Fundamental Quantities and Units

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Fundamental Quantities and Units - PowerPoint PPT Presentation

Fundamental Quantities and Units. Fundamental Quantity MKS Unit * Length (Meters) * Mass (Kilograms) * Time (Seconds). Motion. Motion. The symbol “ Δ ” means “Change in”. Motion. The symbol “ Δ ” means “Change in”. The speed changes by 4 m/sec every second.

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Fundamental Quantities and Units

Fundamental Quantity MKS Unit

* Length (Meters)

* Mass (Kilograms)

* Time (Seconds)

Motion

The symbol “Δ” means “Change in”

Motion

The symbol “Δ” means “Change in”

After 1 sec v = 7 m/sec

After 2 sec v = 11 m/sec

After 1 sec v = 7 m/sec

After 2 sec v = 11 m/sec

After 3 sec v = 15 m/sec

Motion

Relationships

If a = 0

d = vt

If a ≠ 0

d = ½ a t2

Motion

An object is thrown vertically upward from the surface of the earth in the absence of air resistance.

Note: this can be accomplished, for example, in an experimental facility from which the atmosphere has been removed.

1. What is the acceleration of the object on its way up?

2. What is the acceleration of the object on its way down?

3. If the object is thrown vertically, it will stop at the highest point in its motion. What is the acceleration of the object at the moment that it stops?

Motion

Air Hockey

There is no friction between the puck and the table surface

Motion

Free Fall Tower

d

Drop distance - d

100 m

y

Height above base - y

Assumption: No air resistance

Motion

1. Assume the air hockey puck moves with an initial speed of 10 m/s. What is its position (assume it starts a 0 m) after 1 s, 2 s, 3 s, 4 s and 5 s?

2. Assume the Free Fall Tower is 100 m high. What is the drop distance and the height above the base after 1 s, 2 s, 3 s, 4 s and 5 s? Assume g = 10 m/s2 .

Motion

Can be a combination

Motion

Can be a combination

d = ½ a t2

Motion

Can be a combination

d = v t

d = ½ a t2