2) You are standing in a moving bus, facing forward, and you suddenly move forward asthe bus comes to an immediate stop. What force caused you to move forward?a. force of gravityb. force due to static friction between you and the floor of the busc. force due to kinetic friction between you and the floor of the busd. normal force due to your contact with the floor of the buse.no forces were responsible for your moving forward.2.

Answered: Image /qna-images/answer/3c493723-5583-4843-8945-60b2005ab4b6.jpg

Answered: 2) You are standing in a moving bus,…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter4: Dynamics: Force And Newton's Laws Of Motion

Section: Chapter Questions

Problem 29PE: A 1100-kg car pulls a boat on a trailer. (a) What total force resists the motion of the car, boat,...

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A soft tennis ball is dropped onto a hard floor from a height of 1.50 m and rebounds to a height of 1.10 m. (a) Calculate its velocity just before it strikes the floor. (b) Calculate its velocity just after it leaves the floor on its way back up. (c) Calculate its acceleration during contact with the floor if that contact lasts (3.50103s). (d) How much did the ball compress during its collision with the floor, assuming the floor is absolutely rigid?
A soft tennis ball is dropped onto a hard floor from a height of 1.50 m and rebounds to a height of 1.10 m. (a) Calculate its velocity just before it strikes the floor. (b) Calculate its velocity just after It leaves the floor on its way back up. (c) Calculate its acceleration during contact with the floor if that contact lasts 3.50 ms (3.50103s) (d) How much did the ball compress during its collision with the floor, assuming the floor is absolutely rigid?
A net force ___. (3.1) (a) can produce motion (b) is a scalar quantity (c) is capable of producing a change in velocity (d) both (a) and (c)
A 2.50-kg fireworks shell is fired straight up from a mortar and reaches a height of 110.0 m. (a) Neglecting air resistance (a poor assumption, but we will make it for this example), calculate the shell’s velocity when it leaves the mortar. (b) The mortar itself is a tube 0.450 m long. Calculate the average acceleration of the shell in the tube as It goes from zero to the velocity found in (a). (c) What is the average force on the shell in the mortar? Express your answer in newtons and as a ratio to the weight of the shell.
What properties do forces have that allow us to classify them as vectors?
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. The coefficient of static friction between the crate and the trucks flatbed is 0.350, and the coefficient of kinetic friction is 0.320. (a) The truck accelerates forward on level ground. What is the maximum acceleration the truck can have so that the crate does not slide relative to the trucks flatbed? (b) The truck barely exceeds this acceleration and then moves with constant acceleration, with the crate sliding along its bed. What is the acceleration of the crate relative to the ground?
A 1100-kg car pulls a boat on a trailer. (a) What total force resists the motion of the car, boat, and trailer, if the car exerts a 1900-N force on the road and produces an acceleration of 0.550 m/s2? The mass of the boat plus trailer is 700 kg. (b) What is the force in the hitch between the car and the trailer if 80% of the resisting forces are experienced by the boat and trailer?
A steel ball is dropped onto a hard floor from a height of 1.50 m and rebounds to a height of 1.45 m. (a) Calculate its velocity just before it strikes the floor. (b) Calculate its velocity just after it leaves the floor on its way back up. (c) Calculate its acceleration during contact with the floor if that contact lasts (8.00105s). (d) How much did the ball compress during its collision with the floor, assuming the floor is absolutely rigid?
different. e. There is not enough information to draw any conclusions regarding distance and displacement. 7. If a car is travelling, north with a constant speed of 25.0 m/s, what is the net force that acts on the car? a. EF = 9.80 N b. ΣF-0 C. EF =-9.80 N d. EF = 25.O N e. We cannot draw any conclusions about the force because we do not know the mass of the car. 8. If a fly collides with a windshield of a fast-moving car, which experiences impact force with a larger magnitude? a. The fly. b. The car. C. Both experience the same force. d. Depends whether the car isla Ford or a Holden. e. None of the above. Page 13 of 16 Assessment 3 of Semester 2, 2021 PHYS0004 Fundamentals of Physics 9. Select the most true statement from the following: a. Joule (J) is a unit of work. b. Joule (J) is a unit of energy. c. Joule (J) is a unit of power.
1.If we know an object is moving at constant velocity, we may assume: a. the net force acting on the object is zero.b. there are no forces acting on the object.c. the object is accelerating.d. the object is losing mass.2.Two forces act on a 6.00-kg object. One of the forces is 10.0 N. If the object accelerates at 2.00 m/s2, what is the greatest possible magnitude of the other force?a. 1.0Nb. 2.0Nc. 22.0 N d. 34.0 N3.If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is:a. at rest.b. moving with a constant velocity.c. being accelerated. d. losing mass.4.A karate master strikes a board with an initial velocity of 10.0 m/s, decreasing to 1.0 m/s as his hand passes through the board. If the time of contact with the board is 0.002 0 s, and the mass of the coordinated hand and arm is 1.0 kg, what is the force exerted on the board?a. 1000Nb. 1800N c. 2700N d. 4500N5.Rupel pushes a box 5.00 m by…
a. If an object is accelerating to the right, the net force on the object must be directed towards the right. b. If an object is moving to the right and slowing down, then the net force on the object is directed towards the left. c. Accelerating objects are either slowing down or speeding up. d. The acceleration of an object is directly dependent upon its mass and inversely dependent upon its net force. e. An object has an acceleration of 8 m/s/s. If the net force acting upon the object is increased by a factor of 2, then the new acceleration would be 10 m/s/s. f. An object has an acceleration of 8 m/s/s. If the net force acting upon the object is increased by a factor of 3, then the new acceleration would be 11 m/s/s.
A truck collides with a motorcycle causing a large amount of damage to the motorcycle. Which of the following is true about the collision? A. The force on the truck is the same in magnitude as the force on the motorcycle. The acceleration on the truck is the same in magnitude as the acceleration on the motorcycle. C. The displacement of the truck is the same in magnitude as the displacement of the motorcycle. ·The force on the truck is greater than the force on the motorcycle. E. The force on the motorcycle is greater than the force on the truck.

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