Newton's Laws - Sheet1
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force
a push or pull on an object
friction
force between two objects when they are touching and in motion
weight
pull of gravity on an object measured in newtons
acceleration
change in velocity over time
newton
the unit by which force is measured
inertia
resistance of an object to a change in it’s motion
free body diagram
a diagram representing forces on an object
newtons 1st law
an object in motion stays in motion and an object at rest stays at rest unless acted on by an unbalanced force
newtons 2nd law
an unbalanced force causes a mass to accelerate
newtons 3rd law
for every action, there is an equal and opposite reaction
air resistance
the resistance force acting on an object as it falls through the air
equilibrium
a state of physical balance
net force
all forces added together
balanced forces
forces that are equal in magnitude and opposite in direction
applied force
a push or a pull on an obect caused by another object
static friction
frictional force resisting the start of motion
kinetic friction
friction between objects in motion
equation for newtons 2nd law
f=ma
mass
amount of matter that makes up an object
A magician pulls a tablecloth out from under dishes and glasses on a table without disturbing them. Which of Newton’s Laws does this represent?
Ist Law, which is also called the law of inertia
Generally, pushing a child on a swing is easier than pushing an adult on the same swing. Which on Newton’s Laws does this represent?
Newton’s 2nd Law
If the net force on an object is zero, the object is either ____________or _____________.
moving with constant velocity or at rest