Conceptual Question: Your hands are wet, and the restroom towel dispenser is empty. What do you do to get drops of water off your hands? How does the motion of the drops exemplify one of Newton’s laws? Which one?
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Topic:
Newton’s Laws of Motion
Conceptual Question: Your hands are wet, and the restroom towel dispenser is empty. What do you do to get drops of water off your hands? How does the motion of the drops exemplify one of Newton’s laws? Which one?
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- v: Consider the following equation: GMm F (1) R2 a) Define the parameters in Equation 1. b) What does Equation 1 mean? c) Combine Equation 1 and Newton's second law of motion. What does the result tell you?A stuntman drives a car of mass 1125 kg east with a speed of 20 m/s. a. If the car accelerates at a rate of –2 m/s 2 , how long will it take the car to go 50 m? b. The stuntman drives the car off an 80 m cliff while going 15 m/s. How long will it take the car to land? c. How far horizontally from the cliff will the car land?* Incorrect Newton's Third Law states that: a) A particle remains at rest or continues to move with a uniform velocity if there is no unbalanced force acting on it. b) The acceleration of a particle is proportional to the vector sum of forces acting on it, and is in the direction of this vector sum. O c) The forces of action and reaction between interacting bodies are equal in magnitude, opposite in direction, and collinear. O d) The velocity of a particle is proportional to the vector sum of forces acting on it, and is in the direction of this vector sum.
- The graph shows the force-time graph for a cart on a track (albeit a somewhat unrealistic one since the force goes from one value to another in zero time). a. calculate the area under the force-time graph. What physical quantity does your result give? Don't forget to give units. b. Draw a different force-time graph on the same axes that gives the same result.During a high speed chase, a fast running mouse collided with an elephant . The mouse rolled back after the collision. Using Newton's third law to explain the following. A. Why does the mouse roll back? B. Does the elephant have acceleration after the collision? If there is in what direction?Consider two cars, a 1,700 kg BMW and a 1,500 kg Mercedes-Benz. The BMW is speeding along at 120 km/h and the Mercedes-Benz is going half the speed at 60 km/h. If the two cars brake to a stop with the same constant acceleration, a. Is the amount of time required to come to a stop influenced by their initial velocity? Explain your answer using diagrams, equations, or any explanatory rules/principle b. Is the distance travelled prior to stopping influenced by their initial velocity? Explain your answer using diagrams, equations, or any explanatory rules/principles
- True or False: 1.Twenty mph North is a vector quantity called velocity. 2.If two tug boats headed in opposite directions each exert a 10,000 pound force on a barge, they will NOT change the motion of the barge. 3. A vector sun is always equal to the sun of the magnitudes of the vectors.3. DETAILS MY NOTES ASK YOUR TEACHER In a research facility, a person lies on a horizontal platform which floats on a film of air. When the person's heart beats, it pushes a mass m of blood into the aorta with speed v, and the body and m in 0.160 s platform move in the opposite direction with speed V. Assume that the blood's speed is 40.5 cm/s. The mass of the person + platform is 54.0 kg. The platform moves 5.85 x 10 after one heartbeat. Calculate the mass (in g) of blood that leaves the heart. Assume that the mass of blood is negligible compared with the total mass of the person, and the person + platform is initially at rest. (Also assume that the changes in velocity are instantaneous.)Which of the following best explains the greater difficulty in stopping a 1000-kg car moving at 174 km/h compared to an identical 1000-kg car moving at 100 km/h? A.The faster car has less air drag. B.The slower car has less tire friction. C.The faster car has greater momentum. D.The slower car has greater inertial mass.
- Two lovers are parked 10 m from the edge of a cliff in a sports car with mass, including that of the occupants, is 1000 kg. A jealous suitor ties a rope to the car’s bumper and a 50 kg rock to the other end of the rope. He then lowers the rock over the cliff, and the car, in neutral, accelerates toward the cliff. Ignoring all friction forces, a. Calculate the car’s acceleration.b. How much time do the lovers have to leap from the car before it is pulled over the cliff if the car is 10 m away from the cliff?Newton's 2nd Law Problems (with Kinematics) 1. A hockey puck with mass 0.160kg is at rest at the origin on the horizontal, frictionless surface of the rink. At t = 0, a player applies a force of 0.250N to the puck parallel to the surface. He continues to apply the force until t = 2.00s. What are the position and speed of the puck at t = 2.00?3. You push a grocery cart along a level floor in the presence of friction effects between the cart and the floor. a. Draw force diagrams for you, the cart, and the floor/earth. Fully label all vectors. b. While you are making the cart speed up, how does the size of the force you apply on the cart b. compare to the size of the force the cart exerts on you? Explain. c. While you are making the cart speed up, how does the size of the frictional force on the cart by the floor compare to the frictional force on you by the floor?