Physics Exam #1 (Chapters 1-4)

When you touch a cold piece of ice with your finger, energy flows A. from your finger to the ice B. from the ice to your finger C. actually both ways

A. from your finger to the ice

If a freely falling object were somehow equipped with a odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be A. less and less B. greater than the second before C. constant

B. greater than the second before

A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the A. force of the ball against the bat B. air resistance on the ball C. grip the player's hand against the ball D. weight of the ball E. none of these

A. force of the ball against the bat

Hang from a pair of gym rings and the upward support forces of the ring will always A. add up to equal your weight B. each be half of weight C. each be equal to your weight

A. add up to equal your weight

Earth satellites are typically more than 100km high so as to be above the Earth's A. atmosphere B. gravitational field C. both of these

A. atmosphere

A rock thrown upward at 50e with respect to the horizontal. As it rises, its vertical component of velocity A. decreases B. remains unchanged C. increases

A. decreases

State Newton's laws of motion and give examples

1. Law of inertia: every object in a state of motion will remain in that state of motion unless an external force acts on it 2. Law of force and acceleration: force equals mass times acceleration 3. Law of motion: for every action, there is a equal and opposite reaction

Distinguish between velocity and acceleration

Acceleration is increasing or decreasing speed or changing direction, whereas velocity is how much distance you cover in a given amount of time

For the astronauts inside the orbiting space shuttle, there is no force of Earth's gravity acting on them. This statement is A. sometimes true while in orbit B. always false C. always true while in orbit

B. always false

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

B. magnitude and direction

A kilogram is a measure of an objects: A. gravity B. mass C. force D. weight E. center of mass

B. mass

An object maintains its state of motion because it has A. weight B. mass C. acceleration D. speed E. all of these

B. mass

What does an object have when moving that it does not have when its at rest? A. energy B. momentum C. mass D. inertia E. none of these

B. momentum

Water pressure is greatest against the A. bottom of a submerged object B. sides of submerged object C. the same against all surfaces D. top of a submerged object D. none of these

B. sides of submerged object

Newton discovered A. gravity B. that gravity is universal C. neither

B. that gravity is universal

Compared with the mass of a certain object on Earth, the mass of the same object on the Moon is A. more B. the same C. less

B. the same

The lowest temperature possible in nature is A. 4K B. 0eC C. -273eC

C. -273eC???

The two measurements necessary for calculating average speed are A. distance and acceleration B. acceleration and time C. distance and time D. velocity and time E. velocity and distance

C. distance and time

If you push an object just as far while applying twice the force, you do A. the same amount of work B. four times as much work C. twice as much work

C. twice as much work

Which has zero acceleration? An object A) at rest. B) moving at constant velocity. C) in mechanical equilibrium. D) all of these E) none of these

D. All of these

A substance can absorb heat energy by the process of A. radiation B. convection C. conduction D. all of the above

D. all of the above

The force required to maintain an object at a constant velocity in free space is equal to A. the mass of the object B. the force required to stop it C. the weight of the object D. zero E. none of these

D. zero

Which of the following has the largest momentum relative to earth? A. a tightrope walker crossing Niagara Falls B. a dog running down the street C. the science building on campus D. a mack truck parked in a parking lot E. a pickup trail speeding along the highway

E. a pickup truck speeding along the highway

State the impulse-momentum relationship and give an example

The impulse momentum theorem states that the change in momentum of an object equals the impulse applied to it. Logically equivalent to Newton's second law of motion (force law) example: air bags in automobiles --> minimize effect of force on an object involved in a collision