Skating

Question 0

3 physical quantities of Motion

Answer 0

Position, Velocity & Force

Question 1

Newton 1st Law of Motion

Answer 1

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

Question 2

Position

Answer 2

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

Question 3

Vector Quantity

Answer 3

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

Question 4

Velocity

Answer 4

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.

Question 5

Force

Answer 5

Push/Pull (newtons)

1) Amount (how much force)
2) Direction

Question 6

Acceleration

Answer 6

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.

Question 7

Deceleration

Answer 7

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

Question 8

Turning

Answer 8

Acceleration to the side of velocity’s direction

Question 9

Newton’s 2nd Law of Motion

Answer 9

Acceleration= net force/ mass or

Net force= mass• acceleration

Question 10

Net Force

Answer 10

Sum of all forces acting on object.

Question 11

Mass

Answer 11

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

Question 12

Inertia

Answer 12

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.