3Basic definitions and equations of the kinematics of the uniform acceleration of a body

Differentiated additional tasks

(might be given as a group homework)

GROUP 1. Task 1.

Refer to the graph below. In the sentences below, fill in the blanks with these words/ numbers.

12.5 m/s                               faster                          stationary                  

velocity                                5 m/s                           displacement 

Displacement – Time Graph

Determining its velocity

1.      The gradient of a _________________– time graph gives us its velocity.

2.       Therefore for the first 5 seconds the speed is_____________.

3.      After the first 5 s the object is _____________ for 3 s. For these 3 s its _____________ is zero.

4.      After 8s the object starts to return at a ___________ speed than before. 

5.      From the graph we find the speed to be _______________.

GROUP 1. Task 2

 Refer to the graph below. In the sentences below, fill in the blanks with these words/ numbers.

displacement                       50 m/s²                                    25 m/s²                                    10 m/s²           

zero                          20 m/s²                                    acceleration                250 m

125 m                                   velocity                                   slope                                        125 m

Velocity – Time Graph

Determine its acceleration

1.      The _______________ of a velocity-time graph gives us its _____________________.

2.      Therefore for the first 5 s the acceleration is _________.

3.      When the object is at constant speed from 5s to 7s its acceleration is _____________.

4.      During the last second of the objects journey the object is decelerating at ________.

Determine its displacement
5. The area under a velocity-time graph is the ________________. During the first 5 s the object has travelled _____________.

Group 2. Task 1.

Determine the change in velocity
The area under the acceleration- Time graph gives us the change in  (1)____________.

From the graph we find that the change in velocity is (2)____________.

Acceleration – Time Graph

Group 2. Task 2.

Be able to relate how you move in front of a motion detector to the shape of the distance-time graph that's produced. Fill out this table to help get organized. 

Group 3. Task 1.

Fill in the boxes with words: constant speed,             slowing down,            accelerating and stationary.

Group 3. Task 2.

With this velocity-time graph, fill in the boxes with the word/s or phrase/s:

stopped,

 steady speed in the opposite direction,

 slows down – rapid deceleration,

speeding up- accelerating,

steady speed,

speeds up in opposite direction,

accelerates quickly,

accelerates slowly.

Answers to the additional tasks

Group 1. Task 1.

1.      Displacement

2.      5 m.s

3.      stationary

4.      velocity

5.      faster

6.      12.5 m/s

Group 1. Task 2.

1.      Slope, Acceleration

2.      10 m/s²

3.      zero

4.      50 m/s²

5.      displacement, 125 m

Group 2. Task 1

1        velocity

2        30 m/s

Group 3. Task

1.      Stationary

2.      Slowing down

3.      Constant speed

4.      Accelerating

5.      Accelerates slowly

6.      Accelerates quickly,

7.      steady speed

8.      slows down – rapid deceleration

9.      stopped

10.  speeding up, accelerating

11.  speeds up in opposite direction

12.  steady speed in the opposite direction

13.