WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.MORE.ON.WORK.ENERGY.7.2.PRACTICE.PROBLEMS PAGE 1 OF 8
2. A 0.300-kg ball has a speed of 15.0 m/s. its kinetic energy?
What is its kinetic enery?
If it speed were doubled, what would be
WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.MORE.ON.WORK.ENERGY.7.2.PRACTICE.PROBLEMS PAGE 2 OF 8
3. A mechanic pushes a 2500-kg car, moving it from rest and making it accelerate from rest to a speed v. He does 5000 J of work in the process. During this time, the car moves 25.0 m. If friction between the car and the road is what is the final speed v of the car? What horizontal force did he exert on the car? negligible,
WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.MORE.ON.WORK.ENERGY.7.2.PRACTICE.PROBLEMS PAGE 3 OF 8
4. A 40.0-kg box initially at rest is pushed 5.00 m along a rough, horizontal floor with a constant applied force of 130 the work done by the applied force, N. If the coefficient of friction between the box and the floor is 0.300, find the energy loss due to friction, the work done by the normal force, the work done by gravity, the the final speed of the box. change in kinetic energy of the box, and
WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.MORE.ON.WORK.ENERGY.7.2.PRACTICE.PROBLEMS PAGE 4 OF 8
5. A crate of mass 10.0-kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, which makes an angle of 20.0 with the horizontal. The coefficient of kinetic friction is 0.400, How much work is done by gravity? How much energy is loss due to friction? and the crate is pulled 5.00 m. How much work is done by the 100-N force? What is the change in kinetic energy of the crate? What is the speed of the crate after it has been pulled 5.00 m?
WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.MORE.ON.WORK.ENERGY.7.2.PRACTICE.PROBLEMS PAGE 5 OF 8
6. A block of mass 12.0-kg slides from rest down a frictionless 35.0 incline and is stopped by a strong spring with . The block slides 3.00 m from the point where it comes to rest against the spring. When the block comes to rest, how far has the spring been compressed?
WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.MORE.ON.WORK.ENERGY.7.2.PRACTICE.PROBLEMS PAGE 6 OF 8
7. A sled of mass m is given a kick on a frozen pond. The kick imparts to it an initial speed . The . Utilizing energy considerations, find the coefficient of kinetic friction between the sled and the ice is distance the sled moves before it stops.
WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.MORE.ON.WORK.ENERGY.7.2.PRACTICE.PROBLEMS PAGE 7 OF 8
8. A block of mass 1.6-kg is attached to a horizontal spring that has a force constant of . The spring is Calculate the speed of the block as it passes through the compressed 2.0 cm and is then released from rest. if the surface is frictionless. equilibrium position
WWW.MIAMI-BEST-MATH-TUTOR.COM PHYSICS.I.MORE.ON.WORK.ENERGY.7.2.PRACTICE.PROBLEMS PAGE 8 OF 8
You May Also Find These Documents Helpful
-
Inertia is what keeps an object in its rest state or moving at constant velocity. In other words, it is the tendency for objects to resist a change in their motion. The only thing inertia depends on is the mass of the object, so heavier objects have more inertia and it is harder to change its motion. When you accelerate quickly, you get pushed back against the seat. Because of inertia, your body keeps traveling at the same velocity as before the acceleration. Inertia can also be experienced when the car turns sharply and you get pushed to the opposite side because the body wants to continue in a straight line. This tendency (for objects to be kept in its rest state or keep moving at its…
- 908 Words
- 4 Pages
Good Essays -
8. A car of mass 1000 kg rounds an unbanked curve of radius 80 m. If the coefficient of static friction between the tires and the road is 0.6, what is the maximum speed the car can go without slipping?…
- 2368 Words
- 10 Pages
Good Essays -
2) In Fig. 6-33, two blocks are connected over a pulley. The mass of block A is 7.8 kg and the coefficient of kinetic friction between A and the incline is 0.13. Angle θ of the incline is 44°. Block A slides down the incline at constant speed. What is the mass of block B?…
- 313 Words
- 2 Pages
Good Essays -
6. A student pushes a 0.5 kg mass along a horizontal ramp according to the F-d graph shown below. a) How much work did the student do on the mass? b) What speed did the mass leave the…
- 388 Words
- 2 Pages
Satisfactory Essays -
If the pendulum is allowed to swing down from rest starting from an initial horizontal position, with the forces acting being T, the tension in the string, and m g , the force of gravity, how much work has been done on the pendulum as it swings through the vertical position? 4. More information is needed 1. m g +T times 025 10.0 points…
- 5122 Words
- 42 Pages
Satisfactory Essays -
3. If the car in problem #2 starts at rest from the height of 75 m, what will its speed be when it is 5 meters from the ground? What is the change in potential energy relative to the ground? What is the change in kinetic energy relative to the ground?…
- 510 Words
- 3 Pages
Good Essays -
1. A 1.08 x 103 kg car uniformly accelerates for 12.0s from rest. During this time the car travels 132 m north. What is the net force acting on the car during this acceleration 2. A net force of 12 N is exerted on and to cause it to accelerate at a rate of 0.03 m/s2. Determine the mass of the encyclopedia. HYPERLINK http//fc.codmanacademy.org/branches/physicsofdriving2/pushingbuses.jpg INCLUDEPICTURE http//fc.codmanacademy.org/branches/physicsofdriving2/images/pagemaster/pushingbuses.jpg MERGEFORMATINET 5. 4. How much force does a 40,000kg rocket develop toaccelerate 2m/s2 5. Block 1 is 12kg and block 2 is 23kg calculate the force that is needed to move the blocks a distance of 3 meters in 4 seconds. SHAPE MERGEFORMAT 6. Peter is trying to move a large rock across the table, if the rock is 12kg how much force does peter need to exert to move the rock with acceleration of 0.5 m/s2 . 7. Angel is moving a small rock easily by exerting a force of 2N to move the rock from rest to 0.7m/s in 3 seconds, what is the mass of the small rock. 3. Calculate the net force that Eddie has to exert on the van to move with an acceleration of 0.013m/s2…
- 2264 Words
- 10 Pages
Satisfactory Essays -
10. Two children push on a heavy crate that rests on a basement floor. One pushes horizontally with a force of 150 N and the other pushes in the same direction with a force of 180 N. The crate remains stationary. Show that the force of friction between the crate and the floor is 330 N.…
- 1913 Words
- 8 Pages
Powerful Essays -
a) When the 3 kg weight is moving with a speed of 2.2 m/s, what is the kinetic energy of the entire system?…
- 965 Words
- 4 Pages
Powerful Essays -
The block reached its maximum velocity, or a specific amount of kinetic energy, at each falling distance. At 0.93 meters, the wooden friction block started to show rising velocity at a distance of 0.93 meters. It reached a maximum speed of 1.193 m/s with a kinetic energy of 0.134 J. Figure 2 - A graph at a height of 0.93 meters with X Position (m) Vs. Time (s). At 0.85 meters At a distance of 0.85 meters, the wooden friction block showed an increasing velocity, peaking at approximately 1.099 m/s with a corresponding kinetic energy of 0.116 J.…
- 865 Words
- 4 Pages
Powerful Essays -
3. We will now use energy considerations to find the speed of a falling object at impact. Artiom is on the roof replacing some shingles when his 0.55 kg hammer slips out of his hands. The hammer falls 3.67 m to the ground. Neglecting air…
- 701 Words
- 3 Pages
Good Essays -
2. A car travels at a speed of 25 m/s on a flat stretch of road. The driver must maintain pressure on the accelerator to keep the car moving at this speed. What is the net work done on the car over a distance of 250 m?…
- 1941 Words
- 8 Pages
Good Essays -
A loaded freight car has 5 times as much mass as an empty freight car. If the loaded car coasts at 5 m/s and collides with and attaches to the empty car at rest, what will be the speed of both cars after collision?…
- 3581 Words
- 15 Pages
Good Essays -
As light passes from one medium into another, it refracts. There is only one condition in which light will cross a boundary but not refract. State this condition.…
- 3378 Words
- 14 Pages
Good Essays -
The block moves up an incline with constant speed. What is the total work WTotal done on the block by all forces as the block moves a distance L = 3.40 m up the incline? Include only the work done after the block has started moving at constant speed, not the work needed to start the block moving from…
- 814 Words
- 4 Pages
Good Essays