Force and Motion

Samacheer Book Back Questions And Answers For Science Standard 7 Term 1 “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

2. 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

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

Answer: a

4. Suppose a boy is enjoying a ride on a merry go round which is moving with 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

5. What is one way you might 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

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 centre of gravity remains at the same height when it is displacement

Answers:
1. Displacement
2. Acceleration
3. Positive
4. Velocity
5. Neutral

III. Match the following:
1. Displacement                                                                    A. Knot
2. Light travels through vacuum                                           B. Geometric centre
3. Speed of ship                                                                    C. Metre
4. Centre of gravity of the geometrical shaped object         D. Larger base area
5. Stability                                                                             E. Uniform velocity

Answers:
1. C
2. E
3. A
4. D
5. B

IV. Analogy:
1. Velocity: metre/second:: acceleration : _____.
2. Length of scale: metre:: speed of aeroplane : _____.
3. displacement/time: velocity:: speed/time : _____.

Answers:
1. m/s²
2. Knot
3. Acceleration

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