Skating Flashcards

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0
Q

3 physical quantities of Motion

A

Position, Velocity & Force

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1
Q

Newton 1st Law of Motion

A

An object free of external forces moves at a constant velocity (either 0 (rest)/ straight line constantly)

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2
Q

Position

A

Measure of object’s location in space.
Need 1 snapshot determine position.
(“X” 7 feet in front of “B”, B 6 inches below X etc)

Need:

1) Object
2) Reference Point
3) Direction (from reference)
4) Distance (The Measurement)

I am 6 feet in front of the shelf

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3
Q

Vector Quantity

A

Physical quantities w/ amount & direction (how much & where in space)

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4
Q

Velocity

A

Rate at which object’s position changes w/ time (feet/second)
Need 2 snapshots determine (find direction line)

Need:

1) Amount- Speed
2) Directon

Measured in distance/time
= meters/second

The ball is travelling at 5m/second in front of me.

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5
Q

Force

A

Push/Pull (newtons)

1) Amount (how much force)
2) Direction

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6
Q

Acceleration

A

The rate at which object’s velocity (speed & direction) change w/ time.
Need 3 snapshots:
2 glances for velocity (2 positions) & 3rd to determine speed change (acceleration) or not.

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7
Q

Deceleration

A

Acceleration opposite your velocity’s direction (going down vs up the number line)

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8
Q

Turning

A

Acceleration to the side of velocity’s direction

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9
Q

Newton’s 2nd Law of Motion

A

Acceleration= net force/ mass or

Net force= mass• acceleration

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10
Q

Net Force

A

Sum of all forces acting on object.

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11
Q

Mass

A

Measure of Object’s Inertia (resistance change under motion)
- measured by its acceleration under given force
More mass = less acceleration

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12
Q

Inertia

A

Resistance object has to a change, in its state of motion (all objects in motion)
Ex. Bowling ball more inertia (more resistance & need more power to stop) than dropping feather.

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