Download presentation
Presentation is loading. Please wait.
Published byAmbrose Stewart Modified over 9 years ago
1
DAILY QUESTION January 20, 2009 1. What is Newton’s 3 rd law?
2
Agenda1/20/09 Daily Question Ch 11 Section 3 Notes Assignments: 1. 11- 2 and 3 worksheet Test on Friday!
3
Newton’s 3 rd Law For every action force, there is an equal and opposite reaction force –Force always occurs in pairs (action and reaction) Equal size Opposite direction
4
Momentum A property of all moving objects Momentum = mass x velocity p = mv
5
Momentump=mv The more mass an object has the more momentum it has The more velocity an object has the more momentum it has Momentum has direction: it is in the direction of the velocity
6
Using the Momentum Equation Find the momentum of a 6.0 kg bowling ball moving at 10.0 m/s down the alley toward the pins. p = mvp= 6 kg x 10 m/s p = 60 kg-m/s down the alley
7
Momentum and Force Extending time it takes to change the momentum of the object decrease the force –Softball glove –Gymnasts –Air bags
8
Momentum and Force Which situation would do less damage to your car? Explain in terms of momentum. –Hitting a tree and completely stopping immediately OR –Hitting plastic barrels of water that spread the stopping process over a longer time
9
Momentum is conserved in collisions Law of conservation of momentum: the total amount of momentum in an isolated system is conserved. Momentum before = Momentum after Momentum can be transferred from object to object, but it always remains the same
10
Action and Reaction Force Pairs Page 365 Figure 22 Hand hit table with a force – table puts a force on your hand Bat exerts a force on the ball – the ball exerts a force on the bat Rabbit exerts a force on the ground – ground exerts a force on the rabbit
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.