6345

Physics Force & Laws Of Motion Level: Misc Level

The kinetic friction of one metal object sliding along another metal surface depends least upon:The nature of the materials in contact, the coefficient of kinetic friction, the area of contact,the normal force.


6344

Physics Force & Laws Of Motion Level: Misc Level

A 10 kg mass,hung onto a spring, causes the spring to stretch 2 cm, the springs constant is.


6343

Physics Force & Laws Of Motion Level: Misc Level

To push a piece of heavy furniture across the carpet usually takes more force to get it moving than it takes to keep it moving. This is because:Of Newton,s 3rd law, the static coefficent of friction is larger than the kinetic coefficient,it does not take more force, or the kinetic coefficient of friction is larger than the static coefficient.


6342

Physics Force & Laws Of Motion Level: Misc Level

A wooden block slides directly down and inclined plane, at a constant velocity of 6 m/s. How large is the coefficient of kinetic friction, if the plane makes an angle of 25 degrees with the horizontal?


6341

Physics Force & Laws Of Motion Level: Misc Level

Consider a plot of the displacement on the y axis vs. applied force on the x axis for an ideal elastic spring. The slope of the curve would be:The reciprocal of the spring constant, the spring constant, the acceleration of gravity, the reciprocal of the acceleration of gravity.


6338

Physics Force & Laws Of Motion Level: Misc Level

A Packing car slides down an inclined plane at a constant velocity. Thus We Can deduce that:A net downward force is action on it, it is not acted on appreciable gravitational force, it may be accelerating,a frictional force is acting on it.


6297

Physics Force & Laws Of Motion Level: Misc Level

A 200 g ball hits a wall perpendicularly witha velocity of 30 m/s and rebounds with a velocity of 20 m/s.If the collision lasts for 5 milliseconds, find the average force exerted by the ball on the wall.

a.1000 N

b.4000N

c.6000 N

d.2000 N


6289

Physics Force & Laws Of Motion Level: Misc Level

In a perfectly elastic collision:

a. Momentum and kinetic energy are conserved.

b. Momentum is not conserved but kinetic energy is.

c.Neither momentum nor kinetic energy is conserved.

d.Momentum is conserved but not kinetic energy.


6287

Physics Force & Laws Of Motion Level: Misc Level

A car is traveling downhill with a constant velocity. Which of the following statements is true?

a.there is net vertical force acting on the car.

b. The is a net force on the car in the uphill direction.

c.The is a net force acting on the car in the downhill direction.

d. The is no net force acting on the car.


6278

Physics Force & Laws Of Motion Level: Misc Level

A car traveling at 20 m/s is brought to a halt by applying the brakes in 4 s. What is the magnitude of acceleration of the car?

a. 4 m/s2

b.3 m/s2

c.5 m/s2

d.2 m/s2


6276

Physics Force & Laws Of Motion Level: Misc Level

A cylindrcal specimen of steel of cross- sectional area 5 cm2 is subjected to a tensile force of 800 N. The stress in the material is:

a. 3.2 x 106 N/m2

b.8.0 x103 N/m2

c.4.0 x 103 N/m2

d.1.6 x 106 N/m2


6271

Physics Force & Laws Of Motion Level: Misc Level

A safe with a mass of 150 kg is at rest on the floor. What is the minimum horizontal force needed to move the safe if the coefficient of static friction between the safe and the floor is 0.3?

a. 441 N

b.501 N

c.51 N

d. 41 N


6231

Physics Force & Laws Of Motion Level: Misc Level

 A catcher stops a 84 mi/h pitch in glove ,bringing it to rest in 0.17 m. If the force exerted by the catcher is 803 N, what is the mass of ball?


6230

Physics Force & Laws Of Motion Level: Misc Level

 In a grocery store, you push a 14.5 kg shopping cart with a force of 10.0 N If the cart start at rest, how far does it move in 3.00 s?


6221

Physics Force & Laws Of Motion Level: Misc Level

A 200 g ball hits a wall perpendicularly with a velocity of 30 m/s and rebounds back perpendicularly with a velocity of 20 m/s.If the collision lasts for 5 ms, find the average force exerted by the ball on the wall.

a. 4000 N

b. 2000 N

c. 6000 N

d. 1000 N

 


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