Physics Quiz

A car (mass m1) is driving at velocity v, when it smashes into an unmoving car (mass m2), locking bumpers. Both cars move together at the same velocity. The common velocity will be given by:

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Neglecting friction, find the tension in the thread connecting m1 and m2.

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What is the direction to which a fish must push the water with its fins in order to propel eastward?

Neglecting friction, find the tension in the thread connecting 푚1 and 푚2.

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What is the direction to which a fish must push the water with its fins in order to propel eastward?

• Eastward

• Upward

• Westward

• Downward

If two particles have equal momenta, which one of the following statements is TRUE about their kinetic energies?

• Their kinetic energies are always equal.

• Their kinetic energies are never equal.

• Their kinetic energies are equal when their masses are equal.

• Their kinetic energies are equal when the speed of one of the particles is half the speed of the other and their masses are the same.

When an object is pulled by a string it exerts a force on the object. Such a force in a string is called________________.

• Frictional force

• External force

• Tension force

• Normal force

Which one of the following is FALSE about the velocity of a body under uniform circular motion?

• The magnitude of the velocity is constant throughout the motion.

• The velocity at a point directed towards the center of the rotation.

• The velocity at a point is perpendicular to the acceleration.

• The tangential component of the velocity is zero.

Which one of the following statements is true about action and reaction forces referred to in Newton’s third law of motion?

• They act on the same body.

• They act upon two different bodies.

• They are equal in magnitude but need not have the same line of action.

• They are not equal in magnitude but have the same line of action

If a force F results an acceleration a when acting on a mass M, then doubling the mass and increasing the force four times will result in an acceleration of:

• ½ a

• 2a

• a

• 4a