Forces in One Dimension4.1 Force and Motion4.2 Using Newton’s Laws

Jacob and logan

Define the following:ForceFContact forcesField forcesFree-body diagram

John and austin

How do we study force?A force exerted on an object causes an

acceleration (a change in velocity).A system is whatever object we are

considering the force of. Around that system is the external world (which includes gravity and any applied forces).

We must construct a free-body diagram that includes the object, or system, and ALL applied forces, including gravity.

Peyton and katie

Practice p.89For our purposes we will ignore

air resistance.Draw a free-body diagram for

#1-5 and include all forces.

Meghan and angel

Newton’s Second LawFind Newton’s Second Law on

p.93Use Newton’s 2nd Law to solve

practice problems 6-8.◦You must draw a free-body diagram!

◦Chelsea and auggie

Newton’s First LawFind Newton’s First Law on p.94.Write Newton’s 1st Law in your notesWrite the definition of

◦ Inertia◦Equilibrium

Read the final paragraph on p.95 before the section review. What does this mean?

Dj and chad

4.2 Using Newton’s LawsHow is Newton’s 2nd Law written

differently on p.96?How does a scale work?Use your new formula to solve

Practice problems on p.97 #15-18

Morgan and amber

BellringerDraw a free-body diagram for the

following situations including all forces acting on the system. Determine net force for each situation.

1. A block is pushed with an unbalanced force of 20 N to the left.

2. A football is kicked through the uprights.

4.2 DefinitionsDefine the following starting on

p.98◦Apparent weight◦Weightlessness◦Drag force◦Terminal velocity

ElevatorComplete practice problems #19-

20 on page 100.There will be an elevator problem

on your test!

AssignmentComplete all problems on the 4.1

and 4.2 section reviews.

Bellringer:

1. Luke Skywalker, Jedi knight-in-training (or padawan) is able to use the Force to lift a rock weighing 5 kg. How much Force is required to lift it?

2. Master Yoda, being stronger in the Force than Luke, was able to lift an 8,000 N X-wing fighter. What is the mass of the X-wing?

3. How much stronger in the Force is Yoda than Luke? (in Newtons, not midichlorians)

Interaction ForcesWrite out Newton’s Third Law in

words. What equation will go with

Newton’s Third Law?◦Complete practice problems together

on p.104

TensionTension is the force exerted by a

string or a rope.◦Complete practice problem p.106

#32 together◦Complete practice problem #33 on

your own.

◦Define Normal Force

AssignmentComplete the section review on

p.107 (36-39)

5.2 FrictionDefine static friction and kinetic

friction.What is the symbol for the

coefficient of friction?What is the equation for either

type of friction?

Practice togetherP.128 (17-21)P. 130 (22-26)