Science 3rd grade | UNIT 6: Forces and movement 6.3 How big is that force?
There are small forces and big forces.
 |
 |
|
Omar pulls his toys with elastic. He is pulling with more force on some toys. How can you tell that this is the case? What toy do you think needs the biggest force?
|
|
|
|
|
Activity 6.3 (Investigating how much force)
You will need: a balloon - objects to push against
Push against different objects with a balloon until they move. The bigger the force you need to move the object, the more squashed the balloon will be.
Choose five objects to push against. Record your results. Say whether you used a very small force, a medium force or a large force.
All sorts of large things can be moved with a large force.
Questions
1) Put these in order from the biggest force to the smallest force:
• a horse pulling a cart
• a girl lifting a book
• a train pulling wagons
• a bird picking up a leaf.
2) Saida stretches an elastic band. Is this a pulling force or a pushing force?
