Resultaten

In this chapter, we’ll use vectors to expand our understanding of forces and motion into two dimensions. Most real-world physics problems (such as with the game of pool pictured here) are, after all, either two- or three-dimensional problems and physics is most useful when applied to real physical scenarios. We start by learning the practical skills of graphically adding and subtracting vectors (by using drawings) and analytically (with math). Once we’re able to work with two-dimensional vectors, we apply these skills to problems of projectile motion, inclined planes, and harmonic motion.

You want a projectile to fly as far as possible, at which angle should you launch it? We'll start with formulas for the initial velocity.

Plotting projectile displacement, acceleration, and velocity as a function of time.

Figuring out the horizontal displacement for a projectile launched at an angle.

• Determine how each parameter (initial height, initial angle, initial speed, mass, diameter, and altitude) affects the trajectory of an object, with and without air resistance.
• Predict how varying the initial conditions will affect a projectile’s path, and provide an explanation for the prediction.
• Estimate where an object will land, given its initial conditions.
• Determine that the x and y motion of a projectile are independent.
• Investigate the variables that affect the drag force.
• Describe the the effect that the drag force has on the velocity and acceleration.
• Discuss projectile motion using common vocabulary (such as: launch angle, initial speed, initial height, range, time).

Visualising position, velocity and acceleration in two-dimensions for projectile motion.

• Predict, qualitatively, how an external force will affect the speed and direction of an object's motion.
• Explain the effects with the help of a free body diagram.
• Use free body diagrams to draw position, velocity, acceleration and force graphs and vice versa.
• Explain how the graphs relate to one another.
• Given a scenario or a graph, sketch all four graphs.

According to Creative Commons there are over 1.6 billion openly licensed teaching and learning resources available on the internet. Open Educational Resources (OER) are quality, free educational resources, that you can use without having to ask for permission, and that can be adapted to better suit local contexts and needs.

Many educators and developers don't know how to efficiently search for and identity useful resources. Some throw up their hands in horror and give up when tasked with finding suitable resources on the Internet. In this tutorial, we are committed to providing you with a search strategy for open content to ensure that you quickly find open resources. Let us begin!

On completion of this unit of study you will be able to:

• Decipher open licenses i.e. identify rights and permissions contained within Creative Commons licences attached to open content.
• Search for open content using common tools and filters such as on Google Advanced Search and the YouTube Creative Commons filter, as well as specialized services such as Creative Commons Search to find open media.

Speed necessary for the space station to stay in orbit.

• Describe a vector in your own words
• Explain a method to add vectors
• Compare and contrast the component styles
• Decompose a vector into components
• Describe what happens to a vector when it is multiplied by a scalar
• Arrange vectors graphically to represent vector addition or subtraction