7. Momentum and impulse Momentum:

Slides:

Advertisements

Similar presentations

Momentum and Impulse. What is Momentum? Momentum – The product of the mass and velocity of an object. Has magnitude and direction. Momentum = p = mv P.

Advertisements

Conservation of Momentum

Warm up. Physics Honors AB –Day 1/12/15-1/13/15 Momentum and Impulse.

Momentum and Energy in Collisions. A 2kg car moving at 10m/s strikes a 2kg car at rest. They stick together and move to the right at ___________m/s.

Conservation of Momentum

Section 73 Momentum.

Principles of Physics. - property of an object related to its mass and velocity. - “mass in motion” or “inertia in motion” p = momentum (vector) p = mvm.

AP Physics I.D Impulse and Momentum. 7.1 Impulse-Momentum Theorem.

Momentum Chapter 6. Momentum ► Related to inertia, not the same. ► Symbol is p ► p=mv ► Units of kgm/s ► What is the momentum of a 75kg rock rolling at.

Science Starter A 2 kg object moving east at 12 m/s collides with a stationary 6 kg object. After the collision, the 2 kg object bounces west at 6 m/s.

Momentum and Impulse Review 1.The velocity of a moving mass is called? ans: momentum 2.Force applied in a period of time is called? ans: impulse 3. The.

Elastic Collisions Inelastic Collisions

Chapter 6 Momentum and Impulse

Unit 8 Notes Momentum. p=mv In the last unit, we learned about conservation of energy. In this unit, we see conservation of momentum Momentum (p) is equal.

Chapter 6 Momentum and Impulse. Momentum The product of an object’s mass and velocity: p = mv Momentum, p, and velocity, v, are vector quantities, meaning.

Chapter 9 - Collisions Momentum and force Conservation of momentum

Chapter 7 Impulse and Momentum. 7.1 The Impulse-Momentum Theorem DEFINITION OF IMPULSE The impulse of a force is the product of the average force and.

Ch 7. Impulse and Momentum

Elastic Collisions Inelastic Collisions.  In a closed system, the total momentum of all objects in the system will remain constant  In other words…the.

Momentum Crashing Cars Water on Walls Hitting Tennis Balls Watching Skaters Fall.

Conservation of Momentum. CONSERVATION OF LINEAR MOMENTUM According to the law of conservation of linear momentum, the total momentum in a system remains.

Momentum. Collisions Perfectly inelastic collisions –When two objects stick together and move as one mass Elastic collisions –When two objects return.

Impulse, Momentum and Collisions. momentum = mass x velocity p = mv units: kgm/s or Ns.

Physics Section 6.3 Apply the physics of collisions Inelastic collision – two objects stick together after colliding. The two objects become one object.

Chapter 6 Momentum and Collisions 6-1 Momentum and Impulse Momentum(p) describes the tendency of an object to continue moving (or not moving) at a constant.

Momentum & Impulse Think of P as in Pmomentum. Momentum & Impulse Momentum = m x v, it’s a vector, P = m x v Remember F = ∆ P/ ∆ time = m ∆v/∆t = ma Impulse.

Collisions Inelastic vs. Elastic Pg. 233 – 239 Pg

1. What is the difference in elastic and inelastic collisions?

6-3: Elastic and Inelastic Collisions Objectives: Identify different types of collisions Determine the decrease in kinetic energy during perfectly inelastic.

Momentum Chapter 6. Momentum ► Related to inertia, not the same. ► Symbol is p ► p=mv ► Units of kgm/s 1. What is the momentum of a 75kg rock rolling.

Warm up A 3.00 kg crate slides down a 7 m ramp. The height of the ramp is 5 m off the ground. The velocity of the crate at the bottom of the ramp is 5.

Would you rather be hit by a tennis ball or a bowling ball?

Conservation of Momentum Elastic & Inelastic Collisions.

Chapter-7 Momentum and Impulse 1Momentum 2Impulse 3 Conservation of Momentum 4 Recoil 5 Elastic and Inelastic Collisions 6 Collisions at an Angle: An Automobile.

Momentum & Impulse. What does it mean to say “roll with the punches?” Why is it important to wear a helmet? Is it a good thing that cars basically crumble.

Friday phys 1-25 Momentum Collisions Energy. The Correct answer to #79 I was wrong! 2.8 m/s [SW] and 2.8 m/s [NE] Before =.64 kg m/s [e] After = HORIZONTAL.

Ch 6 Momentum and Collisions. Lab Day Objective In this chapter we will learn: – How to calculate momentum and impulse – Conservation of Momentum – Collisions.

Bell Ringer After reading the article Does slamming on the brakes save your brake pads? Do you believe this saves gas?

Elastic and Inelastic Collisions

Chapter 6. When objects collide their motion changes and this is the result of a concept called momentum. Momentum = mass x velocity p = mv kgm/s or Ns.

Momentum and collisions. What is momentum?  Momentum is the mass and velocity of a moving object. We find it mathematically using the formula: p = mv.

1. What is the difference in elastic and inelastic collisions?

Momentum The property of moving object has that makes it difficult to stop. (technically, product of mass and velocity) Formula: p = mv.

Momentum & Impulse For clickers.

Chapter 7 Impulse and Momentum.

Name 3 vectors and 3 scalars.

Chapter 9 Objectives: 1) Define momentum.

Physics Section 6.2 Calculate the momentum of collisions

Elastic Collisions.

Welcome Physics Pick up the two handouts at the front

Impulse and Momentum AP Physics B.

Writing Prompt: 10/26/2006 Predict what will happen if a 250 lb. safety runs into a 140 lb. punt returner who was standing still to catch a punt during.

Lesson 6.3 Elastic and Inelastic Collisions

Review Problems: Momentum & Impulse

Purpose: Definition of oblique collison.

THIS IS JEOPARDY.

Chapter 7 Impulse and Momentum.

Elastic Collisions.

2.3 Momentum Momentum:

MOMENTUM (p) is defined as the product of the mass and velocity -is based on Newton’s 2nd Law F = m a F = m Δv t F t = m Δv IMPULSE MOMENTUM.

SCI 340 L21 conservation of momentum

Chapter 7 Impulse and Momentum.

Collisions Momentum is always conserved in collisions

Momentum and impulse.

Lesson 8.5 Inelastic Collision In One Dimension

Presentation transcript:

7. Momentum and impulse Momentum: 𝑝=𝑚𝑣 (unit: kg m s-1) Change in momentum (∆𝑝) is called impulse (𝐼): ∆𝑝=𝐼=𝐹𝑡 Momentum is ALWAYS conserved!

Ex 1: What is the momentum of a hockey puck with mass 170 g moving at 10 m s-1?

Ex 2: Which action requires more force, to block the puck (m = 0,17 kg, u = 10 m s-1) or to catch it? Both actions take 0.10 s. https://im.mtv.fi/image/4508284/landscape16_9/1024/576/6b96fc3dd44ef2b34d3cb0cbd63bd9c2/ea/atte-engren-venaja-ottelussa.jpg (041217)

Ex. 3: A force of 100 N from a racket acts on a tennis ball (m = 0 Ex. 3: A force of 100 N from a racket acts on a tennis ball (m = 0.090 kg, u =20 ms-1) for 0.045 s. Calculate: The impulse The change in velocity The final velocity

8. Collisions Total momentum before and after the collision are the same! Inelastic collisions: Momentum is conserved Formula: 𝑚 1 𝑢 1 + 𝑚 2 𝑢 2 = 𝑚 1 𝑣 1 + 𝑚 2 𝑣 2 Elastic collisions: ”Perfect bounce” Momentum and kinetic energy conserved Totally inelastic collisions: ”Stick together” Formula becomes: 𝑚 1 𝑢 1 + 𝑚 2 𝑢 2 = (𝑚 1 + 𝑚 2 )𝑣 The direction is important!

Example 1: An ice skater (m = 49 kg) at rest catches a ball (m = 1 kg) with velocity 10 m s-1. What happens? Totally inelastic: 𝑚 1 𝑢 1 + 𝑚 2 𝑢 2 = (𝑚 1 + 𝑚 2 )𝑣 𝑚 1 =49 kg, 𝑢 1 =0 m s-1 𝑚 2 =1 kg, 𝑢 2 =10 m s-1 49 kg∙0 m s −1 +1 kg∙10 m s −1 =(49 kg+1 kg)∙𝑣 𝑣= 1 kg∙10 m s −1 49 kg+1 kg =0.2 m s −1 Answer: the skater (holding the ball) will start moving with 0.2 m s-1 in the same direction as the ball that hit her

Example 2: A car (m = 1000 kg, v = 100 km h-1) and a truck (m = 15 000 kg, v = 80 km h-1) collide head on and stick together. What happens? Totally inelastic: 𝑚 1 𝑢 1 + 𝑚 2 𝑢 2 = (𝑚 1 + 𝑚 2 )𝑣 𝑚 1 =1000 kg, 𝑢 1 =100 km h-1 𝑚 2 =15 000 kg, 𝑢 2 = - 80 km h-1 1000 kg∙100 km h −1 −15000 kg∙80 km h −1 =(1000 kg+15000 kg)∙𝑣 𝑣= 1000 kg∙100 km h −1 −15000 kg∙80 km h −1 1000 kg+15000 kg =−68.75 km h −1 Answer: The combined wreck will move at 69 km h-1 in the direction of the truck

P. 23: 7.1, 7.2, 7.3, 7.4, 7.5, (extra 7.7) P. 27-: 8.1 (b) means the first puck stops 8.2 8.3 8.4 the energy from the push is converted to kinetic energy shared between them 8.5 (extra 8.9)