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Physics > Chapter 3 > Flashcards

Chapter 3 Flashcards

0
Q

Speed is a measure of

A

How fast something moves

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1
Q

What is our speed relative to the sun?

A

107,000 km/hr

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2
Q

Speed is defined as

A

Distance covered per unit of time

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3
Q

Units of measurement for speed

A

Meters / sec

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4
Q

What is instantaneous speed?

A

The speed at any instance in time

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5
Q

What is avrg. Speed?

A

The distant travelled along its path divided by the time it takes to travel this distance

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6
Q

Speed is

A

Scalar

Only magnitude

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7
Q

Velocity is

A

A vector quantity

Both magnitude and Direction

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8
Q

Difference between velocity and speed

A

Velocity is speed in a given direction

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9
Q

Constant direction is a

So constant velocity is

A

Straight line

Motion in a straight line at a constant speed

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10
Q

What is instantaneous velocity

A

The avrg. Velocity over an really short time period

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11
Q

What is acceleration

A

The rate at which the velocity is changing

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12
Q

How do we Change the state of motion

when does acceleratation occour

A

Change in speed, direction, or both

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13
Q

Units of acceleration

A

m/s^2

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14
Q

Why did Galileo use inclined planes

A

To observe decreasing acceleration due to gravity

Because suitable timing devices weren’t avaliable to him

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15
Q

Acceleration in the direction of velocity is referred to as

A

Speeding up

16
Q

Acceleration against velocity is referred to as

A

Slowing down

17
Q

Acceleration at an agle to velocity is referred to as a

A

Change of direction

18
Q

When straight line motion is considered what is used interchangeably

A

Speed and velocity

19
Q

The acceleration of an object in free fall is about

A

10 m/s^2

20
Q

Free fall

A

An object moving under the influence of gravitational force only

21
Q

Accerlation is the ___ weather the object is going up or down

A

Same

22
Q

Gravity cause objects to accelerate towards

A

The centre of the earth

downward

Physics (9 decks)

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