Physics Test 1 Part 2

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is A) 10 times as much B) zero. C) one-tenth as much. D) the same as the force on the 1-kg book.

A) 10 times as much

Two factors that greatly affect air resistance on falling objects are the A) size and speed of the object. B) size and weight of the object. C) size and mass of the object.

A) size and speed of the object.

Strange as it may seem, it is just as hard to accelerate a car on a level surface on the moon as it is here on the Earth. This is because A) the mass of the car is independent of gravity. B) the weight of the car is independent of gravity. C) Nonsense! A car is much more easily accelerated on the moon than on the Earth.

A) the mass of the car is independent of gravity.

A force of 1 N accelerates a mass of 1 kg at the rate of 1 m/s2. The acceleration of a mass of 2 kg acted upon by a net force of 2 N is A) the same. B) half as much. C) twice as much. D) none of these.

A) the same.

When a falling object has reached its terminal velocity, its acceleration is A) zero. B) constant. C) g.

A) zero.

An apple weighs 1 N. When held at rest above your head, the net force on the apple is A) 1 N. B) 0 N. C) 9.8 N. D) 0.1 N. E) none of these

B) 0 N.

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car? A) 3000 kg B) 1500 kg C) 1000 kg D) 500 kg E) none of these

B) 1500 kg

Two people, one twice as massive as the other, attempt a tug-of- war with 12 meters of massless rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of A) 0 m. B) 4 m. C) 3 m. D) 6 m.

B) 4 m.

The newton is a unit of A) inertia. B) force. C) density. D) mass.

B) force.

If a non-rotating object has no acceleration, then we can say for certain that it is A) moving at constant non-zero velocity. B) in mechanical equilibrium. C) at rest. D) all of these E) none of these

B) in mechanical equilibrium.

If an object's mass is decreasing while a constant force is applied to the object, the acceleration A) remains the same. B) increases. C) decreases.

B) increases.

In which case would you have the largest mass of gold? If your chunk of gold weighed 1 N on the A) Earth. B) moon. C) planet Jupiter.

B) moon.

A rocket becomes progressively easier to accelerate as it travels upward from the ground mainly because A) the mass of the rocket decreases as fuel is burned. B) the applied force on the rocket increases as burning of fuel progresses. C) gravity becomes weaker with increased distance.

B) the applied force on the rocket increases as burning of fuel progresses.

An object released from rest on another planet requires one second to fall a distance of 6 meters. What is the acceleration in meters per second per second due to gravity on this planet? A) 3 B) 15 C) 12 D) 6 E) none of these

C) 12

A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000 N. What is the jet's acceleration in meters per second per second when taking off? A) 4 B) 1 C) 2 D) 0.25 E) none of these

C) 2

A ride on a roller-coaster car containing 6 passengers takes 3 minutes. Neglecting friction, a similar ride with 12 passengers aboard would take A) 1.5 minutes. B) 6 minutes. C) 3 minutes. D) 18 minutes.

C) 3 minutes.

A 10-N falling object encounters 4 N of air resistance. The net force on the object is A) 0 N. B) 10 N. C) 6 N. D) 4 N. E) none of these.

C) 6 N.

A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension A) remains the same. B) decreases. C) increases.

C) increases.

When you relax at rest with your left foot one bathroom and your right foot on a similar scale, each of the scales will A) indicate different values that will equal your weight when added together. B) indicate exactly half your weight. C) indicate part of your total weight but not necessarily half of it. D) Any of the above may be correct.

C) indicate part of your total weight but not necessarily half of it.

A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is A) greater on the bug. B) greater on the car. C) the same for both.

C) the same for both.

An object maintains a constant acceleration unless there is a change in A) its mass. B) the air resistance. C) the applied force. D) any of the above

D) any of the above

An archer shoots an arrow. Consider the action force to be exerted by the bowstring against the arrow. The reaction to this force is the A) friction of the ground against the archer's feet. B) grip of the archer's hand on the bow. C) air resistance against the bow. D) arrow's push against the bowstring. E) combined weight of the arrow and bowstring.

D) arrow's push against the bowstring.

A feather and a coin will have equal accelerations when falling in a vacuum because A) the force of gravity is the same for each in a vacuum. B) their velocities are the same. C) the force of gravity does not act in a vacuum. D) the ratio of each object's weight to its mass is the same. E) none of these.

D) the ratio of each object's weight to its mass is the same.

A skydiver falls towards the Earth. The attraction of the Earth on the diver pulls the diver down. What is the reaction to this force? A) the attraction to the planets, stars, and every particle in the universe B) water resistance that will soon act upward on the diver C) air resistance the diver encounters while falling D) all of these E) none of these

E) none of these

The brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be A) 2 times as far. B) 1/2 as far. C) 4 times as far. D) 1 1/2 times as far. E) the same.

E) the same.