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Project of EDD-5161R Yue Ying Ho ( 98007310 ) Wong Bing Sze ( 98007710 )PowerPoint Presentation

Project of EDD-5161R Yue Ying Ho ( 98007310 ) Wong Bing Sze ( 98007710 )

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Motion under gravity Project of EDD-5161R Yue Ying Ho ( 98007310 ) Wong Bing Sze ( 98007710 ) Introduction I think you should have the experience of shooting a basketball. How can you describe the motion of the basketball ? Objectives Represent the motion of a basketball by a x-t graph

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- I think you should have the experience of shooting a basketball.

How can you describe the motion of

the basketball ?

Objectives

- Represent the motion of a basketball by a x-t graph
- Represent the motion of a basketball by a v-t graph
- Understand the relation between x-t and v-t graph

Construction of a X-T Graph

Height(x) /m

When the position of the ball is

recorded, a X-T graph is

formed.

X denotes displacement

(height ).

T denotes time taken.

Time(t) /s

T / s

0

Characteristics of a X-T Graphxo

X0is the maximum height reached by the ball.

Maximum

Height

to is the total time taken for the ball to go and return.

to

What is the time required for the

ball to reach the highest point ?

Total Time

T / s

0

X-T graph is symmetricxo

The time taken for

the ball to reach the

highest point should

be to/2

Maximum

Height

to

to/2

0

Construction of a V-T GraphVelocity(v) /ms -1

Displacement / m

Time(t) /s

Time / s

V denotes velocity ( how fast ).

T denotes time taken.

When the velocity of the ball is recorded, a V-T graph is

formed.

Velocity and v-t graph

Velocity / ms -1

The ball is moving upward,

the velocity is positive.

Time / s

The ball is moving

downwardsand the

velocity become negative

The ball reaches

the highest point,

the instantaneous

velocity iszero.

Speed and v-t graph

Velocity / ms -1

The speed of the ball is

reducing gradually.

It is decelerating.

Time / s

The speed of the ball is

increasinggradually.

It is accelerating .

The speed of the

ball is zero. It is

temporary at rest.

Time / s

0

Areas in v-t graphArea A equals to the

maximum height

reached by the ball.

A

B

Area B represents the

distance traveled by the

ball from the highest

point back to the ground.

Is there any relation between A and B ?

Time / s

0

Area in V-T graphArea A and B are the SAME !

It is because the basketball travels the same distance up and down .

B

B

B

B

A

B

B

B

Time / s

0

Slope in v-t graphWhat is the slope of this

straight line ?

vo

The slope of the v-t graph is the acceleration of the basketball.

to

Time / s

0

Slope in v-t graphThe slope of the v-t graph is :

- vo / to = -g

g is the gravitational acceleration and is approximately equal to 10 ms-2

vo

to

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