What could be another term What could be another term for for dragdrag??

a)a) Sliding Sliding frictionfriction

b)b) Fluid Fluid frictionfriction

c)c) Balanced Balanced forceforce

d)d) Unbalanced Unbalanced forceforce

Which type of force is not Which type of force is not acting on the falling leaves?acting on the falling leaves?a)a) Air Air

resistanceresistance

b)b) GravityGravity

c)c) Fluid Fluid frictionfriction

d)d) Rolling Rolling frictionfriction

The 3 The 3 Laws of Laws of MotionMotion

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

11stst Law of Motion Law of Motion ( (“Law of “Law of Inertia”Inertia”))

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

Sir Isaac NewtonSir Isaac Newton English mathematicianEnglish mathematician

Discovered 3 basic laws Discovered 3 basic laws

of motionof motion

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

11stst Law of Motion Law of Motion (“Law of (“Law of Inertia”)Inertia”)

InertiaInertia = an object tends to = an object tends to resistresist change in its change in its motionmotion

Eureka Inertia

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

11stst Law of Motion Law of Motion ( (“Law of “Law of Inertia”Inertia”))

InertiaInertia = an object tends to resist = an object tends to resist change in its motion change in its motion

Amount of inertia Amount of inertia

depends on object’s depends on object’s

massmass

Which ball has the most Which ball has the most inertia?inertia?

a)a) Golf ballGolf ball

b)b) Tennis ballTennis ball

c)c) Soccer ballSoccer ball

d)d) Bowling ballBowling ball

11 22 33 44 55 66 77 88 99 1010 1111 1212 1313 1414 1515 1616 1717 1818 1919 2020

2121 2222 2323 2424 2525 2626 2727 2828 2929 3030

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

11stst Law of Motion Law of Motion (“Law of Inertia”) (“Law of Inertia”)

Law says:Law says:

““An object at An object at restrest will will stay at reststay at rest

and an object and an object movingmoving with a with a constant constant velocityvelocity will will continue movingcontinue moving with with that constant velocity that constant velocity

unlessunless acted on by an acted on by an unbalanced unbalanced forceforce.”.”

No unbalanced forces

Ball at rest

Foot = unbalanced force

Ball accelerates

What would a flying airplane What would a flying airplane be doing if the forces of be doing if the forces of

thrustthrust and and dragdrag are are balanced?balanced?

a)a) Sitting Sitting still still

b)b) Moving Moving at a constant at a constant speed speed

c)c) Accelerating Accelerating

d)d) The forces of thrust The forces of thrust and drag cannot be and drag cannot be balancedbalanced

Where on the graph is the Where on the graph is the turtle experiencing turtle experiencing unbalanced forces?unbalanced forces?

a)a) Between Between A & B A & B

b)b) Between Between C & D C & D

c)c) Between Between B & C B & C

d)d) Between A & B Between A & B and between C and between C & D& D

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

22ndnd Law of Motion Law of Motion ( (“F = ma”“F = ma”))

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

22ndnd Law of Motion Law of Motion (“F = ma”) (“F = ma”)

The more The more massmass an object has, the more an object has, the more forceforce is needed to is needed to move itmove it

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

22ndnd Law of Motion Law of Motion (“F = ma”) (“F = ma”)

The more mass an object has, The more mass an object has, the more force is needed to the more force is needed to move itmove it

The more The more forceforce you put you put on an object, the on an object, the moremore it it will will accelerateaccelerate

What happens to the sled What happens to the sled when you add a second sled when you add a second sled

dog? dog?

a)a) The sled’s mass will be cut in The sled’s mass will be cut in half.half.

b)b) The sled’s mass will double.The sled’s mass will double.

c)c) The sled’s acceleration will be The sled’s acceleration will be cut in half. cut in half.

d)d) The sled’s acceleration will The sled’s acceleration will double.double.

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

22ndnd Law of Motion Law of Motion (“F = ma”) (“F = ma”)

Law says:Law says:““The amount of The amount of forceforce on an object is on an object is equal toequal to the object’s the object’s massmass timestimes its its acceleration.acceleration.””

force =force = mass x accelerationmass x acceleration

acceleration =acceleration = force / massforce / mass

How much force is needed to How much force is needed to accelerate a 3 kg skateboard at 5 accelerate a 3 kg skateboard at 5

m/sm/s22??What is the correct way to plug in the What is the correct way to plug in the

numbers?numbers?a)a) F = 3 kg + 5 F = 3 kg + 5 m/sm/s22

b)b) F = 3 kg x 5 F = 3 kg x 5 m/sm/s22

c)c) F = 3 kg ÷ 5 F = 3 kg ÷ 5 m/sm/s22

d)d) F = 5 m/sF = 5 m/s22 ÷ 3 ÷ 3 kgkg

How much force is needed to How much force is needed to accelerate a 3 kg skateboard at 5 accelerate a 3 kg skateboard at 5

m/sm/s22??a)a) 8 N8 N

b)b) 8 kg8 kg

c)c) 15 kg15 kg

d)d) 15 N15 N

How do you plug in the How do you plug in the numbers to find the sled’s numbers to find the sled’s

acceleration? acceleration?

a)a) A = 100N ÷ 50kgA = 100N ÷ 50kg

b)b) A = 100N x 50kgA = 100N x 50kg

c)c) A = 50kg ÷ 100NA = 50kg ÷ 100N

d)d) A = 50kg x 100NA = 50kg x 100N

What is the sled’s What is the sled’s acceleration? acceleration?

1.1. 2 m/s2 m/s22

2.2. 0.5 m/s0.5 m/s22

3.3. 50 m/s50 m/s22

4.4. 5000 m/s5000 m/s22

What would happen to the What would happen to the sled’s acceleration if the load sled’s acceleration if the load

doubled to 100kg?doubled to 100kg?

a)a) The acceleration would double.The acceleration would double.

b)b) The acceleration would stay The acceleration would stay the same.the same.

c)c) The acceleration would be cut The acceleration would be cut in half. in half.

d)d) The sled would not move.The sled would not move.

Team ScoresTeam Scores

00 Team 1Team 1

00 Team 2Team 2

00 Team 3Team 3

00 Team 4Team 4

00 Team 5Team 5

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

33rdrd Law of Motion Law of Motion ( (“action-“action-reaction”reaction”))

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

33rdrd Law of Motion Law of Motion (“action- (“action-reaction”)reaction”)

When you When you push onpush on

an object, that object an object, that object

also also pushes backpushes back on on

youyou

Newton’s 3 Laws of Newton’s 3 Laws of MotionMotion

33rdrd Law of Motion Law of Motion (“action- (“action-reaction”)reaction”)

Law says:Law says:

““If one object If one object exertsexerts a a forceforce

on another object, the on another object, the second second

objectobject exertsexerts an an equal equal

forceforce back on the first object.” back on the first object.”

How does pushing How does pushing backwards on water allow backwards on water allow

you to swim?you to swim?a)a) You push the water out You push the water out

of your way.of your way.

b)b) Water doesn’t have any Water doesn’t have any force.force.

c)c) When you push the When you push the water backward, it water backward, it pushes you forward with pushes you forward with more force.more force.

d)d) When you push the When you push the water backward, it water backward, it pushes you forward with pushes you forward with the same force.the same force.

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