6898

Physics Force & Laws Of Motion Level: Misc Level

The system shown remains at rest. Find the force of friction on the upper block;


6897

Physics Force & Laws Of Motion Level: Misc Level

A  block is first placed on its long side and then on its short side on the same inclined plane. The block slides down the plane on its short side but remains at rest on its long side.A possible explanation is;

a. the short side is smoother

b. the frictional force is less because the contact area is less

c.case

d. the normal force is less in the second case

e. the force of gravity is more nearly down the plane in the second case


6896

Physics Force & Laws Of Motion Level: Misc Level

A 400-N block  is dragged along a rough (uk=0.4) horizontal surface by an applied force c as shown. The block moves at constant velocity. Find the magnitude of F;


6894

Physics Force & Laws Of Motion Level: Misc Level

A horizontal shove of at least 200-N is required to start moving a 800-N crate initially at rest on a horizontal floor. Find the coefficient of static friction is;


6893

Physics Force & Laws Of Motion Level: Misc Level

A brick slides on a horizontal surface. Which of the following will increase the friction force on it?

a. Putting a second brick on top

b. Decreasing the surface area of contact

c. Increasing the surface area of contact

d. Decreasing the mass of the brick 

e. None of the above


6892

Physics Force & Laws Of Motion Level: Misc Level

Two blocks with masses m and M are pushed along a horizontal frictionless surface by a horizontal applied force c as shown. The magnitude of the force that either of these blocks exerts on the other is;

a. mF/ m+M)

b.mF/M

c. mF (M-m)

d. MF(M+m)

e. MF/m


6891

Physics Force & Laws Of Motion Level: Misc Level

Three blocks (A,B, C),each having mass M, are connected by strings as shown. Block C is pulled to the right by a c that causes the entire system to accelerate. Neglecting friction, find the net force acting on block B;


6890

Physics Force & Laws Of Motion Level: Misc Level

Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown.

Calculate the tension in the string;


6671

Physics Force & Laws Of Motion Level: Misc Level

Consider a flat surface with a coefficient of friction of .20 with a 2.0 kg mass And a 3.0 kg mass connected together with a 6.0 kg mass along a slant as shown below. The coefficient of friction on the slant is zero. Calculate the acceleration of the system.


6509

Physics Force & Laws Of Motion Level: Misc Level

A 46.0 kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. What is the pressure exerted by the floor over the area of contact in the following cases? If the dancer is leaping upwards with an acceleration of 4.00 m/s2.---Pa


6507

Physics Force & Laws Of Motion Level: Misc Level

If the shear stress in steel exceeds about 3.70 108 N/m2, the steel ruptures.Determine the shearing force necessary to punch a 1.00 cm diameter hole in a steel plate 0.450 cm thick.-----N


6492

Physics Force & Laws Of Motion Level: Misc Level

Suppose that a girl weighing 125 pounds is wearing spike" heel shoes. If the surface of the heel in contact with the floor corresponds to a square measuring 1/4 on each side, and if she stands momentarily with all her weight on one heel, what is the pressure she exerts on the floor?

a.125 Ibs/in2

b. 500 Ibs/in2

c. 1000 Ibs/in2

d.1250 Ibs/in2

e. 2000 Ibs /in2


6490

Physics Force & Laws Of Motion Level: Misc Level

When a force is applied to a certain rod, there is a 1 cm change in length. If that same force is applied to a rod that is three times bigger in each dimension, what will be the change in length?

a. 9 cm

b. 3 cm 

c.1 cm 

d.0.33 cm 

e.0667 cm


6356

Physics Force & Laws Of Motion Level: Misc Level

If you blow up a balloon, and then release it,  theballoon will fly away as air rushes out. This is an illustration of-Galleo,s law of inertia, Newton,s 2 nd law, 1 or,st law or third law.


6348

Physics Force & Laws Of Motion Level: Misc Level

The force that a squirrel exerts on a nut it has found is observed over a 10 second interval, as shown in the graph. What is the average power exerted by the squirrel?


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