"Momentum and Impulse" (9 класс)

Слайд #1

MOMENTUM AND IMPULSE

Слайд #2

MOMENTUM
𝒑 =𝒎 𝒗
SI Unit: 𝒌𝒈 𝒎 𝒔
Vector

Слайд #3

Momentum is a vector quantity. The momentum vector points in the same direction as the velocity vector.
© 2014 Pearson Education, Inc.
MOMENTUM
𝒑

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MOMENTUM
Greater mass, greater momentum

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MOMENTUM
Greater velocity, greater momentum

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MOMENTUM
540 kg m/s
20,000 kg m/s
-80 kg m/s

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MOMENTUM

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The total momentum of a system of objects is the vector sum of the momentums of all the individual objects:




© 2014 Pearson Education, Inc.
MOMENTUM

Слайд #9

Due to the vector nature of momentum, it is possible for a system of several moving objects to have a total momentum that is positive, negative, or zero.
© 2014 Pearson Education, Inc.
MOMENTUM

Слайд #10

IMPULSE -MOMENTUM
𝐹 𝑛𝑒𝑡 =𝑚 𝑎
𝐹 𝑛𝑒𝑡 =𝑚 ∆ 𝑣 ∆𝑡
𝐹 𝑛𝑒𝑡 ∆𝑡=𝑚∆𝑣
∆𝑣= 𝑣 𝑓 − 𝑣 𝑖

Слайд #11

IMPULSE -MOMENTUM
𝐹 𝑛𝑒𝑡 ∆𝑡=𝑚∆𝑣
𝐽 =∆ 𝑝

Слайд #12

IMPULSE -MOMENTUM
𝐹 𝑛𝑒𝑡 = 𝑚∆𝑣 ∆𝑡
𝐹 𝑛𝑒𝑡 =
𝑚∆𝑣
∆𝒕
𝐹 𝑛𝑒𝑡 =
𝑚∆𝑣
∆𝒕
𝐹 𝑛𝑒𝑡 =
𝑚∆𝑣
∆𝒕

Слайд #13

IMPULSE -MOMENTUM
HAYSTACK
CONCRETE WALL

Слайд #14

IMPULSE -MOMENTUM
𝑡↓,𝐹↑

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IMPULSE -MOMENTUM
𝐽 =∆ 𝑝
𝐽 = 𝑝 𝑓 − 𝑝 𝑜
𝑝 𝑜 + 𝐽 = 𝑝 𝑓

Слайд #16

𝑝 𝑜 + 𝐽 = 𝑝 𝑓
Qualitative Analysis Using Momentum Bar Chart

Слайд #17

A 2200 kg vehicle travelling at 26 m/s can be stopped in 0.22 sec if it hits a concrete wall. Draw a momentum bar chart to determine the net force on the vehicle.

Слайд #18

Rocio strikes a 0.058 kg golf ball with a force of 272 N and gives it a velocity of 62 m/s. Draw a momentum bar chart to determine how long Rocio’s club was in contact with the ball.