Physics true false
false, acceleration=9.8 m/s^2
a ball is thrown into the air. at the highest point of its path, the ball has zero velocity and zero acceleration
false, vector
a quantity that has both magnitude and direction is called a scalar.
true
a rocketship is pushed forward by gases that are forced out the back of the ship
false, original vector was the resultant of the x and y vectors
a single vector can be replaced by two vectors in the x and y directions. these x and y vectors are called the resultant of the original vector.
false, acceleration directly proportional
acceleration is inversely proportional to the net force acting on an object
true
air resistance is caused by friction between the air and an object moving through the air
false, friction increases
as a ball falls freely, the distance it falls each second is the same
false, newton's 3rd law, equal and opposite forces
if a bicycle and a parked car have a head-on collision, the force of impact is greater on the bicycle
false, will never slow down
if a hockey puck slides on a perfectly frictionless surface, it will eventually slow down because of its inertia
false, horse pushes on ground, ground pushes back to move horse + cart
in order to make a cart move forward, a horse must pull harder on the cart than the cart pulls on the horse
true
inertia is the resistance any material object has to change in its state of motion
false, mass is scalar
mass is a vector quantity
false, mass
the amount of matter in an object is called the weight of the object
true
the combination of all the forces that act on an object is called the net force
false, weight
the force due to gravity acting on an object is called the mass of the object
True
the rate at which velocity changes with time is called acceleration
false, meters per second squared
the si unit of acceleration is meters per second
false, Newton
the si unit of force is called the kilogram
false, when upward force=weight-stop accelerating
the speed of an object dropped in air will continue to increase without limit until it strikes the ground
false, changing direction
when a car rounds a corner at a constant speed, its acceleration is zero
true
when a woman pushes a lawnmower along the handle, she pushes down as well as forward
true
when one object exerts a force on another object, the second object always exerts a force back on the first object
true
wind velocity can be represented as a vector quantity