This is the meaning of the word "net" in "net force."
What is total?
The motion of an object is determined by the sum of the _______ acting on it
What are forces?
If two forces are going in the same direction, this is what you should do to find the net force.
What is add?
If the total force on the object is not zero its motion will ______
Change
Jack and Jill move a pail of water. If Jack pushes with 10 N of force and Jill pulls with 15 N of force in the same direction, this is the net force on the pail.
What is 25 N?
An empty grocery cart and a full grocery cart are pushed with the same amount of force.
This is the cart (empty or full) that will accelerate more.
What is the empty cart?
The greater the ______ of the object, the greater the force needed to achieve the same change in motion
Mass
Jimmy pushes a box with 75 N of force. Friction works against him with a force of 10 N. This is the net force on the box.
What is 65 N?
A straight path an object can move along
What is direction
Juan and Jose are having an argument about their science book. Juan says that since the book is sitting still, there are no forces acting on it. Jose says there are forces acting on the book. Which student is correct? Explain why
Jose is correct because gravity is a force acting on all objects on Earth. However, the forces are balanced so the book is not moving (the net force on the book is zero).
This is a real life example of Newton's first law.
Many right thoughts here! Examples: Seat belt, moving forward in a car, athlete who has trouble stopping suddenly, a golf ball not moving just because you yelled at it, etc.
A push or pull that can change an object's motion
What is force
Mr. Brown and Mr. Slight both throw a football of the same mass. According to Newton's second law, this is why Mr. Slight's football will accelerate more.
What is Mr. Slight has big muscles that can apply more force?
What can cause a change in an object’s motion?
The change in an object’s motion depends on the sum of the forces on the object and the mass of the object.
What is the change in an objects position?
What is motion