College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:Sledding A sled with a mass of 80.0 kg is pulled
along flat, snow-covered ground. The static friction
coefficient is 0.30, and the kinetic friction
coefficient is 0.10.
a. What does the sled weigh?
b. What force will be needed to start the sled
moving?
c. What force is needed to keep the sled moving
at a constant velocity?
d. Once moving, what total force must be applied
to the sled to accelerate it at 3.0 m/s??
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- 1.arrow_forwardA 10-kg wooden box rests on a ramp that is lying flat. The coefficient of static friction is 0.50, and the coefficient of kinetic friction is 0.30. What is the friction force between the box and ramp if a 30 N horizontal force is applied to the box? A.50 N B.20 N C.0 N D.30 Narrow_forwardA person exerts a force of 120 NN on a rope that pulls a sled across a very smooth horizontal surface. The rope is oriented 37⁰0 above the horizontal. The sled has a total mass of 50 kgkg. The sled starts at rest and moves for 10 mm. Select all the quantities that can be determined using the given information. A. Determine the acceleration of the sled. B. Determine the normal force exerted by the surface on the sled. C. Determine the time taken for the sled to move 10 m. D. Determine the speed of the sled after moving for 10 m. F. Check all that apply. acceleration of the sled normal force exerted by the surface on the sled mass of the person time taken for the sled to move 10 mm speed of the sled after moving 10 mmarrow_forward
- Three boxes in contact slide side-by-side on a smooth, friction-less, horizontal floor. Their masses are 5.0-kg, 3.0-kg, and 2.0-kg, with the 3.0-kg box in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes. A. Draw the free-body diagrams for each of the boxes. B. What magnitude force does the 3.0-kg box exert on the 5.0-kg box? C. What magnitude force does the 3.0-kg box exert on the 2.0-kg box?arrow_forwardA restaurant manager pushes a box of melons horizontally with a force of magnitude 150 N. The box moves along the floor with a constant acceleration in the same direction as the applied force. Which statement is more precise regarding the magnitude of the kinetic friction force acting on the crate? a. It is greater than 150 N. b. It is equal to 150 N. c. The friction force must be zero. d. The kinetic friction force is constantly decreasing. e. It is less than 150N.arrow_forwardTwo blocks are connected via a pulley, both blocks have a mass of 10.kg. One block rests on a horizontal surface and the other one hangs freely by a cord which passes over a pulley. Assume the cord does not stretch, ignore mass of pulley and cord, therefore acceleration is the same for both blocks and tension is the same for both blocks. The hanging block moves down so the block lying on the horizontal surface moves to the right. b. A 10.0 kg box slides down a 30.0 degrees incline at a rate of 0.40 m/s^2. What is the coefficient of kinetic frictionarrow_forward
- An orthodontist places 35 pounds of tension on the wire across your teeth.The insicor is just forward so that the wire is bent at 15 degrees on either side. a. What net force does the wire apply to the tooth? b. The tooth shifts and the ledt angle becomes 10 degrees while the right angle becomes 20 degrees. Assuming that the tension stays the same, what force is now applied to the tooth?arrow_forwardWhat does the graph of the force of the ground on the runner’s foot look like? b. Explain why there are two peaks. c. How can the force on the runner’s foot be greater than their body weight? (Hint: draw a free body diagram and focus on the forces in the vertical direction)arrow_forward7. A woman pushes her sied across even snow surface to get it going, then jumps in. The sled then aradually slows to a halt after she jumped in. What forces act on the sled just after she's jumped in? a. Gravity and kinetic friction b. Gravity and a normal force C Gravity and the force of the push d. Gravity, a normal force, and kinetic friction e. Gravity, a normal force, kinetic friction, and the force of the pusharrow_forward
- Two people are pushing an object. The first person applies 600N of force to the West. The net force acting on the object is 450N. The object is accelerating at 2.3 m/s?. a. Draw the free body diagram. b. What force is the second person pushing on the object? c. What is the mass of the object?arrow_forwardResearchers often use force plates to measure the forces that people exert against the floor during movement. A force plate works like a bathroom scale, but it keeps a record of how the reading changes with time. Shown is the data from a force plate as a woman jumps straight up and then lands.a. What was the vertical component of her acceleration during push-off?b. What was the vertical component of her acceleration while in the air?c. What was the vertical component of her acceleration during the landing?d. What was her speed as her feet left the force plate?e. How high did she jump?arrow_forwardwhile tom pushes a 40 kg box in horizontal direction along the classroom floor with a 100 N force, the box is moving in a straight line with constant speed of 0.5 m/s. Ignor air resistance when answering the questions below. a. Write down as much information as you can about the main horizontal forces exerted on the box ( names, directions and if enough information is given, numerical values). b. Write down as much information as you can about the main vertical forces exerted on the box (names, directions, and whenever possible, if enough information is given, numberical values). c. How far did the refrigerator move during those 3 seconds? Explain d. What was the refrigerator's acceleration during that time? Explainarrow_forward
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