A particle is moving in a circular path of radius r. The displacement after half a circle would be _______.

(a)

Zero

(b)

R

(c)

2 r

(d)

r / 2

Suppose a boy is enjoying a ride on a marry go round which is moving with a constant speed of 10 m/s. It implies that the boy _______.

(a)

at rest

(b)

moving with no acceleration

(c)

in accelerated motion

(d)

moving with uniform velocity

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

Distance travelled by a body in a given time

(a)

is always positive

(b)

can be zero or positive

(c)

is always negative

(d)

either (a) or (c)

Which of the following is correct

(a)

magnitude of displacement may be greater than distance

(b)

Distance is always greater than or equal to the magnitude of displacement.

(c)

Distance is always greater than the magnitude of displacement.

(d)

Both are scalar quantities.

If the velocity of an object increases with respect to time, then the object is said to be in_______ acceleration.

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positive

The slope of the speed–time graph gives _____

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non-uniform accelelation

In _______ equilibrium its centre of gravity remains at the same height when it is displaced.

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neutral

The SI unit of displacement is _____________

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metre (m)

The SI unit of speed is ___________

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m/s

Speed of ship

(1)

Equal distances covered in equal intervals of time

Centre of gravity of the geometrical shaped objects

(2)

Geometric centre

Stability

(3)

Knot

Uniform motion.

(4)

Unequal distance covered in equal interval of time

Non-uniform motion

(5)

Larger base area