Chapter 4 Flashcards
State net owns first law
A body continues in its state of rest or of motion so constant velocity. Unless a acted upon by a non zero net force
Give an example of Newton’s first law
A book sitting on a table will remain sitting at the table unless an applied net force moves it, throwing a ball at constant velocity will remain in constant velocity until starts to decelerate or if something pushes it and it accelerates
State Newton’s second law
The acceleration of a body is directly proportional to the net force impressed on it in the direction of the net force and inversely proportional to the mas of the body
Give an example of Newton’s second law
Throwing a ball up where the mass and Gravity will push it down the arrow on fbd for fa is going up but fg goes down
If the acceleration of an object is zero are no forces acting on it
No there is still gravity and the normal force but there just isn’t any net force that is making it move and accelerate
If an object is moving is it possible for the net force acting on it to be zero
Yes as long as there’s no friction or applied force pushing or stopping the object and the object is traveling at constant velocity yet it is still moving
Explain why your foot might hurt if you kick a heavy desk
The amount of force you exert on desk the desk will exert on the your foot in the qual magnitude of force
State Newton’s third law
When on object exerts force on a second object the second object exerts an equal in magnitude and opposite in direction force on the first object
When a ball is dropped on the floor it bounces back up what force is needed to make it bounce up and what object exerts this for d and what law is this
Newton’s law so the floor will make it bounce back up bc of the normal force that push the ball down then the normal force of the floor will push it back up making it bounce, the amount of force and mass exerted by the ball will be exerted back to it by the floor
If a small car crashes into a large truck which one will feel the greater force
It will be the same because of teh third law where the force exerted by teh little car to the truck will be exerted back by teh truck to the car
If a man hits a puck across the ice name and give action reaction by using the three laws
3 law: contact between luck adn stick stick exerts force on puck puck exerts back the same force making the stick come back
2 law: the puck goes to the right as the stick hit the puck to the right even though mass of puck is down to the ground
1 law: if ice is frictionless puck will move at constant velocity or before the puck is hit it is in rest until the net force exerted by the stick makes it move and accelerate
Explain what a fad is and why use it in physics
They determine the net force and show the relative magnitude and directions of all forces acting on an object
