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