Please explain the following: 1.When you apply a constant force to an object does the object move at a constant velocity or does its velocity increase? Explain why this occurs using your understanding of acceleration/force (gravity). 2. When you increase the applied force, what happens to the acceleration of the object? Explain. 3. As the mass increases, what happens to the amount of force needed to begin moving the object? Explain. 4. Do you need to continue applying force on an object to keep it moving? Explain why.

Please explain the following: 1.When you apply a constant force to an object does the object move at a constant velocity or does its velocity increase? Explain why this occurs using your understanding of acceleration/force (gravity). 2. When you increase the applied force, what happens to the acceleration of the object? Explain. 3. As the mass increases, what happens to the amount of force needed to begin moving the object? Explain. 4. Do you need to continue applying force on an object to keep it moving? Explain why.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter5: Newton's Laws Of Motion

Section: Chapter Questions

Problem 31PQ: A hockey stick pushes a 0.160-kg puck with constant force across the frictionless surface of an ice...

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A hockey stick pushes a 0.160-kg puck with constant force across the frictionless surface of an ice rink. During this motion, the pucks velocity changes from 4.00 m/s to (6.00 + 12.00) m/s in 4.00 s. a. What are the scalar components of the force acting on the puck? b. What is the magnitude of the force acting on the puck?
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?
You push a lawnmower (mass=15kg) across the lawn at constant speed. To do so, you must excert 200 N of force. The handle makes a 35° angle with the horizontal. A. Draw the force diagram B. What is the x-component of the force you apply? C. How does it compare to the frictional force which opposes your effort? Explain. D. If the frictional force is reduced to 100 N, determine the acceleration of the lawnmower.
Two particles are 1 m apart. Particle one has a mass of M= 1000kg, particle two has a mass of m= 100 kg. A. Find the magnitude of the gravitational force between them. B. Find the magnitude of acceleration for particle 1. C. Find the magnitude of acceleration for particle 2. D. According to your calculations, which particle has the greater magnitude of Acceleration? Why do you think that is ?
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?
2. You pull with a force of 255 N on a rope that is attached to a block of mass 30 kg, and the block slides across the floor at a constant speed of 1.1 m/s. The rope makes an angle of 0 = 40° with the horizontal. Both the force and the velocity of the block are in the xy plane. The block moves only along the direction parallel to the floor. See the figure for a diagram of this situation. a. What is the net force on the block? Explain your b. c. reasoning. Is there friction between the block and the floor? How do you know? Rope 40° 15₂ Draw a Free Body Diagram for the block. Find the magnitude and direction of each force, and express them as vectors.
Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can only withstand about 1.3 kN. a. If a 140 g baseball strikes your head at 30 m/s and stops in 0.0015 s, what is the magnitude of the ball’s acceleration? b. What is the magnitude of the force that stops the baseball? c. What force does the baseball apply to your head? Explain. d. Are you in danger of a fracture if the ball hits you in the forehead? In the cheek?
An astronaut weighing 236 lbs on Earth is on a mission to the Moon and Mars. a.What would he weigh in newtons when he is on the Moon? The acceleration due to gravity on the Moon is one-sixth that on Earth? b. How much would he weigh in newtons when he is on Mars, where the acceleration due to gravity is 0.38 times that on Earth? c. What is his mass in kilograms on Earth?
ans. a) 3.41 N a) What is the tension in the string? m/sec. The length of the string is 1.2 m. The mass of the ball is 400 g. b) Draw the force diagram for the forces on the ball. View from above 6. A person swings a ball on a string in a horizontal circle over his head. The speed of the ball is 3.2
5. A baseball is thrown upward from a height of 3 meters above Earth's surface with an initial velocity of 10m/s, and the only force acting on it is gravity. The ball has a mass of 0.15kg at Earth's surface. A. Find the velocity v(t) of the baseball at time t. B. What is its velocity after 2 seconds? C. The graph of the baseball
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.
Application I. Direction: Solve the following problem. Put your answer on a separate sheet. 1. A piece of equipment weigh 539 N and 209 N on Earth and Mars, respectively. What is the acceleration due to gravity on the surface of the Mars? 2. Two forces of magnitudes 6.0 N and 4.0 N act on a 3.2 kg body. What is the acceleration produced when these forces are acting in the same direction? What is the acceleration produced when these forces are oppositely directed?