 # Force, motion and energy problems and answers

Recent questions in Force, Motion and Energy Stoyanovahvsbh 2022-05-15 Answered

### Does GR imply a fundamental difference between gravitational and non-gravitational acceleration?1.Does the equivalence principle imply that there is some fundamental difference between acceleration due to gravity and acceleration by other means (because there is no way to 'feel' free fall acceleration for a uniform gravitational field)?2.Does General Relativity allow you to describe the acceleration due to gravity without Newton's second law (because every other source of 'push or pull' outside the nucleus involves the electromagnetic field)?3.Is the acceleration due to gravity a result of changes in time dilation/length contraction as opposed to an actual push or pull?\ Jayla Faulkner 2022-05-14 Answered

### An electron and a positron are separated by distance r. Findthe ratio of the gravitational force to the electric force betweenthem. From the result, what can you conclude concerning theforces acting between particles detected in a bubble chamber?(Should gravitational interactions be considered?) vulkanere64t6 2022-05-14 Answered

### How is the gravitational force between two point masses affected when they are dipped in water keeping the seperation between them the same? Dominick Blanchard 2022-05-14 Answered

### (a) Calculate the gravitational force exerted on a 5.00 kg baby by a 90 kg father 0.200 m away at birth (assisting so he is close).(b) Calculate the force on the baby due to Jupiter if it is at its closest to the earth, some $6.29×{10}^{11}m$ away, showing it to be comparable to that of the father. The mass of Jupiter is about . Other objects in the room and the hospital building also exert similar gravitational forces. Jayden Mckay 2022-05-13 Answered

### The only known force a planet exerts on Earth is gravitational. (a) Calculate the magnitude of the gravitational force exerted on a 4.20 kg baby by a 100 kg father 0.200 m away at birth (he is assisting, so he is close to the child). (b) Calculate the magnitude of the force on the baby due to Jupiter if it is at its closest distance to Earth, some away. How does the force of Jupiter on the baby compare to the force of the father on the baby? Other objects in the room and the hospital building also exert similar gravitational forces. (Of course, there could be an unknown force acting, but scientists first need to be convinced that there is even an effect, much less that an unknown force causes it.) Reese Estes 2022-05-13 Answered

### Two balls have their centers 2.0 m apart. One ball has a mass of 8.0 kg. The other has a mass of 6.0 kg. What is the gravitational force between them? Elle Weber 2022-05-13 Answered

### What is the electric potential at the point indicated with the dot in the figure? Express your answer to two significant figures and include the appropriate units.photo mars6svhym 2022-05-13 Answered

### What is the jerk due to gravity with ascent? Acceleration is defined as the rate of change of velocity with time. Jerk is defined as the rate of change of acceleration with time. What is the jerk due to gravity with ascent? ga2t1a2dan1oj 2022-05-13 Answered

### When an object, say a ball, is attracted by the black hole it gets acceleration due to gravity. Suppose light is moving towards the black hole vertical to it... then does it gain acceleration due to gravity? If yes then won't be the speed of light increase and get violated? Jaeden Weaver 2022-05-13 Answered

### Why do we use gravitational force in earth by relating just the mass of an object with the acceleration produced by the gravitational field:${F}_{g}=m\cdot \stackrel{\to }{g}$And when we're dealing with planets, we use a relation defined by the masses of two planets, distance squared and gravitational constant:${F}_{g}=G\cdot \frac{{M}_{1}\cdot {M}_{2}}{{d}^{2}}$I really don't get why we use just the first relation here on earth, because we're dealing with a interction between two objects... It's because our mass is irrelevant?? Matilda Webb 2022-05-10 Answered

### Is acceleration due to gravity constant?I was taught in school that acceleration due to gravity is constant. But recently, when I checked Physics textbook, I noted that$F=\frac{G{m}_{1}{m}_{2}}{{r}^{2}}.$So, as the body falls down, $r$ must be changing, so should acceleration due to gravity. fetsBedscurce4why1 2022-05-10 Answered

### Why do we integrate along the whole length while finding the gravitational force between a object of mass (m) and a rod of length L and mass M? Can't we simply use $F=\frac{GmM}{{r}^{2}}\phantom{\rule{thinmathspace}{0ex}}?$? sg101cp6vv 2022-05-10 Answered

### Two objects are attracted to each other with 36 N of gravitational force. What would the force between them be if the distance between them were doubled? syaoronsangelhwc17 2022-05-10 Answered

### Question regarding calculating acceleration due to gravity on planet Mercury I was asked to calculate the acceleration due to gravity on planet Mercury, if the mas of Mercury is $2,99×{10}^{22}kg$ and its radius is . The mass of the object is $10kg$ and the mass of Earth is $6×{10}^{24}kg$ and the Radius of the Earth is $3,82×{10}^{3}km$This question rather puzzled me because I was not sure if my answer is correct or not but let me proceed :$\stackrel{\to }{F}=m\stackrel{\to }{a}={F}_{g}=G\frac{{m}_{1}{m}_{2}}{{r}^{2}}$${m}_{1}g=G\frac{{m}_{1}{m}_{2}}{{r}^{2}}$(Note that ${m}_{2}$ = mass of mercury)I compute my answer to be $0.34\frac{m}{{s}^{2}}$What really is confusing me is that when I look at my textbook, it shows me the gravitational acceleration due to gravity on mercury to be $3.59\frac{m}{{s}^{2}}$Can someone please explain to me what the answer that I am getting is giving me? My computation was marked correct in a test but I do not understand what this value is giving me. agrejas0hxpx 2022-05-10 Answered

### Two objects, with masses ${m}_{1}$ and ${m}_{2}$, attract each other with force $F$. If the mass of ${m}_{1}$ increased by a factor of two then the new gravitational force would be: F/42 F4 FF/2 Azzalictpdv 2022-05-10 Answered

### Why do two bodies of different masses fall at the same rate (in the absence of air resistance)?I'm far from being a physics expert and figured this would be a good place to ask a beginner question that has been confusing me for some time.According to Galileo, two bodies of different masses, dropped from the same height, will touch the floor at the same time in the absence of air resistance.BUT Newton's second law states that $a=F/m$, with $a$ the acceleration of a particle, $m$ its mass and $F$ the sum of forces applied to it.I understand that acceleration represents a variation of velocity and velocity represents a variation of position. I don't comprehend why the mass, which is seemingly affecting the acceleration, does not affect the "time of impact".Can someone explain this to me? I feel pretty dumb right now :) ureji1c8r1 2022-05-09 Answered

### Does Acceleration due to Gravity take into consideration the centrifugal acceleration due to Earth's spin?Is the gravitational acceleration we consider only the attraction due to the Earth's gravity or is it that of gravity plus the attraction due to Earth spinning?We know that earth produces an acceleration towards the centre on any body near it due to gravitational attraction.We denote this acceleration as $g$But we also know that any body on Earth is also undergoing rotational motion due to earth's Spin. So every body should experience an outward centrifugal acceleration.Does acceleration due to gravity $g$ take the centrifugal acceleration into consideration? enclinesbnnbk 2022-05-09 Answered

### A book is lifted upward a vertical distance of 0.800 m. Duringthis displacement, does the gravitational force acting on the book do positivework or negative work? Does the gravitational potential energy of thebook increase or decrease? Blaine Stein 2022-05-09 Answered

### Compare the gravitational attraction between objects on earth and interaction of celestial bodies in space. Which gravitational force is almost negligible? Why? rockandriot0odjn 2022-05-09 Answered