taller (FISICA)

Taller de Leyes de Newton 6º

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) Galileo's Law of Inertia is the same as

A) Newton's Law of Universal Gravitation.

B) Newton's Second Law.

C) Newton's First Law.

D) Kepler's Law.

E) Newton's Third Law.

2) In the absence of an external force, a moving object will

A) gradually speed up until it reaches its terminal velocity.

B) stop immediately.

C) move with constant velocity in a circular orbit.

D) slow down and eventually come to a stop.

E) move with constant velocity in a straight line.

3) An object is moving with constant velocity in a straight line. Which of the following statements is

true?

A) A constant force is being applied in the direction of motion.

B) There is no frictional force acting on the object.

C) There are no forces acting on the object.

D) A constant force is being applied in the direction opposite of motion.

E) The net force on the object is zero.

4) You try to pull an object by tugging on a rope attached to the object with a force F. The object

does not move at all. What does this imply?

A) The inertia of the object prevents it from accelerating.

B) The object has reached its natural state of rest and can no longer be set into motion.

C) There are no other forces acting on the object.

D) There are also one or more other forces that act on the object with a sum -F.

E) The rope is not transmitting the force to the object.

5) You are standing in a moving bus, and you suddenly fall backward. You can imply from this that

the bus's

A) the bus stopped.

B) speed remained the same, but it's turning to the left.

C) velocity decreased.

D) velocity increased.

E) speed remained the same, but it's turning to the right.

6) Two cars collide head-on. At every moment during the collision, the magnitude of the force the

first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on

the first. This is an example of

A) Newton's law of gravitation. B) Newton's first law.

C) Newton's second law. D) Newton's third law.

Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com)7) A force of 120 N is applied to an object whose mass is 30 kg. The object's acceleration is

A) 2.0 m/s2.

B) 3600 m/s2.

C) 150 m/s2.

D) 0.25 m/s2.

E) 4.0 m/s2.

8) If a force accelerates 4.5 kg at 40.m/s2, that same force would accelerate 18. kg by how much?

A) 40. m/s2

B) 10. m/s2

C) 32. ft/s2

D) 0.16 km/s2

E) 0.18 km/s2

9) An object maintains its state of motion because it has

A) acceleration.

B) weight.

C) speed.

D) mass.

E) all of these

10) A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected,

the force required to keep the puck sliding at constant velocity is

A) equal to the weight of the puck.

B) the weight of the puck divided by the mass of the puck.

C) the mass of the puck multiplied by 10 m/s/s.

D) 0 N.

E) none of these