motion and force Flashcards

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1
Q

it is impossible if

A

a body having constant velocity and variable acceleration

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2
Q

a body is thrown vertically upwards. if air resistance is taken to be in account then the time during which rises is

A

less then the time of fall

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3
Q

it is correct

A

a body with zero velocity will not necessarily have zero acceleration

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4
Q

it is not correct

A

-a body having zero velocity necessarily will have zero acceleration
-a body having uniform speed can have only uniform acceleration
-a body having non uniform velocity have zero acc

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5
Q

momentum of body can be changed by

A

force of air resistance if surface area of body is large

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6
Q

all moving body possess

A

momentum but not impulse if they are moving with uniform velocity

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7
Q

displacement

A

The displacement of an object between two points does not tell exactly how the object has actually moved between these points.

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8
Q

average speed

A

-When an object moves with a variable speed, we generally describe its motion in terms of average speed.
-Note that average speed tells us nothing about the different speeds and variations that may have taken place during the journey.

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9
Q

average speed

A

-When an object moves with a variable speed, we generally describe its motion in terms of average speed.
-Note that average speed tells us nothing about the different speeds and variations that may have taken place during the journey.
FORMULA: ๐ด๐‘ฃ๐‘’๐‘Ÿ๐‘Ž๐‘”๐‘’ ๐‘ ๐‘๐‘’๐‘’๐‘‘=๐‘‡๐‘œ๐‘ก๐‘Ž๐‘™ ๐‘‘๐‘–๐‘ ๐‘ก๐‘Ž๐‘›๐‘๐‘’ ๐‘๐‘œ๐‘ฃ๐‘’๐‘Ÿ๐‘’๐‘‘/๐‘‡๐‘–๐‘š๐‘’ ๐‘ก๐‘Ž๐‘˜๐‘’๐‘›

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10
Q

velocity

A

-The direction of velocity is the same as that of the displacement.
-A body moving with a constant speed in a circle has a variable velocity
-FORMULA: ๐ด๐‘ฃ๐‘’๐‘Ÿ๐‘Ž๐‘”๐‘’ ๐‘ฃ๐‘’๐‘™๐‘œ๐‘๐‘–๐‘ก๐‘ฆ =๐ท๐‘–๐‘ ๐‘๐‘™๐‘Ž๐‘๐‘’๐‘š๐‘’๐‘›๐‘ก/๐‘‡๐‘–๐‘š๐‘’ ๐‘ก๐‘Ž๐‘˜๐‘’๐‘›

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11
Q

formula

A
  1. t= s/v
    2.
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12
Q

Newtonโ€™s Law of Motion

A

Newtonโ€™s laws of motion are only applicable if an object moves with a velocity which is negligible compared to the speed of light, which is 3.0 x 108 ms-1

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13
Q

Newtonโ€™s First Law of Motion (inertia)

A

-It gives qualitative definition of force
-The inherent property of the body with which it cannot change its state of rest or of uniform motion unless acted upon by an external force, is called inertia. Hence, Newtonโ€™s first law of motion may also be called law of inertia.

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14
Q

Newtonโ€™s Second Law of Motion
( law of acceleration)

A

-It gives quantitative definition of force.
-When a force is applied on a body an acceleration is produced in the direction of force
and the magnitude of acceleration is directly proportional to the applied force and
inversely proportional to the mass of the body.

๐น โƒ—= ๐‘š๐‘Ž

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15
Q

Newtonโ€™s Third Law of Motion

A

-To every action there is an equal and opposite reaction
-action and reaction act on different bodies
-forces in
nature occur in pairs
-Single isolated force is not possible.
-In certain case of electrostatics and in springs Newtonโ€™s 3rd law fails.

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