Force Daigrams

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Questions: 1. Read each description below. Choose the force diagram (free-body diagram) that best represents the description. The forces are acting on the object in red type. You may neglect the effects of air resistance. |

A. Mindy's Christmas tree ornament hangs motionless on a tree.| B. Corey's Christmas tree ornament is falling to the floor.| C. A ball thrown by Ginger is moving upward through the air.| D. A ball dropped by Melissa is falling downward toward the floor.| E. Matt's book is motionless on a table.|

F. A ball that was thrown upward by Yvonne is at the top of its path.|

2. Read each description below. Choose the force diagram (free-body diagram) that best represents the description. You may neglect the effects of air resistance. |

A. Mark's physics book is on the desk. Mark pushes horizontally (from the side) on the book, but the book does not move.| B. Kendall's physics book is on the desk. Kendall pushes horizontally (from the side) on the book, and the book moves across the desk at a constant speed.| C. Jenny pushes a cart at constant velocity down the grocery store aisle.| D. Eddy is driving his Camaro down a straight, level road while on cruise control.| E. Ryan is accelerating his Dakota down a straight, level road.| F. Jackie's Viper is parked on the shoulder of the road while she changes a flat tire.|

3. Paul Hewitt poses this question in his book: "If the forces that act on a bullet and the recoiling gun from which it is fired are equal in magnitude, why do the bullet and gun have very different accelerations?" Think about Newton's Second Law (F = ma) to answer his question. [Source: © 1997 Paul Hewitt, modified by FLVS] The mass of the bullet is lower than the mass of the gun causing the bullet to have a greater acceleration than the gun according to newton’s third law of motion. 4. Jessica's weight is 540 Newtons. According to the Third Law, if the Earth pulls on Jessica with a force of...
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