Key Vocabulary
A push or a pull that can change an object’s motion.A push or a pull that can change an object’s motion.
What is force?What is force?
This force opposes motion when two surfaces rub against each other.This force opposes motion when two surfaces rub against each other.
What is friction?What is friction?
You push on a wall. This is the wall’s reaction force.The standard unit used to measure force.You push on a wall. This is the wall’s reaction force.
What is the wall pushes back on you?What is a newton (N)?What is the wall pushes back on you?
The standard unit used to measure force.
What is a newton (N)?
A book rests on a desk. The book pushes down on the desk, and the desk does this.A book rests on a desk. The book pushes down on the desk, and the desk does this.
What is pushes upward on the book?What is pushes upward on the book?
A change in an object’s position over time.A change in an object’s position over time.
What is motion?What is motion?
This force from the air pushes against a moving object.This force from the air pushes against a moving object.
What is air resistance?What is air resistance?
When you jump, your feet push down on the ground. This is the reaction force.When you jump, your feet push down on the ground. This is the reaction force.
What is the ground pushes up on you?What is the ground pushes up on you?
The letter used as the symbol for newtons.The letter used as the symbol for newtons.
What is N?What is N?
A swimmer pushes water backward. The water’s reaction force moves the swimmer this way.A swimmer pushes water backward. The water’s reaction force moves the swimmer this way.
What is forward?What is forward?
To strike or hit another object with force.To strike or hit another object with force.
What is collide?What is collide?
When you sit in a chair, your body pushes down on the chair and the chair pushes this way on your body.When you sit in a chair, your body pushes down on the chair and the chair pushes this way on your body.
What is upward?What is upward?
While walking, your foot pushes the ground backward. This reaction force moves you forward.While walking, your foot pushes the ground backward. This reaction force moves you forward.
What is the ground pushing your foot forward?What is the ground pushing your foot forward?
A student pushes a cart to the right with 10 N. The cart pushes back with this force.A student pushes a cart to the right with 10 N. The cart pushes back with this force.
What is 10 N to the left?What is 10 N to the left?
When a basketball hits the floor, the ball pushes down and the floor does this.When a basketball hits the floor, the ball pushes down and the floor does this.
What is pushes the ball upward?What is pushes the ball upward?
The equal and opposite force that occurs in response to an action force.True or false: Action and reaction forces always have the same strength.The equal and opposite force that occurs in response to an action force.
What is a reaction force?What is true?What is a reaction force?
True or false: Action and reaction forces always have the same strength.
What is true?
A rocket pushes exhaust gases downward. This reaction force launches the rocket.A rocket pushes exhaust gases downward. This reaction force launches the rocket.
What is the exhaust gases push the rocket upward?What is the exhaust gases push the rocket upward?
Object A pushes Object B with 25 N. Object B pushes Object A with this amount of force.Object A pushes Object B with 25 N. Object B pushes Object A with this amount of force.
What is 25 N?What is 25 N?
Give one example of Newton’s Third Law that could happen during a typical school day.Give one example of Newton’s Third Law that could happen during a typical school day.
What is an example such as walking, sitting in a chair, jumping, opening a door, or bouncing a ball?What is an example such as walking, sitting in a chair, jumping, opening a door, or bouncing a ball?
State Newton’s Third Law of Motion.State Newton’s Third Law of Motion.
What is: For every action force, there is an equal and opposite reaction force?What is: For every action force, there is an equal and opposite reaction force?
Equal and opposite action–reaction forces do not cancel each other because they act on these.Equal and opposite action–reaction forces do not cancel each other because they act on these.
What are different objects?What are different objects?
A car strikes a barrier with a force of 2,000 N. Describe the barrier’s reaction force on the car.A car strikes a barrier with a force of 2,000 N. Describe the barrier’s reaction force on the car.
What is a 2,000 N force in the opposite direction?What is a 2,000 N force in the opposite direction?
Two students on skateboards push apart with equal force, but one accelerates more. This property can explain the difference.During a car crash, a passenger pushes forward on a seat belt. Explain the seat belt’s reaction force and how it helps protect the passenger.Two students on skateboards push apart with equal force, but one accelerates more. This property can explain the difference.
What is mass?What is the seat belt pushes backward with an equal force, helping stop the passenger from moving forward?What is mass?
During a car crash, a passenger pushes forward on a seat belt. Explain the seat belt’s reaction force and how it helps protect the passenger.
What is the seat belt pushes backward with an equal force, helping stop the passenger from moving forward?