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;


6889

Physics Force & Laws Of Motion Level: Misc Level

The'' reaction'' force does not cancel the action'' force because;

a. the action force is greater than the reaction force

b. they act on different bodies

c. they are in the same direction

d. thereaction force exists only after the action force is removed

e. the reaction force is greater than the action force


6886

Physics Force & Laws Of Motion Level: Misc Level

A heavy wooden block is dragged by a force e along a rough steel plate, as shown below for cases. The magnitude of the applied force c is the same for both cases. The normal force in (ii) as compared with the normal force in  (i) is;

a. the same

b.greater

c. less

d. leass for some angles of the incline and greater for 

d. others

e. less or greater, depending on the magnitude of the applied force c.


6839

Physics Force & Laws Of Motion Level: Misc Level

Mass differs from weight in that;

a. all objects have weight but some lack mass

b. weight is a force and mass is not

c. the mass of an object is always more than its weight

d. mass can only be expressed in the metric system

e. there is no difference


6838

Physics Force & Laws Of Motion Level: Misc Level

The inertia of a body tends to cause the body to;

a. speed up

b. slow down 

c. resist any change in its motion

d. fall toward the Earth

e. decelerate due to friction


6837

Physics Force & Laws Of Motion Level: Misc Level

The term" mass" refers to the same physical concept as;

a. weight

b. inertia

c. force

d, acceleration

e. volume


6836

Physics Force & Laws Of Motion Level: Misc Level

Acceleration is always in the direction;

a. of the displacement

b. of the initial velocity

c.of the final velocity

d. of the net force

e. opposite to the frictional force


6835

Physics Force & Laws Of Motion Level: Misc Level

The standard 1- kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a 

a. 2.8 N

b.5.6 N

c.11.2 N

d. 0

e. an undetermined amount


6788

Physics Force & Laws Of Motion Level: Misc Level

An example of an inertial reference frame is;

a. any frame that is not accelerating

b. a frame attached to a particle on which no forces act

c. any frame that is at rest

d. a frame attached to the center of the universe

e. a frame attached to the Earth


6785

Physics Force & Laws Of Motion Level: Misc Level

If you know the impuise that has acted on a body of mass m you can calculate 

a. its initial velocity.

b.its final velocity.

c.its final momentum.

d.the change in its velocity.

e.its acceleration during the impulse.


6784

Physics Force & Laws Of Motion Level: Misc Level

A car of mass m1 traveling at velocity v passes a car of mass m2 parked at the side of the road. The momentum of the system of two cars is 

a.0.

b.m1 v.

c. (m1-m2)v.

d.m1v

m1 +m2

e. (m1+m2) v.


6781

Physics Force & Laws Of Motion Level: Misc Level

A 4.0 -kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall.The partical rebounds with a speed of 3.0 m/s. What is the magnitude of the impulse delivered to tthe particle?

a. 24 N-s

b.32 NN ss

c. 400 NN ss

d. 30N .s

e. 8.0 N.s


6780

Physics Force & Laws Of Motion Level: Misc Level

A 1.2 kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction .If the object is in contact with the wall for 2.0 ms. what is the magnitude of the average force on the object by the wall?

a. 9.8 kN

b.8.4 kN

c. 7.7 kN

d. 9.1 kN

e.1.2 kN


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