Week 11 (Mar. 24 - 28)
Read: Newton's Laws of Motion (ASGv2 Chap. 21).
Key topics: newton's laws of motion, force addition, action-reaction pairs, free body diagrams,
PHY 201 Lecture: We will learn to use Newton's laws of motion to determine (i) the force on a wall when struck by a compressible ball, and (ii) the simple harmonic motion of a mass-spring system
Key topics: newton's laws of motion, force addition, action-reaction pairs, free body diagrams,
PHY 201 Lecture: We will learn to use Newton's laws of motion to determine (i) the force on a wall when struck by a compressible ball, and (ii) the simple harmonic motion of a mass-spring system
Homework:
Lab: Force and rotation (Ex. 20.3). You will be guided through the lab by the "Force and Rotation Lab" videos (see below). I would recommend that you watch these videos before coming to lab this week; they will greatly assist you in data collection and analysis.
Chapter 21: The following four videos introduce Newton's three laws of motion.
Force and Rotation Lab: In the next 13 videos, I walk you through the lab that we will be doing this week; Professors Kuehn and Schindler recorded ourselves carrying out this lab in the spring of 2020. Professor Schindler tells some jokes. I highly recommend watching these videos before coming to lab next week.
In the next five videos, I walk you through a few examples of how to use Newton's laws of motion. The first video deals with how to set up force diagrams involving weight and normal force.
Next is a problem involving tension forces exerted by strings or cords pulling on an object:
Next, a ramp problem involving friction, normal force, and weight:
What happens when more than one force pushes or pulls on an object? In the first video below, I explain Newton's approach to force addition.
In the next video, I show how to find the acceleration of an object when two forces are pushing on it.
What causes your car to accelerate when you hit the gas pedal? In the next video, I explain how the friction force exerted by the road on the tires is what "throws" your car forward when you hit the gas:
- Momentum and Force (Ex. 21.1),
- Bull-train collision (Ex. 21.2),
- Action-reaction pairs (Ex. 21.3)
- Two astronauts play tug-of war in outer space. Astronaut A has a mass of 200 kg. Astronaut B has a mass of 150 kg. Astronaut A pulls the rope connecting them with a force of 20 Newtons. (a) What is the acceleration of astronaut B? (b) What is the force acting on astronaut A? (c) What is the acceleration of astronaut A? (d) If the rope is 100 meters long when do the astronauts hit each other?
- A100 gram hockey puck slides across the ice at a speed of 10 m/s due east. A hockey player strikes the puck with a force of 30 Newtons for 0.01 seconds. The force is directed due west. What is the final velocity of the puck after the force is done acting? What if the force, instead was directed due north?
Lab: Force and rotation (Ex. 20.3). You will be guided through the lab by the "Force and Rotation Lab" videos (see below). I would recommend that you watch these videos before coming to lab this week; they will greatly assist you in data collection and analysis.
Chapter 21: The following four videos introduce Newton's three laws of motion.
Force and Rotation Lab: In the next 13 videos, I walk you through the lab that we will be doing this week; Professors Kuehn and Schindler recorded ourselves carrying out this lab in the spring of 2020. Professor Schindler tells some jokes. I highly recommend watching these videos before coming to lab next week.
In the next five videos, I walk you through a few examples of how to use Newton's laws of motion. The first video deals with how to set up force diagrams involving weight and normal force.
Next is a problem involving tension forces exerted by strings or cords pulling on an object:
Next, a ramp problem involving friction, normal force, and weight:
What happens when more than one force pushes or pulls on an object? In the first video below, I explain Newton's approach to force addition.
In the next video, I show how to find the acceleration of an object when two forces are pushing on it.
What causes your car to accelerate when you hit the gas pedal? In the next video, I explain how the friction force exerted by the road on the tires is what "throws" your car forward when you hit the gas: