Lecture 7 PowerPoint

# Thursday 27 september 12 8 accelerated reference

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Thursday, 27 September, 12

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8 Accelerated Reference Frames Reference frame that moves with the van: “mysterious” forces move the furniture when the van is accelerating, slowing down or cornering. Reference frame of the road (‘inertial frame’): Friction force between tires and road necessary for acceleration, cornering. Thursday, 27 September, 12
8 Accelerated Reference Frames Reference frame that moves with the van: “mysterious” forces move the furniture when the van is accelerating, slowing down or cornering. Reference frame of the road (‘inertial frame’): Friction force between tires and road necessary for acceleration, cornering. The motion of furniture is due to inertia: When the truck is cornering, the furniture wants to move straight (first law). Thursday, 27 September, 12

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8 Accelerated Reference Frames Reference frame that moves with the van: “mysterious” forces move the furniture when the van is accelerating, slowing down or cornering. Reference frame of the road (‘inertial frame’): Friction force between tires and road necessary for acceleration, cornering. The motion of furniture is due to inertia: When the truck is cornering, the furniture wants to move straight (first law). Need su ffi cient static friction or normal forces to keep furniture in place. Thursday, 27 September, 12
9 Question You are pushing your little brother in a box at constant speed across the room. Which is the correct free-body diagram showing all forces acting on your brother (not the box)? A B C D v 0 E None is correct Thursday, 27 September, 12

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10 Question You are pushing your little brother in a box at constant speed across the room. Which is the correct free-body diagram showing all forces acting on your brother (not the box)? A B C D v 0 E None is correct Thursday, 27 September, 12
11 Question You are pushing your little brother in a box across the room. Which is the correct free-body diagram showing all forces acting on your brother while speeding up?

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• Spring '11
• ERIC
• Force, Thursday

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