Forces and Interactions
If a car hits a wall there must be two what?
Forces
What is Newton's Third Law?
For every action force there is an equal and oposite reaction force.
What are the action and reaction forces for a person heading a soccer ball?
Head on Ball
Ball on Head
What is Newton's Second Law?
F = ma
When two objects come into contact there must be this.
An interaction
How can we tell action forces from reaction forces?
We can't
What are the action and reaction forces for a car hitting a wall?
Car on Wall
Wall on Car
When a cannonball is fired from a cannon, the force the cannon exerts on the cannonball is exactly _______ and __________ to the force the cannonball exerts on the cannon.
Equal; Opposite
A car with mass 3,000 kg is accelerating at 1.4 m/s^2. What is the force of the car?
F = 4,200 N
A soccer player heads a ball. If we call the action force the impact of the head on the ball, what is the reaction force?
The ball on the person's head.
What are the action and reaction forces for a person lifting a barbell?
Barbell pushing down on person
Person pushing up on barbell
If the world pulls you downward against your chair, what is the reaction force?
You pull up on the chair
What is the definition of interaction?
A mutual action between objects where each object exerts an equal and opposite force on the other.
Someone is holding a book on their hand. If we call the action force the book pushing on the person's hand, what is the reaction force?
The person's hand pushing on the book
What are the action and reaction forces for a person picking a flower?
Flower pulls on Hand
Hand pulls on Flower
Identify the force that pushes a rocket.
Force of rocket on gas
A person is attracted to the center of the Earth with 568-N of force. What is the force with which Earth is attracted to the person?
568-N
According to Newton's third law, if you push hard against something what will happen to the object you are pushing on?
It will push hard on you.
What are the action and reaction forces acting on a balloon?
Air pushes out on Balloon
Balloon pushes in on Air
A dump truck and a small SUV are traveling at the same speed and have a head-on collision. Which vehicle will undergo a greater change in velocity?
The small SUV