2135 words - 9 pages

Investigation of Different Variabes' Effect on the Rate of Bounce of a Squash Ball

Aim:

The aim of this experiment is to find out and observe how different

variables affect the rate of bounce on a squash ball. There are many

variables that affect the rate of this reaction such as the following:

1. Drop Height (Meters)

2. Surface (e.g. Grass, tarmac etc)

3. Temperature of ball (°C)

4. Drop/Throw (Force)

5. Air Drag

6. Angle*

7. Area

8. Mass of ball

9. Pressure of air in ball

10. Material of ball

Outcome:

Height of bounce between first and second bounce.

In my investigation I ...view middle of the document...

This force

is only small when the object is moving slowly, but gets larger as the

velocity of the object increases until, eventually, it equals the

accelerating force (the weight of the object), so that there is no

further acceleration. The object has then reached its terminal

velocity.

As the retarding force, the drag, depends on the viscosity of the

medium (for example, air, water), and also on the area of the object

facing the direction of fall, the terminal velocity of different

objects under different circumstances varies greatly. Clearly the

terminal velocity of a stone dropped through air will be very much

greater than that of a stone dropped through water, which again would

be much greater than that of a stone dropped through syrup. The

parachute is an example of a device in which the area of the falling

object is artificially increased to lower the terminal velocity, and

free-falling parachutists spread their limbs or pull them together in

order to make themselves fall slower or faster before they finally

open their parachutes.

Acceleration - Also known as linear acceleration, rate at which the

velocity of an object changes per unit of time. Velocity is defined as

a vector-that is, it has both magnitude and direction. It follows that

an object accelerates if its speed changes, or its direction of

motion, or both. An object that is released and allowed to fall freely

accelerates downwards. An object tied to a string and swung at a

constant speed in a circle above a person's head also accelerates

uniformly; in this case, the acceleration is in the direction along

the string towards the person's hand.

When an object's speed decreases, it is said to decelerate.

Deceleration is negative acceleration.

An object accelerates only when a force is applied to it. According to

Newton's second law of motion, the change in speed is directly

proportional to the force applied (see Mechanics). A falling body

accelerates because of the force of gravitation.

Angular acceleration is distinct from linear acceleration. The angular

velocity of a rotating body is its rate of rotation-measured in, say,

revolutions per second-around a given axis. An angular acceleration is

a change in the angular velocity, which means a change in the rate of

rotation or in the direction of the axis.

Drag & Aerodynamics

The shape of an object drastically affects the degree to which air

resistance, or drag, impedes the object's motion. For example, a

sphere, top, and especially a square, bottom, both force the air to

redirect itself, slowing the objects down. An aerofoil, middle,

disturbs the air minimally as it travels, and so experiences little

drag.

[IMAGE]

Speed, distance travelled by an object in unit time. The SI unit for

speed is metres per second (m/s), and the most used...

Beat writer's block and start your paper with the best examples