1) What is meant by relative motion? 2) What is a frame of reference? 3) When you are asked what the motion of an object is relative to a frame of reference, what velocity does an observer in that frame of reference imagine that s/he has? 4) Tim is walking down the aisle of a speeding bus and tosses a coin into the air. Matthew is standing on the sidewalk outside. a) Draw the trajectory of the coin from Tim's frame of reference b) Draw the trajectory of the coin from Matthew's frame of reference. 5) Tara is a pilot that is going to drop a package on an enemy storage depot. With a camera mounted under the plane, she watches the package drop Annie is an observer on the ground who also watches the package drop. Assume air resistance is small. a) Draw the trajectory of the package from Tara's frame of reference. b) Draw the trajectory of the package from Annie's frame of reference. 6) An old-fashioned physics dilemma used to be- if a sailor in the crow's nest (a place way up high in the rigging) of a sailing ship that was moving at constant speed dropped a tool onto the deck of the ship, would it land directly beneath where he dropped it or since the ship was moving, would it land further back? Explain your answer.

Question

1) What is meant by relative motion? 2) What is a frame of reference? 3) When you are asked what the motion of an object is relative to a frame of reference, what velocity does an observer in that frame of reference imagine that s/he has? 4) Tim is walking down the aisle of a speeding bus and tosses a coin into the air. Matthew is standing on the sidewalk outside. a) Draw the trajectory of the coin from Tim's frame of reference b) Draw the trajectory of the coin from Matthew's frame of reference. 5) Tara is a pilot that is going to drop a package on an enemy storage depot. With a camera mounted under the plane, she watches the package drop Annie is an observer on the ground who also watches the package drop. Assume air resistance is small. a) Draw the trajectory of the package from Tara's frame of reference. b) Draw the trajectory of the package from Annie's frame of reference. 6) An old-fashioned physics dilemma used to be- if a sailor in the crow's nest (a place way up high in the rigging) of a sailing ship that was moving at constant speed dropped a tool onto the deck of the ship, would it land directly beneath where he dropped it or since the ship was moving, would it land further back? Explain your answer.

Answer 1

1. Relative motion refers to the motion of an object as observed from a particular frame of reference, which may itself be in motion.2. A frame of reference is a coordinate system or viewpoint used to measure and observe physical phenomena.3. An observer in that frame of reference imagines they have zero velocity relative to the frame.4. a) The trajectory of the coin from Tim's frame of reference is a vertical line. b) The trajectory of the coin from Matthew's frame of reference is a parabola.5. a) The trajectory of the package from Tara's frame of reference is a vertical line. b) The trajectory of the package from Annie's frame of reference is a parabola.6. The tool would land directly beneath where it was dropped because it retains the horizontal velocity of the ship, moving with it as it falls.

Answer 2

1. Relative motion refers to the calculation of the motion of an object with respect to another moving object.2. A frame of reference is a set of coordinates or a viewpoint used to measure and observe physical phenomena.3. An observer in a frame of reference imagines they have zero velocity relative to that frame.4. a) From Tim's frame, the coin moves up and down vertically. b) From Matthew's frame, the coin follows a parabolic trajectory.5. a) From Tara's frame, the package falls straight down. b) From Annie's frame, the package follows a parabolic trajectory.6. The tool would land directly beneath where it was dropped because it retains the horizontal velocity of the ship.

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