This Topic is About...

• I will learn how different forces affect objects at rest and in motion.
• I will use force diagrams to show the name, size, and direction of forces acting on an object.
• I will practise making careful observations over time.

I’m ready to explore the world of forces!

Think Like a Scientist

Investigation: Investigate and discuss the effects of forces on an object.

You will need: A ping pong ball, a straw, a table, a book, a table cloth or towel.

 

Method:

1. Put the ball on the table. Does the ball move?
2. Blow on the ball through the straw. Observe what happens to the ball.
3. Hold up a book across one end of the table. Roll the ball gently towards the book. Allow the ball to roll into the book. Observe what happens when it reaches the book. Discuss the effects in your group to see if everyone agrees.
4. Cover the table with a table cloth. Roll the ball towards the book again. Observe and discuss how fast the ball rolls compared to when there was no cloth on the table.
5. Remove the table cloth. Flick the ball with your fingers towards someone else in your group. Get that person to flick the ball back. Observe and discuss what happens to the direction of the ball each time you flick it.

1. Place the ball on the table. The ball is at rest. Press down on it gently. Observe what happens to the shape of the ball.

Reflection:

How well did the members of your group work together? Did they take turns? Did they finish in time? Answer each question with ★★★★ or ★★★ or ★★.