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Two youngsters are playing on one icy lake. Kid 1 weighs 50kg, and child 2 weighs 38kg. Boy 1 has actually a backpack that weighs 10kg, and child 2 has actually a backpack the weighs 5kg.

You are watching: Which of the following is not a conservative force

Over the food of the afternoon, they collide countless times. Four collisions are defined below.

Collision 1:

Child 1 starts native the height of a ramp, and also after walking down, get the lake surface while going 5m/s and also subsequently slides right into a stationary son 2. Lock remain attached together ~ the collision.

Collision 2:

Child 1 and also child 2 space sliding in the exact same direction. Child 2, moving at 10m/s, slides into child 1, relocating at 2m/s.

Collision 3:

The two youngsters collide while travel in opposite directions at 10m/s each.

Collision 4:

The two children push turn off from one another’s back, and begin relocating in exactly opposite directions. Boy 2 moves with a velocity the +8m/s.


Regarding the pressure of heaviness pulling boy 1 under the ramp, and also the pressure of friction acting on the two kids moving after ~ the collision __________.


Possible Answers:

friction is a conservative force and gravity is a nonconservative force


friction is a nonconservative force and also gravity is a conservative force


both are conservative forces


the conservative nature of pressures depend ~ above the bodies being acted upon


both room nonconservative forces


Correct answer:

friction is a nonconservative force and also gravity is a conservative force


Explanation:

Conservative forces are connected with a potential energy. The gravitational force that offers rise to the potential power of boy 1 in ~ the peak of the ramp is conserved, in a sense, together she converts it come kinetic energy during her trip down to the lake surface.

Friction has actually no connected potential energy, and also so is taken into consideration nonconservative.


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Example question #425 : Mcat Physical sciences


Which that the complying with is not a conservative force?


Possible Answers:

Gravity


Electrostatic repulsion


Friction


Electrostatic attraction


Correct answer:

Friction


Explanation:

Friction is a non-conservative force, meaning that the occupational it does depends on the course taken by the object. For example, moving a brick in a long zig-zag across the table will generate more heat native friction than moving it in a directly line throughout the table.

Electric and also gravitational pressures are conservative. This deserve to be experiment by understanding a consistent equation to calculate the energy connected with this forces; such equations are applicable nevertheless of path. No together equation exists because that frictional energy.


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Example question #426 : Mcat Physical scientific researches


A 2kg lead ball is loaded into a spring cannon and the cannon is set at a 45º angle on a platform. The spring has a spring consistent of 100N/m and the ball and spring device is compressed by 1m before launch. When the round is in trip air resistance have the right to be neglected, and the ball finishes its trip by landing in ~ a cushion put some distance away native the cannon.


If wait resistance might not be neglected, exactly how should the positioning of the cushion change?


Possible Answers:

Closer


Further


Same Location


Not enough Information to Determine


Correct answer:

Closer


Explanation:

Air resistance is a type of friction that acts in the direction the contrary motion, slowing down an object. If the ball spends less time in flight, it will certainly travel much less of a distance, inquiry the cushion to be put closer come the start position.


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Example question #427 : Mcat Physical sciences


Which the the following basic forces is the weakest in magnitude?


Possible Answers:

Gravitational force


Weak force


Electromagnetic force


Nuclear force


Correct answer:

Gravitational force


Explanation:

While one can expect the "weak" pressure to be the weakest that the 4 universal forces, the gravitational force is actually several orders of size weaker than the weak force.

In bespeak from the strongest to weakest, the an essential forces are the strong (nuclear) force, electromagnetic force, weak force, and gravitational force.


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Example concern #1 : Other pressures


Which the the following forces is no conservative?


Possible Answers:

Frictional


Gravitational 


Elastic 


Electrostatic


Correct answer:

Frictional


Explanation:

Conservative pressures are forces that perform not lose power to heat, sound, or light. Of this answers, energy is totally conserved and also transferred from kinetic energy to potential energy, or vice versa. Gravitational forces, electrostatic forces, and also elastic pressures all work-related by giving a potential the will work-related in the same direction as the motion of an item or particle, enabling kinetic and potential power to interconvert. Frictional pressures lose power as warmth when sliding throughout a surface, and also the more force (the more rough the surface), the much more energy the is lost.


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Example concern #71 : forces


A 2kg mass is suspended on a rope that wraps approximately a frictionless wheel attached to the ceiling with a fixed of 0.01kg and a radius the 0.25m. The other end of the rope is attached come a massless rely platform, ~ above which 0.5kg weights may be placed. While the system is originally at equilibrium, the rope is later cut above the weight, and the communication subsequently elevated by pulling ~ above the rope.


If, rather of utilizing one pulley-block to raise the communication after that falls, we made decision to use two, just how would the pressure required to lift the communication change?


Possible Answers:

Increase by 4 times


Decrease through 4 times


Decrease by 1/2


Increase through 1/2


Correct answer:

Decrease by 1/2


Explanation:

One-half of the pressure will be compelled to traction the platform up in the brand-new scenario. In the chart below, now an alert that the box has actually two upward stress forces due to the wheel attached directly to the box. These 2 tension forces act versus the load of the box, an interpretation that each tension pressure is one half of the weight of the box. Since tension is transmitted unmodified over the length of the rope, the stress a human would should pull versus would be half the load of the box. This leads united state to recognize that fifty percent the force would be compelled to lift the box if 2 pulleys to be used.


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Example inquiry #72 : pressures


Two college student (student X and student Y) elevator a boulder vertically from point A to allude B. College student X straight lifts the boulder from point A to allude B, whereas student Y supplies a pulley to background the boulder. This enables student Y to use a pressure () that is three times smaller than the force used by college student X (). Both students apply force upwards and also take the same amount that time to finish this task.

The vertical distance between suggest A and allude B is .


Student Z provides a frictionless inclined aircraft to elevator the boulder and has to use only a third of

*
. I m sorry of the following is true regarding the inclined aircraft and the sheave (used by college student Y)?


Possible Answers:

The pulley has actually a greater mechanical advantage than the skinny plane


The inclined aircraft has a greater mechanical advantage than the pulley


More information is required to determine the loved one mechanical advantage


The pulley and also the inclined airplane have the same mechanical advantage


Correct answer:

The pulley and also the inclined airplane have the same mechanical advantage


Explanation:

The inquiry states that:

*

Recall the the passage claims that 

*
is additionally one third of
*
.

*

The pressure exerted by college student Y and student Z is the same.

*

Mechanical advantage is characterized as:

The weight of the thing is the same for both students due to the fact that both the them are lifting the very same boulder. The force used is additionally the same; therefore, mechanical advantage for both equipments is the same.


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Example question #73 : forces


Two students (student X and student Y) lift a boulder vertically from point A to suggest B. Student X directly lifts the boulder from point A to allude B, whereas college student Y offers a sheave to elevator the boulder. This allows student Y to use a force () the is three times smaller than the force used by college student X (). Both students apply force upwards and take the exact same amount the time to complete this task.

The vertical street between point A and suggest B is .


If the pulley has a mechanical advantage of 

*
and also
*
, what is the weight of the boulder?


Possible Answers:

*


*



*


Correct answer:


Explanation:

The an interpretation of mechanical advantage is:

Rearranging this equation and also solving for weight gives:

*

*

Mechanical advantage is a unitless quantity. Mental the difference in between weight and also mass. Load is a measure up of force and also has units of Newtons, whereas mass has units of kilograms.


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Example inquiry #74 : forces


A 2kg object drops from a elevation of 3m ~ above a spring, i m sorry compresses 20cm. What is the spring constant?


Possible Answers:

*


Correct answer:

*


Explanation:

Conservation of power is the key here. Initial power is every gravitational potential energy:

*
 

Note the the final height change is same to the height above the spring added to the displacement that the spring.

See more: What Is The Main Characteristic Of A Strong Acid ? What Is The Main Characteristic Of A Strong Acid

This is same to the final energy, i beg your pardon is all spring potential energy:

*

Set these equations equal and solve for the spring constant.

*

*

*

*


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