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Physics > Motion > Flashcards

Motion Flashcards

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1
Q

What is rest?

A

If the position of an object does not change as time passes, then it is said to be at rest.

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2
Q

What is motion?

A

If the position of an object changes as time passes, then it is said to be in motion.

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3
Q

Can an object be at rest and in motion at the same time?

A

Yes, an object can be at rest with respect to one thing and in motion with respect to another at the same time.

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4
Q

What is the origin in motion?

A

To locate the position of an object, we have to choose a suitable reference point called the origin.

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5
Q

What is distance?

A

The distance travelled by an object is the length of the actual path traversed by the object during motion. It is a scalar quantity.

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6
Q

What is displacement?

A

The displacement of an object in motion is the shortest distance between the initial position and the final position of the object. It is a vector quantity.

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7
Q

Can distance travelled be zero or negative?

A

The distance travelled by an object in motion can never be zero or negative.

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8
Q

Can displacement be positive, zero, or negative?

A

The displacement of an object can be positive, zero, or negative.

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9
Q

Do distance and displacement have the same units?

A

Yes, both distance and displacement have the same units.

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10
Q

What is uniform motion?

A

An object is said to be in uniform motion if it travels equal distances in equal intervals of time, however small the intervals may be.

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11
Q

What is non-uniform motion?

A

An object is said to have non-uniform motion if it travels unequal distances in equal intervals of time.

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12
Q

What is speed?

A

Speed of a body is defined as the distance travelled by the body in unit time. The SI unit of speed is metre/second (m/s).

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13
Q

How is speed calculated?

A

If ‘s’ is the distance travelled by a body in time ‘t’, then its speed ‘v’ is given as v = s/t.

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14
Q

Is speed a scalar or vector quantity?

A

Speed of a body is a scalar quantity. It can be zero or positive but can never be negative.

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15
Q

What is uniform speed?

A

If a body covers equal distances in equal time intervals, however small the intervals may be, then it is said to have uniform speed.

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16
Q

What is non-uniform speed?

A

If a body covers unequal distances in equal time intervals, however small the intervals may be, then it is said to have non-uniform speed.

17
Q

What is average speed?

A

For bodies moving with non-uniform speed, we describe the rate of motion in terms of their average speed.

18
Q

What is velocity?

A

Velocity of a body is defined as the distance travelled by the body in unit time in a given direction.

19
Q

Is velocity a scalar or vector quantity?

A

Velocity of a body is a vector quantity. It can be positive, negative, or zero.

20
Q

What is uniform velocity?

A

A body is said to be moving with uniform velocity if it travels along a straight line, covering equal distances in equal intervals of time.

21
Q

What is non-uniform velocity?

A

A body is said to be moving with non-uniform velocity if it covers unequal distances in a particular direction in equal intervals of time.

22
Q

What is acceleration?

A

Acceleration of a body is defined as the rate of change of its velocity with time.

23
Q

Is acceleration a scalar or vector quantity?

A

Acceleration is a vector quantity. It can be positive, negative, or zero.

24
Q

What happens to acceleration when velocity increases?

A

If the velocity of a body increases, then the acceleration is positive.

25
Q

What happens to acceleration when velocity decreases?

A

If the velocity of a body decreases, then the acceleration is negative. Negative acceleration is called retardation.

26
Q

What is a distance-time graph?

A

The distance-time graph of a body moving with uniform speed is a straight line.

27
Q

What does the slope of a distance-time graph represent?

A

Speed of a body can be obtained from the slope of the distance-time graph.

28
Q

What is a velocity-time graph?

A

The velocity-time graph of a body moving with uniform velocity is a straight line parallel to the time axis.

29
Q

What does the area under a velocity-time graph represent?

A

The magnitude of displacement or distance travelled by the body is equal to the area enclosed by the velocity-time graph and time axis.

30
Q

What are the equations of motion?

A

The three equations of motion of a body moving along a straight line with uniform acceleration are: v = u + at, s = ut + (1/2) at², v² - u² = 2as.

31
Q

What is uniform circular motion?

A

When a body moves along a circular path with a uniform speed, its motion is called uniform circular motion.

32
Q

What is centripetal force?

A

The external force needed to make a body travel in a circular path is known as centripetal force.

Physics (1 decks)

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