M2 Quiz

A block pulled to the left with 15 N and to the right with 5 N at the same time experiences a net force of A) 10 N. B) 20 N. C) 15 N. D) 5 N.

A

A force is a vector quantity because it has both A) magnitude and direction. B) speed and direction. C) mass and velocity. D) action and reaction counterparts.

A

A tree stump is pulled northward by a 10-N force at the same time a 25-N force pulls it southward. The resultant force has a magnitude of A) 15 N. B) 25 N. C) 0 N. D) 150 N.

A

At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately A) 40 m/s. B) 60 m/s. C) 50 m/s. D) 55 m/s.

A

The first scientist to be credited for postulating that Earth circled the Sun was A) Copernicus. B) Newton. C) Galileo. D) Aristotle.

A

The first scientist to introduce the concept of inertia was A) Galileo. B) Aristotle. C) Copernicus. D) Newton.

A

The speedometer of an automobile reads A) instantaneous speed. B) average speed. C) accelerated speed.

A

A freely-falling watermelon falls with constant A)distances each successive second. A) speed. B) acceleration. C) velocity.

B

A parallelogram is a four-sided figure with opposite sides that are A)none of the above B) parallel. C) at right angles. D) equal.

B

If you throw a ball straight downward (in the absence of air resistance), after leaving your hand its acceleration is A) less than 10 m/s2. B) 10 m/s2. C) greater than 10 m/s2.

B

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is A) less than 10 N. B) 10 N. C) more than 10 N.

B

When you flick a card from beneath a coin that hardly moves, you're illustrating A) friction. B) inertia. C) support force. D) equilibrium.

B

A hockey puck sliding across the ice finally comes to rest because A) that's just the way it is. B) it seeks its proper and natural state. C) of friction.

C

If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be A) 3600 m/s. B) 500 m/s. C) 3000 m/s. D) 50 m/s.

C

Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is A) 10 m/s. B) none of the above C) 6 m/s. D) 14 m/s.

C

The support force on a 10-N book at rest on a table is dependent on the position of the book. A) slightly less than 10 N. B) slightly greater than 10 N. C) 10 N.

C

When no forces act on moving objects their paths are normally all of the above A) ellipses. B) circles. C) straight lines.

C

A ball is thrown upwards and returns to the same location. Compared with its initial speed its speed when it returns is about A) four times as much. B) twice as much. C) half as much. D) the same.

D

A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about A) 6 km/h. B) 20 km/h. C) 8 km/h. D) 10 km/h.

D

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is A) zero. B) less than 30 m/s but more than zero. C) more than 30 m/s. D) about 30 m/s.

D

Which of the following is a vector quantity? A) mass B) volume C) area D) none of the above

D

Which of the following is not a vector quantity? A) velocity B) acceleration C) none are vector quantities. D) speed E) all are vector quantities

D

While a car travels around a circular track at a constant speed, its A) acceleration is zero. B) velocity is zero. C) none of the above D) inertia is zero.

c