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DEVIL PHYSICS THE BADDEST CLASS ON CAMPUS PRE-IB PHYSICS

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Page 1: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

DEVIL PHYSICSTHE BADDEST CLASS ON

CAMPUSPRE-IB PHYSICS

Page 2: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

GIANCOLI LESSON 8-4TORQUE

Page 3: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Objectives

Know the definition of torque Know that torque is directly

proportional to the magnitude of the force and the perpendicular distance from the axis of rotation to the line along which the force acts

Know what a lever arm or moment arm is in relation to torque

Page 4: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Objectives

Solve problems involving torque Solve torque problems involving

forces applied at an angle other than perpendicular to the moment arm

Page 5: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Introductory Video

Page 6: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Center of Mass

CM

Page 7: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Center of Mass

CM

Page 8: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Center of Gravity

CMm1g m2g

msystem

g

Page 9: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Center of Gravity

Pivot point or fulcrum

m1g m2g

Page 10: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Center of Gravity

Pivot point or fulcrum

m1g

What’s gonna happen?

Page 11: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque

Pivot point or fulcrum

m1g

Torque happens!

Page 12: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Center of Gravity

Pivot point or fulcrum

m1g

Torque happens!

Page 13: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque – Case 1

Pivot point or fulcrum

m1g m2g

Page 14: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque – Case 2

Pivot point or fulcrum

m1g

Page 15: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque – Case 3

Pivot point or fulcrum

m1g m2g

Page 16: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque – Case 4

Pivot point or fulcrum

m1g m2g

Page 17: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque Torque is:

1. The moment of the force about the axis2. Another name for angular acceleration

Pivot point or fulcrum

m1g

Page 18: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque Is The product of the force times the

lever or moment arm. The lever arm is the distance between the force and the axis of rotation

or pivot point or fulcrum

Pivot point or fulcrum

m1g

rF

Page 19: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque Since torque is force times distance,

it stands to reason that the units will be Newton-meters (Nm)

Pivot point or fulcrum

m1g

rF

Page 20: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque If the blue box is 10kg and 30cm

from the pivot point, how much torque is produced and in what direction?

Pivot point or fulcrum

m1g

rF

Page 21: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque If the blue box is

10kg and 30cm from the pivot point, how much torque is produced and in what direction?

Pivot point or fulcrum

m1g

][4.29

81.91030.0

CCWNm

kgm

rF

Page 22: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque How much force

would have to be applied 10cm from the pivot to balance the box?

Pivot point or fulcrum

m1g

][294

][10.0

4.29

][4.29

CWNmF

FCCWNm

rFCCWNm

FP

Page 23: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque What if the force is applied at a 45°

angle?

Pivot point or fulcrum

m1g

FP

Page 24: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque What if the force is applied at a 45°

angle? You still need a vertical force of 294 Nm,

so the applied force must be a lot greater.

Pivot point or fulcrum

m1g

FP

294 Nm

Page 25: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Torque What if the force is

applied at a 45° angle?

Pivot point or fulcrum

m1g

FP

294 Nm 45°

NmF

NmF

F

Nm

P

P

P

41645cos

294

29445cos

Page 26: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

LET’S PLAY WITH STUFF

Page 27: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Summary Review

Do you know the definition of torque Do you know that torque is directly

proportional to the magnitude of the force and the perpendicular distance from the axis of rotation to the line along which the force acts

Do you know what a lever arm or moment arm is in relation to torque

Page 28: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

Summary Review

Can you solve problems involving torque

Can you solve torque problems involving forces applied at an angle other than perpendicular to the moment arm

Page 29: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

QUESTIONS?

Page 30: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

#29-33

Homework

Page 31: Objectives Know the definition of torque Know that torque is directly proportional to the magnitude of the force and the perpendicular distance

VIDEO: TORQUE VS. HORSEPOWER


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