Question

Is the normal force exerted on an object always equal to the object's weight?

Answer #1

No. The normal force exerted on an object need not be equal to its weight all the time. It depends on the position of the object with respect to the reference frame.

For example consider the two situations given below

1) Object of mass M at rest on a horizontal surface

2) The same object on an incline at an angle of with respect to the horizontal.

In the first case Normal force is equal to the weight of the object in magnitude. But in the second case the normal force is not equal to weight.

True or False
___1.Normal force is that exerted by a surface on an object that
is resting on it and is always parallel to that surface.
___2.In the law of action and reaction, the pairs of forces act on
different objects.
___3.Newton's second law states that the force applied to an object
is inversely proportional to the acceleration that is applied to
this object due to this force.

1. An object weighs 3300 N. What is the
object's mass?
____ kg
2. An object weighs 3000 lb. What is the object's weight in
N?
____N
3. An object weighs 2700 N. What is the object's weight in
lb?
____ lb
4. The mass of a certain elephant is 3,867 kg.
(a) Find the elephant's weight in newtons.
____ N
(b) Find its weight in pounds.
____ lb

The gravitational force exerted on a solid object is 6.0 N. When
the object is suspended from a spring scale and immersed in water,
the reading on the scale is 3.00 N. Find the density of the
object.

17. Action-reaction forces in third Newton’s law:
a. Always act on the same object.
b. Sometimes act of the same object.
c. Always act on different objects.
d. May or may not be antiparallel to each other.
18. If force exerted by horse on a cart is equal and opposite to
the force exerted by cart on a horse, how does horse manage to move
a cart?
a. Horse has bigger mass than a cart.
b. Horse still exerts greater...

The Normal force always opposes the Weight force.
A.)True
B.)False
If a ball on a string is being spun around in a circle that is
perpendicular to the ground, at what point of the ball’s motion is
it being pulled on by the rope the hardest?
A.)At the bottom
B.)At the top
C.)45 degrees from top
D.)90 degrees from top

A constant force is applied to an object, causing the object to
accelerate at 7.00 m/s2 . What will the acceleration be if...
a.) The force is doubled?
b.) The object's mass is doubled?
c.) The force and the object's mass are both doubled?
d.) The force is doubled and the object's mass is halved?

Consider a spinning space station, the normal force exerted by
the wall keeps the astronauts in circular motion. They feel the
normal force like the gravity on Earth. If we want a space station
spinning at one revolution per minute to have an apparent gravity
equal to that on Earth, what should be the radius of the station?
Is that a reasonable size? Explain your opinion.

When a falling object experiences air resistance, it will
eventually reach terminal velocity and no longer accelerate. This
will happen when the force of air resistance
Group of answer choices
is less than the force of gravity acting on the object.
is equal to the object's weight.
is greater than the force of gravity acting on the object.
approaches zero.

Compare the weight of a 5.40-kg object on Earth's surface to the
gravitational force between a 5.40-kg object that is one Earth
radius from another object of mass equal to 5.98 ×× 1024
kg. Use Newton's universal law of gravitation for the second part
of the question.
2)
Determine the gravitational force an Earth radius away.
(Express your answer to three significant figures.)

A 10-kg box is sitting at rest on a ramp. The normal force
exerted on the box by the ramp is 91 N.
a) What condition must be true if the box is in static
equilibrium?
b) What is the strength of the friction force holding the box in
place?

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