5.3 Accelerate Your Understanding: Uniform Motion and Deceleration

• Science
• Middelbare school
• vwo
• Leerjaar 2

Accelerate Your Understanding: Uniform Motion and Deceleration

Book NOVA 1/2B

Chapter 5 Motion

Unit 3

What do you already know about acceleration?

Learning Objective

At the end of the lesson, you will be able to explain acceleration - uniform motion and deceleration.

You are able to calculate the speed at any moment of different motions.

you can recognise and read off the (x,t) and (v,t) diagrams for different motions.

You are able to use an (x,t) diagram to work out when two road users will meet.

You can describe what a rejected take-off is (extra).

This slide should be displayed at the beginning of the lesson to inform students of the objective.

Which motion do the angry birds make?
acceleration - uniform motion- deceleration

What unit is used for speed?

1. meters per second
2. m/s
3. km/h
4. kilometers

Uniform motion

Uniform motion can be calculated using the formula v = s / t, where v is the velocity, s is the distance, and t is the time taken.

Explain the formula for calculating acceleration and give an example.

Uniform Motion

Uniform motion is when an object moves at a constant speed in a straight line. In uniform motion, acceleration is zero.

Uniform motion can be calculated using the formula 

v = v _avg = s / t, 

v  = the velocity, in m/s or km/h

s = the distance, in m or km

and t = the time taken, in s (seconds) or h (hours)

Explain uniform motion and give an example. Ask students to identify situations in which an object is in uniform motion.

2.     Explain why the start of this racing car is not

         a uniform motion.

Acceleration

Acceleration is the kind of motion in which te speed keeps increasing.

Or the rate of change of velocity over time. 

It is measured in m/s.

Explain the concept of acceleration in simple terms and give an example.

Positive Acceleration

When an object speeds up, its acceleration is positive. For example, a car moving from rest to a higher speed has positive acceleration.

Explain positive acceleration and give an example. Ask students to identify situations in which an object has positive acceleration.

Negative Acceleration

When an object slows down, its acceleration is negative. This is also called deceleration. For example, a car moving from a higher speed to rest has negative acceleration.

Explain negative acceleration and give an example. Ask students to identify situations in which an object has negative acceleration.

Graphing Acceleration

Acceleration can be graphed over time. A straight line on a velocity-time graph represents uniform acceleration.

Explain how to graph acceleration over time and give an example. Ask students to identify situations in which acceleration is uniform.

State at what times in the graph there is an acceleration, deceleration and a uniform motion.

Recap

Acceleration is the rate of change of velocity. Uniform motion has zero acceleration. Positive acceleration is when an object speeds up, and negative acceleration (deceleration) is when an object slows down.

Summarize the key points of the lesson and give students the opportunity to ask questions or clarify concepts.

Write down 3 things you learned in this lesson.

Have students enter three things they learned in this lesson. With this they can indicate their own learning efficiency of this lesson.

Write down 2 things you want to know more about.

Here, students enter two things they would like to know more about. This not only increases involvement, but also gives them more ownership.

Ask 1 question about something you haven't quite understood yet.

The students indicate here (in question form) with which part of the material they still have difficulty. For the teacher, this not only provides insight into the extent to which the students understand/master the material, but also a good starting point for the next lesson.