Physics test #1

A theory in the field of science is? A)an educated guess. B)less than a fact. C)a synthesis of a large body of well-tested knowledge. D)unchangeable. E) none of the above

C) A synthesis of a large body of well-tested Knowledge

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

C) 14 m/s.

A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is approximately... A) 30 N. B) 300 N. C) 3000 N. D) more than 3000 N.

C) 3000 N.

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) about 30 m/s. D) more than 30 m/s.

C) about 30 m/s.

If an apple experiences a constant net force, it will have a constant A) velocity .B) speed. C) acceleration. D) position. E) more than one of the above

C) acceleration.

The amount of force needed to sustain motion of a rock in outer space is... A) a force equal to its weight. B) a force less than its weight if friction is absent. C) none of these

C) none of these

Which of the following is a scientific statement? A) candy Bon Bons contain no sugar B) there are things we will never know about C) matter is filled with undetectable particles D) there are parts of the universe that will never be discovered by humans E) none of the above

A) candy Bon Bons contain no sugar

two students engaged in a tug-of-war each pull a rope in opposite directions with a force of 400 N. The net force on the rope is... A) zero and rope tension is 400 N. B) zero and rope tension is 800 N. C) 400 N and rope tension is 800 N. D) 400 N and rope tension is also 400 N.

A) zero and rope tension is 400 N.

15. You stand on your skateboard and exert a 50-N push on the wall next to you. If your mass is 60 kg you'll momentarily accelerate from the wall at about A) 0.08 m/s2. B) 0.8 m/s2. C) 8.0 m/s2. D) none of the above

B) 0.8 m/s2.

If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is... A) 3 m/s2. B) 6 m/s2 .C) 60 m/s2. D) 600 m/s2.

B) 6 m/s2.

14. When you walk, you push on the floor to the left and the floor... A) also pushes on you to the left. B) pushes you to the right. C) both of these simultaneously. D) can only wish it could push on you.E) none of the above

B) pushes you to the right.

The statement, "There are regions beneath Earth's crust that will always be beyond the reach of scientific investigation" is. A) a fact. B) speculation. C) a hypothesis. D) a scientific statement. E) a theory.

B) speculation.

A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock has the greater mass? A) the one on Earth B) the one on the Moon C) They have the same mass. D) not enough information

B) the one on the Moon

Which concept is being illustrated when a tablecloth is quickly yanked beneath dishes resting on a table? A) equilibrium B) friction C) support force D) inertia

D) inertia

Twelve seconds after starting from rest, a freely-falling cantelope has a speed of. A) 10 m/s. B) 50 m/s. C) 100 m/s. D) more than 100 m/s.

D) more than 100 m/s.