1. Newton’s Toy Box Activity 3
Moving Masses
Newton’s Toy Box
Activity 3

2. Vocabulary
Acceleration
Mass
Newton’s second law of motion

3. What is Weight? What is Mass?
Weight is a measure of the amount of gravity pulling on an object.
Mass is a measure of the amount of matter in an object.
An object’s weight is affected by mass of the object and by gravity.

4. Weight/Mass
There is a direct relationship between mass and weight….but they ARE NOT the same.
An object’s weight is affected by mass of the object and by gravity.

5. Give me an example of when an object loses weight but not mass.
When the object is in a weightless environment…..in space.
For instance, a person can lose five-sixth of his/her weight by going to the moon….his/her weight has changed but the person’s mass has not changed.
The mass stays the same!!!!!

6. Activity
Spring Scale, Net Bag, Steel Ball, Wooden Ball, and Hardcover Book.
As a group, we will read over Activity Sheet #3.
Begin Step #1
Stop after Step #1

7. What is the relationship between mass and weight?
An object with more mass weighs more.

8. What is acceleration?
Acceleration means the rate of change in speed and direction.
When an object is falling, its speed increases.
Acceleration is a measure of the rate of increase or decrease in speed.

9. Activity Complete Step #2. Stop after Step #2
We will review your results before you proceed in the activity

10. What is the relationship between force and acceleration in this step? …..between acceleration and mass?
The stronger the force, the greater the acceleration (the harder the push, the faster the ball rolls)
This is a direct relationship!!!!
The ball with lesser mass, acceleration is greater and it rolls faster than the ball with more mass. This is Newton’s 2nd Law of motion.

11. Newton’s Second Law of Motion
F = Mass (m) x Acceleration (a)
Activity: The book strikes the two balls with the same force. We saw that the wooden ball accelerates faster than the steel ball.
a = F/m

12. Newton’s Second Law of Motion
An object acted on by a force will accelerate in the direction of the force.

13. Step 3 and 4 Complete step #3 and #4
Make your prediction prior to performing step #3
We will discuss these steps prior to class ending.