Download Learning Goals/Success Criteria for Forces

Forces and Motion Unit 1.
2.
Learning Goals
We will re-visit
Newton’s First Law
Success Criteria
I know that an object will travel in straight line at a constant speed unless there is a net
force acting on the object
We will re-visit
Newton’s Second Law
I can apply the First Law to explain various situations
I know that objects that are heavier typically will accelerate less when there is a net
force acting on it, compared to lighter objects
I can apply the Second Law to explain various situations
I can explain what net force means, and know how to calculate it
I can explain the difference between balanced and unbalanced forces
3.
We will analyze the
forces in 2 dimensions
acting on objects that
are at rest and
accelerating
I can complete the practice problems related to this learning goal
I can draw the forces acting on an object
I can find the components of a force acting at an angle with respect to the horizontal
using cosine and sine ratios
I can determine the normal force acting on an object while it is accelerating, or if there is
more then the force of gravity acting on it (that is, if there is an applied force acting
partially in the horizontal direction and partially in the vertical direction)
I can solve for the acceleration of an object, if the forces are known
I can solve for the forces acting on an object, if the acceleration is known or can be
solved for
4.
We will analyze the
forces in 2 dimension
acting on an object
moving down an
incline (hill) or up an
incline
I can complete the practice problems related to this learning goal
I can draw the forces acting on an object while sliding down on an incline or going up an
incline
I can find the components of the force of gravity acting on an object
I can draw the normal force acting on an object (normal means ___________ to the
surface)
I can solve for the acceleration of an object on an incline, if the forces are known
I can solve for the forces acting on an object on an incline, if the acceleration is known
or can be solved for
5.
We will investigate the
force of friction and the
coefficient of friction,
both static and kinetic
I can complete the practice problems related to this learning goal
I can draw the force of friction acting on an object
I can solve for the force of friction if the coefficient of friction and the normal force is
known
I can solve for the coefficient of friction (both static and kinetic) by performing an
experiment
I can complete the practice problems related to this learning goal
6.
7.
We will analyze the
force of friction for
objects that are moving
on a plane and for
object that are moving
on an incline
We will re-visit
Newton’s Third Law
I understand that without friction, a car would not be able to accelerate (either speed up
or slow down)
I understand that reducing friction is important for some sporting activities
I can solve for the force of friction, if the acceleration and all other factors are known
I can complete the practice problems related to this learning goal
I can apply the Third Law to explain various situations
I understand that when objects are connected by a cable, the force of tension acting on
each object is identical
8.
9.
10.
We will analyze the
forces acting on a
pulley system in a
variety of situations
(when accelerating and
when at rest)
We will analyze
circular motion and the
formulas that are used
to calculate centripetal
acceleration
We will analyze the
forces that are acting
on objects while
experiencing a
centripetal
acceleration. These
situations include the
forces acting on a car
that is turning, forces
acting on a ball at the
end of a string while
turning and the forces
acting on a pilot while
flying a plane
I can complete the practice problems related to this learning goal
I can draw the forces acting in a pulley system
I can solve for the acceleration of a pulley system if I have knowledge of all the forces
acting on the pulley system, by using a system of equations
I can solve for the force of tension in a pulley system
I can complete the practice problems related to this learning goal
I can solve for the speed of an object traveling in a circle if given the object’s radius and
period
I can solve for the centripetal acceleration of an object based on being given the object
speed, period and/or radius
I can complete the practice problems related to this learning goal
I understand that for an object to travel in a circular parth (orbit), it requires a force
acting towards the center of the circular path
I can draw the forces acting on a car during a turn
I can solve the centripetal acceleration of a car if I have knowledge of the forces acting
on the car
I can solve for the maximum force of friction required to complete a turn by a car based
on the speed of the car and its turning radius
I can draw the forces acting on a ball attached to a string while spinning in a horizontal
or vertical plane
I can solve for the tension force acting on a ball attached to a string while spinning in a
horizontal or vertical plane
I can extend my understanding of centripetal forces to analyze problems beyond those
presented during class time (see practice problems)
11.
12.
We will analyze the
advantages of a
clothoid loop
We will analyze the
forces acting on a car
I can explain what a G-Force is and how a G-suit helps fighter pilots and possibly
prevents them from blacking out
I can explain why some roller coasters use loops that are shaped like a clothoid instead
of a circle, using ideas related to centripetal forces
I can draw the forces acting on a bank curve for a car and find the components of force
of friction and the normal force
that is turning on a
banked angle, and the
advantages offered by
a banked angle
I can solve problems related to bank curves (determine maximum centripetal
acceleration)
Using the ideas of forces, I can explain why bank curves are used for highway exit or
entrance ramps
13.
We will analyze the
force of gravity acting
between objects that
are separated by large
distances (ie a satellite
and a planet, or a
planet and its moon)
I can complete the practice problems related to this learning goal
I understand how to apply Newton’s Universal Law of Gravitation
I understand when I am near the surface of a planet, F = mg is the same as the Universal
Law of Gravitation
I understand the relationship between gravitational force of attraction and distance
I understand the relationship between gravitational force of attraction and mass
I can solve for the force of gravity acting between two objects if I know the object’s
mass and the separation distance
14.
We will analyze orbital
mechanics and the
force acting on objects
in orbit
I can complete the practice problems related to this learning goal
I understand that for an object to maintain a circular orbit, the object requires
__________________ and ___________________
I can draw the forces acting on an object while in orbit
I can solve for the orbital period of an object if I know the distance the object is from a
planet along with the planet’s mass
15.
16.
17.
We will investigate
centripetal forces using
video analysis of a toy
We will investigate
centripetal forces and
use the theory to
predict the mass of an
object that is spinning
We will investigate the
motion of falling
coffee filters and
examine the forces
acting on them at
terminal velocity
I can complete the practice problems related to this learning goal
I can apply my understanding of bank curves to help solve other problems (ie spinning
toys)
I can complete a lab experiment and by measuring the period and radius for a rubber
stopper that is spinning, along with indirectly measuring the centripetal force, I can
determine its mass
I can determine the terminal velocity for a falling object using its fall distance and a
stopwatch to record time
I can measure the drag force acting on a falling object when it is at terminal velocity, by
knowing the mass of the object
I can determine the coefficient of drag by creating a graph (see lab instructions),
drawing a line of best fit and calculating the slope for the line of best fit