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Flashcards in Chapter 3 Deck (23):
0

What is our speed relative to the sun?

107,000 km/hr

1

Speed is a measure of

How fast something moves

2

Speed is defined as

Distance covered per unit of time

3

Units of measurement for speed

Meters / sec

4

What is instantaneous speed?

The speed at any instance in time

5

What is avrg. Speed?

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

6

Speed is

Scalar
Only magnitude

7

Velocity is

A vector quantity
Both magnitude and Direction

8

Difference between velocity and speed

Velocity is speed in a given direction

9

Constant direction is a

So constant velocity is

Straight line

Motion in a straight line at a constant speed

10

What is instantaneous velocity

The avrg. Velocity over an really short time period

11

What is acceleration

The rate at which the velocity is changing

12

How do we Change the state of motion
(when does acceleratation occour)

Change in speed, direction, or both

13

Units of acceleration

m/s^2

14

Why did Galileo use inclined planes

To observe decreasing acceleration due to gravity
Because suitable timing devices weren't avaliable to him

15

Acceleration in the direction of velocity is referred to as

Speeding up

16

Acceleration against velocity is referred to as

Slowing down

17

Acceleration at an agle to velocity is referred to as a

Change of direction

18

When straight line motion is considered what is used interchangeably

Speed and velocity

19

The acceleration of an object in free fall is about

10 m/s^2

20

Free fall

An object moving under the influence of gravitational force only

21

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

Same

22

Gravity cause objects to accelerate towards

The centre of the earth
(downward )