# Motion

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Motion

## 1. Constant net force

### 1.1. equations

1.1.1. change of velocity is equal to the final velocity minus the initial velocity = acceleration times the change in time

1.1.2. refer to page 108 and 109

## 2. Visualization

### 2.1. Motion diagrams

2.1.1. position

2.1.2. velocity

2.1.3. Acceleration

3.2.1. neglible

## 4. Motion of projectiles

### 4.2. Projectiles

4.2.1. objects in free fall

4.2.2. motion takes place in vertical plane

### 4.3. Angle of elevation

4.3.1. angle of initial velocity above the horizontal

### 4.4. Trajectory

4.4.1. path it takes in air

## 5. Apparent Weight

### 5.2. elevator example

5.2.1. upwards the weight will be great than the true weight

5.2.2. downwards the weight will be less than the true weight

## 6. Air resistance

### 6.1. Drag force

6.1.1. increases as speed increases

6.1.2. the larger the surface area the more air is needed to be pushed out of the way

### 6.2. Terminal velocity

6.2.1. the acceleration is zero

### 6.3. Terminal speed

6.3.1. the magnitude of the terminal velocity is:

6.3.2. depends on:

6.3.2.1. size

6.3.2.2. shape

6.3.2.3. mass

## 7. Words of the Day

### 7.1. Forestall

7.1.1. to predict what is ahead

### 7.2. Modus operandi

7.2.1. "mode of operation"

### 7.3. Ne Plus ultra

7.3.1. the most profound degree

### 7.4. Ithaca

7.4.1. the journey

7.5.1. cures

### 7.6. Explore

7.6.1. To investigate systematically; examine

### 7.7. Red Herring

7.7.1. something intended to divert attention from the real problem or matter at hand

### 7.8. Mash-Up

7.8.1. combining data from more than one source into a single integrated tool

## 8. Acceleration

### 8.2. indicates any change in the velocity vector

8.2.1. change in direction

8.2.2. increase in speed

8.2.3. decrease in speed

8.2.4. simultaneous change in speed and direction

### 8.3. To find it:

8.3.1. the change in velocity divided by the corresponding time interval

8.3.2. meters per second squared

8.4.1. net force and velocity point in opposite directions=slowing down

8.4.2. Net force and velocity point in same direction= speeding up

8.4.3. Straight-line motion= acceleration is wither same direction as velocity or in the opposite direction to the velocity

9.3.1. Direction

9.3.2. Distance

## 11. Velocity

### 11.2. Average velocity

11.2.1. does not reveal information about the motion during the time interval

11.2.2. product of the vector, the displacement, and a positive scalar, the inverse of the time interval

11.2.3. x-axis

11.2.3.1. represented on the graph as x(t)

### 11.3. Instantaneous velocity

11.3.1. a vector

11.3.2. magnitude is the speed

11.3.3. direction of motion

11.3.4. used to calculate the displacement of the object during a very short interval

11.4.1. sloping portions on graphs indicate=movement

11.4.2. a horizontal position=position has not changed

11.4.3. steeper the graph=faster speed

11.4.4. sign of the slope indicates direction of motion

11.4.4.1. positive slope

11.4.4.2. positive slope=motion in the +x-direction

11.4.4.3. negative slope=motion in the -x-direction

## 12. Newton's second law

### 12.3. Applying to problems

12.3.1. Decide what objects will have Newton's second law applied to them

12.3.2. Identify all the external forces acting on that object

12.3.3. Draw a FBD to show all the forces acting on the object

12.3.4. Choose a coordinate system

12.3.5. find the net force by adding the forces as vectors

12.3.6. Relate the net force to acceleration

12.3.7. Relate the acceleration to the change in the velocity vector during a time interval of interest

## 13. Vectors

### 13.2. Problem solving

13.2.1. Vectors in different direction, Subtraction: is to add its opposite

13.2.1.1. has same magnitude but opposite direction

13.2.2. Multiplication

13.2.2.1. multiplyig a vector by the scalar -1 reverses the vector's direction while magnitude is unaffected

13.2.3. Subtraction : used to find displacement

### 14.1. Interval

14.1.1. The amount of time between two specified instants, events, or states

14.2.1. rise/run

### 14.3. Mass

14.3.1. measure of its inertia

### 14.4. Weight

14.4.1. is the magnitude of the gravitational force acting on it