Acceleration Lesson

Motion - Acceleration

What is Acceleration

Acceleration is the change in
velocity per unit time.

Acceleration can result from:

1. A change in speed (increase or decrease)
   
   

2. A change in direction (up, down, back, forth...)
   
   

3. Changes in both

Multiple Choice

This occurs when an object speeds up, slows down, or changes direction.

• Speed

• Velocity

• Acceleration

Multiple Select

Choose all ways an object can accelerate.

• speed up

• slow down

• change direction

• stay at a constant speed and never change direction

Multiple Choice

Acceleration and velocity are the same thing.

• True, they both measure speed

• False, acceleration is the rate at which velocity changes. Velocity is the speed AND direction of an object.

​Formula for finding Acceleration
(on your unit 1 student guide)

Multiple Choice

$$a=\frac{change\ in\ velocity}{time}$$  

An object at rest begins to move to a final speed of 30 m/s in 5 seconds. Calculate the object's acceleration.

• 6 m/s²

• -6 m/s²

• 150 m/s²

Multiple Choice

$$a=\frac{change\ in\ velocity}{time}$$  

An objects traveling at 10 m/s comes to a complete stop in 2 seconds. What is the objects acceleration?

• -5 m/s²

• 5 m/s²

• 200 m/s²

Multiple Choice

$$a=\frac{change\ in\ velocity}{time}$$  

Sami coasted on her bike straight down a hill, accelerating from a speed of 3 m/s to 15 m/s in a total time of 6 seconds. What was her acceleration?

• 1 m/s²

• -1 m/s²

• 2 m/s²

Graphing Acceleration

​Look at the graph on your Unit 1 Student Guide

What part of the graph shows no
acceleration?

What part of the graph shows the highest
acceleration?

Match

Match the following graphs to the right description.

Speeding up

No acceleration (constant speed)

Slowing down

• Speeding up

• No acceleration (constant speed)

• Slowing down

Multiple Choice

What is the acceleration in the first ten seconds?

• 4 m/s2

• 1.5 m/s²

• 10 m/s2

Multiple Choice

In which part of the graph is the object slowing down?

• A

• B

• D

Multiple Choice

What is the average acceleration at 30 seconds, according to the graph?

• 0.833 $$\frac{m}{s^2}$$

• 25 $$\frac{m}{s^2}$$

• 1.2 $$\frac{m}{s^2}$$

Multiple Choice

Karina is slowing down on her skateboard. She starts at a speed of 5.5m/s and slows to 1.0 m/s over a time of 3.0 seconds. What is Karina's acceleration?

• -1.5 $$\frac{m}{s^2}$$

• 8.5 m/s

• -2.5 m/s

Multiple Choice

A roller coaster's velocity at the top of a hill is 10m/s. 2 seconds later, it reaches the bottom of the hill with a velocity of 26 m/s. What was the acceleration of the coaster?

• 20 m/s

• 10 m/s2

• 8 $$\frac{m}{s^2}$$