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How much force a walking man exerts on the ground A A force greater than his weight B A force equal to his weight C A force less than his weight D A force not related to his weight?
A
What is the reaction force of a man pushing a car?
Let's first imagine the man pushing on a car with the handbrake on. Obviously, the car does not move. The man is applying a force F (let us call it F1). The static friction of the brakes on the car are applying a force we shall call F2.Now, we know from Newton's laws that F = mass x acceleration (F = ma). The car is not accelerating, so F = 0. That is the net force of the man/car system is zero. So, F1 + F2 = 0, or if you prefer, F1 = -F2.In this case, the force of the man's feet on the ground cannot overcome the force of the brakes on the wheels. So the car does not move.Now, what happens if we release the handbrake? If enough force is applied to overcome the friction of the wheels and axles etc, the car will accelerate (a).The man's feet exert a force on the ground and the ground exerts an equal and opposite for on the man's feet. (Newton's 3rd law)The friction of the wheels exerts a force on the ground and the ground exerts an equal and opposite force on the wheels. (Newton's 3rd law)The man exerts a force on the car... and the car exerts an equal and opposite force on the man (3rd law)But, the force of the man's feet on the ground is greater than the opposing force of the wheel's friction on the ground. Therefore, there is a net force and the "man + car" system accelerates. Note that Newton's 3rd law applies to each pair of objects (car/ground), (car/man), (man/ground) seperately.
What is the magnitude of gravity the earth exerts on a man with a mass of 80.0kg?
Here we have to be precise with the terms that we use. Gravity is the property of an massive body. Gravitational force is the force between two massive bodies. Acceleration due to gravity is the acceleration produced in a body due to gravitational pull on it. And it is constant at a particular. place and independent of the size , mass and nature of the body. If M is the mass then Mg is the gravitational pull on it. So 80 kg would have a force of gravity = 80 * 9.8 N
What is the force of gravity on a 500N man stading on the earth's surface?
If the bathroom scale reads 500N when the man stands on it, then that's a clear indication that the force of gravity between the man and the Earth is 500N. That number is referred to as the man's "weight" on Earth. It's also the Earth's weight on the man.
A man pulls a 50 kilogram box 20 meters across the floor with the aid of a rope tied to the box The rope makes an angle of 30 degrees with the horizontal In pulling the box the man exerts a force of?
1,732 J
A man and a woman exert a total of 900 N by pushing a car 20 meters across the street. The man exerts twice as much force as the woman. How much work does the man do?
The man exerts a force of 600 N and the woman exerts a force of 300 N. Work done by the man = Force x displacement = 600 x 20 = 12,000 J Hence, the man performs 12,000 joules of work.
A man pushes on a wall with a force of 5o What are the size and the direction of the force that the wall exerts on the man?
Same force, opposite direction (according to Newton's Third Law).
A 200 lb man exerts 882 Newtons on earth how many Joules is that?
Joules is the unit of work being done. A 200 Ib man exerts 882 Newtons is not getting any work done. If 882 Newtons, which is the force, was multiplied by 0 movement, then the 200 Ib man is exerting 0 joules.
A man exerts a force of 500 newton on a 50kg box the box accelerates at 9ms2 what is the friction force of the box?
50 Newton.
How much force a walking man exerts on the ground A A force greater than his weight B A force equal to his weight C A force less than his weight D A force not related to his weight?
A
Only the earth exerts gravitional force on all object is it true?
Anything with mass include you and me do exert gravitational force but the earth is massive so it exert more force than any of any small object including us on earth. The gravitational force is done between two mass in following general gravitational law by Newton. F = G.M1m2/R2 We sum up G.M1/R2 as gravity = 9.81 m/s2 for M1 is earth and R = earth radius Between 2 man with m1 and m2 respectively, gravitational force between these two man is at F = G.m1m2/L2 where L = distance between center of mass (you and me for instance). Gravitational force is small compare to earth's gravitational force but it does exist.
What is the reaction force of a man pushing a car?
Let's first imagine the man pushing on a car with the handbrake on. Obviously, the car does not move. The man is applying a force F (let us call it F1). The static friction of the brakes on the car are applying a force we shall call F2.Now, we know from Newton's laws that F = mass x acceleration (F = ma). The car is not accelerating, so F = 0. That is the net force of the man/car system is zero. So, F1 + F2 = 0, or if you prefer, F1 = -F2.In this case, the force of the man's feet on the ground cannot overcome the force of the brakes on the wheels. So the car does not move.Now, what happens if we release the handbrake? If enough force is applied to overcome the friction of the wheels and axles etc, the car will accelerate (a).The man's feet exert a force on the ground and the ground exerts an equal and opposite for on the man's feet. (Newton's 3rd law)The friction of the wheels exerts a force on the ground and the ground exerts an equal and opposite force on the wheels. (Newton's 3rd law)The man exerts a force on the car... and the car exerts an equal and opposite force on the man (3rd law)But, the force of the man's feet on the ground is greater than the opposing force of the wheel's friction on the ground. Therefore, there is a net force and the "man + car" system accelerates. Note that Newton's 3rd law applies to each pair of objects (car/ground), (car/man), (man/ground) seperately.
What is the magnitude of gravity the earth exerts on a man with a mass of 80.0kg?
Here we have to be precise with the terms that we use. Gravity is the property of an massive body. Gravitational force is the force between two massive bodies. Acceleration due to gravity is the acceleration produced in a body due to gravitational pull on it. And it is constant at a particular. place and independent of the size , mass and nature of the body. If M is the mass then Mg is the gravitational pull on it. So 80 kg would have a force of gravity = 80 * 9.8 N
What is the force of gravity on a 500N man stading on the earth's surface?
If the bathroom scale reads 500N when the man stands on it, then that's a clear indication that the force of gravity between the man and the Earth is 500N. That number is referred to as the man's "weight" on Earth. It's also the Earth's weight on the man.
A 330-kg piano slides 3.6 m down a 28 incline and is kept from accelerating by a man who?
Exerts a force against it sliding down.
What is the mass of a man that is pulled by a force of 490N by earth?
F = m Am = F/A = 490/9.8 = 50 kg.By the way, the man also pulls the earth with a force of 490 newtons.
A man pulls a 50 kilogram box 20 meters across the floor with the aid of a rope tied to the box The rope makes an angle of 30 degrees with the horizontal In pulling the box the man exerts a force of?
1,732 J
