Now imagine we make the ball twice as big (double the mass) but keep the acceleration constant. F = ma says that this new ball has of the old ball. twice the force If you the mass, you the force. If you the acceleration, you the force. double double double double What if you double the mass the acceleration? and (2m)(2a) = 4F Doubling the mass the acceleration the force. and quadruples So . . . what if you How much force would the object have now? _______________ decrease the mass by half? F = ma basically means that the force of an object comes from its mass and its acceleration. Something very massive (high mass) that’s changing speed very slowly (low acceleration), like a glacier, can still have great force. Something very small (low mass) that’s changing speed very quickly (high acceleration), like a bullet, can still have a great force. Something very small changing speed very slowly will have a very weak force. NEWTON’S THIRD LAW OF MOTION = For every action there is an equal and opposite reaction. For every force acting on an object, there is an equal force acting in the opposite direction. Example #1: Right now, gravity is pulling you in your seat, but Newton’s Third Law says your seat is down pushing against you with This is why you are not moving. There is a acting on up equal force. balanced force you– gravity pulling down, your seat pushing up. Example #2: Flying gracefully through the air, birds depend on Newton’s third law of motion. As the birds push down on the air with their wings, the air pushes their wings up and gives them lift. Example #3: The baseball forces the bat to the left (an action); the bat forces the ball to the right (the reaction).
Now imagine we make the ball twice as big (double the mass) but keep the acceleration constant. F = ma says that this new ball has twice the force of the old ball. If you double the mass, you double the force. If you double the acceleration, you double the force. What if you double the mass and the acceleration? (2m)(2a) = 4F Doubling the mass and the acceleration quadruples the force. So . . . what if you decrease the mass by half? How much force would the object have now? _______________ F = ma basically means that the force of an object comes from its mass and its acceleration. Something very massive (high mass) that’s changing speed very slowly (low acceleration), like a glacier, can still have great force. Something very small (low mass) that’s changing speed very quickly (high acceleration), like a bullet, can still have a great force. Something very small changing speed very slowly will have a very weak force. NEWTON’S THIRD LAW OF MOTION = For every action there is an equal and opposite reaction. For every force acting on an object, there is an equal force acting in the opposite direction. Example #1: Right now, gravity is pulling you down in your seat, but Newton’s Third Law says your seat is pushing up against you with equal force. This is why you are not moving. There is a balanced force acting on you– gravity pulling down, your seat pushing up. Example #2: Flying gracefully through the air, birds depend on Newton’s third law of motion. As the birds push down on the air with their wings, the air pushes their wings up and gives them lift. Example #3: The baseball forces the bat to the left (an action); the bat forces the ball to the right (the reaction).
TCN%20-%20Forces%20and%20Newton%27s%20Laws%20of%20Motion.docx