The trucks begin to move at the same speed. Which truck needs a larger force to start moving?
a mail truck carrying 200 pounds of mail a mail truck carrying 450 pounds of mail
Two mail trucks are loaded with mail. The trucks are the same. But they are carrying different amounts of mail.
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 mail truck that is heavier.
A mail truck carrying 450 pounds of mail is heavier than a mail truck carrying 200 pounds of mail. So, the mail truck carrying 450 pounds needs a larger force to start moving at the same speed as the other mail truck.