The students start rolling their backpacks at the same speed. Which backpack is pulled with a larger force?
a backpack carrying 9 pounds a backpack carrying 6 pounds
Two students get ready to leave school. The students have the same rolling backpacks. Each student has different books in her backpack.
A force is a push or a pull.
A force can make an object start moving or stop an object that is moving. A force can also make an object speed up, slow down, or change direction.
Forces can be different sizes.
Think about trying to move a heavy object and a light object. Imagine you want to move them at the same speed. You will need to use a larger force to move the heavy object.
Look for the backpack that is heavier.
A backpack carrying 9 pounds is heavier than a backpack carrying 6 pounds. So, the backpack carrying 9 pounds needs to be pulled with a larger force to start rolling at the same speed as the other backpack.