s2w2 FC Conservation of momentum

Instructions

No review questions this week. Completion based, just do your best. 

1

Practice dimensional analysis. Given the following equation

Where

Find the units of the drag coefficient.

1

With the quest, we really haven't delved into the GUESS method of physics problems. These will be for both on level and honors, but I will start you out the same way. Consider the question: a child drops a ball from a height of 16 m. How fast is the ball going after 1 second. follow the steps in the "show your work" area to solve.

1

Honors only. Same question, but this time, see if you can work out how fast the ball is going right before it hits the ground.

1

Review: We have two different equations for Impulse. J stands for Impulse, p stands for momentum. capital i and m were already taken. take it up with the Germans. It's their fault.

notice that the second one uses the fact that p=mv to change Δp=mΔv. being able to plug and chug means being able to choose the proper equation to use. Remember from last week, one way to determine if you are getting it right it to pay attention to the units. looking at these equations, what are the units of Impulse?

5

Choose the most appropriate version of the impulse equation given the following scenario:

What is the impulse generated when a 53 kg cart is pushed with a force of 30 N to make it go from rest to 4 m/s?

5

Choose the most appropriate version of the impulse equation given the following scenario:

A 3 kg water balloon flies through the air at 5 m/s. If it lands on a cushion that takes 1.3 seconds to bring it to a stop, how much force is exerted on the balloon during the landing?

16

A 3 kg water balloon flies through the air at 5 m/s. If it lands on a cushion that takes 1.3 seconds to bring it to a stop, how much force is exerted on the balloon during the landing? Show all work using GUESS method and be sure to include units on your final answer.

16

Honors: What is the impulse generated when a 53 kg cart is pushed with a force of 30 N to make it go from rest to 4 m/s? Show all work using GUESS method and be sure to include units on your final answer.

1

A pair of figure skaters stand palms to palms waiting for their music to begin. They are motionless. What is the net force on the pair of skaters?

1

When the music begins the skater push off each other and move in opposite directions. For reasons of skating and convenience, we will say that all the energy that came from the push came from the larger male skater. He did not create the energy, the energy was transformed from one form into another. From what form to what form did the energy get transferred?

1

What is the Newton's third law force pair associated with the skater's push?

1

watch the following video on the conservation of momentum. What questions do you have?

1

The force of Mr. P on the ball is equal and opposite the force of the ball on Mr. P. They are a Newton's-3rd-law force pair

1

Which moved faster - Mr. P on the skateboard, or the ball?

1

which had greater mass, Mr. P or the ball?

1

Which has greater momentum, Mr. P or the ball?

1

Evil Mrs. Lenfest! that wasn't a fair, and will be super confusing when they get it wrong! I will ask a different way, and then you will get this answer right, and go change your wrong answer above. maybe. Which momentum has the greater MAGNITUDE, Mr. P or the ball?

1

Read the rest of Chapter 5 in your book. You should be starting in the section called "Conservation of momentum" do you have any questions?

1

Ok, so when you if a billiard ball hits another billiard ball and they ricochet away from each other in opposite directions, which of the following is true

1

Lets take out one of the balls. a 1 kg ball is heading towards a wall. it is going 3 m/s in a positive direction. using p=mv calculate the momentum (p) of the ball. When you calculate the momentum, be sure to use units.

1

ok, the ball hits. We are in ideal physics land, we lose no energy to friction, deformation, sound, nothing. all the kinetic energy is conserved. the ball has now bounced back with equal and opposite velocity. What is its momentum.

0

Remember that momentum is a vector. DIRECTION MATTERS. Once you are reminded of this, what is your response?

1

What is the Newton's-3rd-law force pair in the problem above?

1

How is momentum conserved if the momentum of the ball is positive before the collision and negative after the collision?

1

What if the ball didn't bounce. its made of playdough. it just... stops. if the ball isn't moving, its v=0, so its p=0. if momentum is conserved, what happened to the momentum the ball had before it hit the wall?

Practice dimensional analysis. Given the following equation Where Find the units of the drag coefficient.

Honors only. Same question, but this time, see if you can work out how fast the ball is going right before it hits the ground.

Choose the most appropriate version of the impulse equation given the following scenario:What is the impulse generated when a 53 kg cart is pushed with a force of 30 N to make it go from rest to 4 m/s?

Choose the most appropriate version of the impulse equation given the following scenario:A 3 kg water balloon flies through the air at 5 m/s. If it lands on a cushion that takes 1.3 seconds to bring it to a stop, how much force is exerted on the balloon during the landing?

A 3 kg water balloon flies through the air at 5 m/s. If it lands on a cushion that takes 1.3 seconds to bring it to a stop, how much force is exerted on the balloon during the landing? Show all work using GUESS method and be sure to include units on your final answer.

Honors: What is the impulse generated when a 53 kg cart is pushed with a force of 30 N to make it go from rest to 4 m/s? Show all work using GUESS method and be sure to include units on your final answer.

A pair of figure skaters stand palms to palms waiting for their music to begin. They are motionless. What is the net force on the pair of skaters?

What is the Newton's third law force pair associated with the skater's push?

watch the following video on the conservation of momentum. What questions do you have?

The force of Mr. P on the ball is equal and opposite the force of the ball on Mr. P. They are a Newton's-3rd-law force pair

Which moved faster - Mr. P on the skateboard, or the ball?

which had greater mass, Mr. P or the ball?

Which has greater momentum, Mr. P or the ball?

Evil Mrs. Lenfest! that wasn't a fair, and will be super confusing when they get it wrong! I will ask a different way, and then you will get this answer right, and go change your wrong answer above. maybe. Which momentum has the greater MAGNITUDE, Mr. P or the ball?

Read the rest of Chapter 5 in your book. You should be starting in the section called "Conservation of momentum" do you have any questions?

Ok, so when you if a billiard ball hits another billiard ball and they ricochet away from each other in opposite directions, which of the following is true

Lets take out one of the balls. a 1 kg ball is heading towards a wall. it is going 3 m/s in a positive direction. using p=mv calculate the momentum (p) of the ball. When you calculate the momentum, be sure to use units.

ok, the ball hits. We are in ideal physics land, we lose no energy to friction, deformation, sound, nothing. all the kinetic energy is conserved. the ball has now bounced back with equal and opposite velocity. What is its momentum.

Remember that momentum is a vector. DIRECTION MATTERS. Once you are reminded of this, what is your response?

What is the Newton's-3rd-law force pair in the problem above?

How is momentum conserved if the momentum of the ball is positive before the collision and negative after the collision?

What if the ball didn't bounce. its made of playdough. it just... stops. if the ball isn't moving, its v=0, so its p=0. if momentum is conserved, what happened to the momentum the ball had before it hit the wall?

Practice dimensional analysis. Given the following equation

Where

Find the units of the drag coefficient.

Choose the most appropriate version of the impulse equation given the following scenario:

What is the impulse generated when a 53 kg cart is pushed with a force of 30 N to make it go from rest to 4 m/s?

Choose the most appropriate version of the impulse equation given the following scenario:

A 3 kg water balloon flies through the air at 5 m/s. If it lands on a cushion that takes 1.3 seconds to bring it to a stop, how much force is exerted on the balloon during the landing?