(b) at rest
(c) in non uniform motion
(d) moving with uniform acceleration
Answer:
(d) moving with uniform acceleration

5. How can we increase the stability of an object?
(a) lower the centre of gravity
(b) raise the centre of gravity
(c) increase the height of the object
(d) shorten the base of the object
Answer:
(a) lower the centre of gravity

II. Fill in the blanks :

1. The shortest distance between the two places is _______
2. The rate of change of velocity is _______
3. If the velocity of an object increases with respect to time, then the object is said to be in _______ acceleration.
4. The slope of the speed-time graph gives _______
5. In _______ equilibrium its center of gravity remains at the same height when it is displacement

Answer:

1. displacement
2. acceleration
3. positive
4. velocity
5. neutral

III. Match the following :

Answer:

1 – c; 2 – e; 3 – a; 4 -d; 5 – b

IV. Analogy:

1. velocity : metre/ second :: acceleration : _______
Answer:
metre/second²

2. length of scale : metre : : speed of aeroplane : _______
Answer:
knot

3. displacement / time : velocity : : speed / time : _______
Answer:
acceleration

V. Answer very briefly:

1. All objects having uniform speed need not have uniform velocity. Describe with the help of examples.
Answer:
An object moving in uniform circular motion is moving around the perimeter of the circle with a constant speed. While the speed of object is constant, its velocity is changing, Ex: Merry-go-round, roller coaster, planets orbiting the sun.

2. “She moves at a constant speed in a constant direction”. Rephrase the same sentence in fewer words using concepts related to motion.
Answer:
She moves in a straight line with constant velocity.

3. Correct your friend who says “The acceleration gives the idea of how fast the position changes”.
Answer:
There are two possible answers:
Velocity gives an idea of how fast the position changes or Acceleration gives an idea of how fast the velocity changes.

VI. Answer briefly:

1. Show the shape of the distance–time graph for the motion in the following cases.
a. A bus moving with a constant speed
b. A car parked on a roadside.
Answer:
(a) A bus moving with constant speed.

(b) A car parked on the roadside.

2. Distinguish between speed and velocity.
Answer:

3. What do you mean by constant acceleration?
Answer:
A body is said to have constant acceleration if it travels in a straight line and its velocity increases or decreases by equal magnitude in equal intervals of time.
Ex: the motion of a freely falling body.

4. What is the center of gravity?
Answer:
The center of gravity of an object is the point through which the entire weight of the object appears to act.

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