Exam 5: The Laws of Motion

A 3.0-kg block slides on a rough horizontal surface.A force of 8.0 N acting parallel to the surface is applied to the block.The coefficient of kinetic friction between the block and the surface is 0.15.What is the magnitude of the block's acceleration?

If the only forces acting on a 2.0-kg mass are N and N,what is the magnitude of the acceleration of the particle?

A book is placed on a chair.Then a videocassette is placed on the book.The floor exerts a normal force

A 5.0-kg mass is attached to the ceiling of an elevator by a rope whose mass is negligible.What force does the mass exert on the rope when the elevator has an acceleration of 4.0 m/s² upward?

A book is placed on a chair.Then a videocassette is placed on the book.The floor exerts a normal force

Exhibit 5-1 A 2.30 kg mass is suspended from the ceiling and a 1.70 kg mass is suspended from the 2.30 kg mass,as shown.The tensions in the strings are labeled and . Use this exhibit to answer the following question(s). -Refer to Exhibit 5-1.The string supporting the 1.70 kg mass is cut.The magnitudes of the tension in string 1 before and after string 2 is cut are

The coefficient of kinetic friction between the surface and the larger block is 0.25,and the coefficient of kinetic friction between the surface and the smaller block is 0.40.If F = 22N and M = 1.0 kg in the figure,what is the magnitude of the acceleration of either block?

A 1.5-kg object has a velocity of 5 M/s at t = 0.It is accelerated at a constant rate for five seconds after which it has a velocity of (6 + 12 )m/s.What is the magnitude of the resultant force acting on the object during this time interval?

An astronaut who weighs 800 N on the surface of the earth lifts off from planet Zuton in a space ship.The free-fall acceleration on Zuton is 3.0 m/s² (down).At the moment of liftoff the acceleration of the space ship is 0.50 m/s² (up).What is the magnitude of the force of the space ship on the astronaut?

The horizontal surface on which the block slides is frictionless.If F = 20 N and M = 5.0 kg,what is the magnitude of the resulting acceleration of the block?

When the vector sum of three co-planar forces, , And ,is parallel to ,we can conclude that And

Exhibit 5-2 A 4.00 kg block is suspended from the roof of an elevator.A 2.00 kg block is suspended from the 4.00 kg block.The tensions in strings 1 and 2 are labeled and . Use this exhibit to answer the following question(s). -Which type of force would be the equal and opposite force to a gravitational force?

Only two forces act on a 3.0-kg mass.One of the forces is 9.0 N east,and the other is 8.0 N in the direction of 62° north of west.What is the magnitude of the acceleration of the mass?

When you drag a toy teddy bear along the floor by a force that is parallel to the floor,the magnitude of the force of friction

The first of two identical boxes of mass m is sitting on level ground.The second box is sitting on a ramp that makes an angle with the ground.When a force of magnitude F is applied to each box in a direction parallel to the surface it is on,upwards on the box on the ramp,neither box moves.Which statement comparing the friction force on the box on the level,f_L,to the friction force on the box on the ramp,f_R,is correct?

The frictional force of the floor on a large suitcase is least when the suitcase is

A chair is placed on a rug.Then a book is placed on the chair.The floor exerts a normal force

The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s².What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg.

Exhibit 5-1 A 2.30 kg mass is suspended from the ceiling and a 1.70 kg mass is suspended from the 2.30 kg mass,as shown.The tensions in the strings are labeled and . Use this exhibit to answer the following question(s). -A 6.00 kg block is placed on a 30.0° incline and connected to another block on a 36.87° incline.Although the surfaces are frictionless the blocks do not move.What is the mass in kilograms of the block on the 36.87° incline?

If F = 5.0 N,what is the magnitude of the force exerted by block 2 on block 1?