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Physics Test 1

QuestionAnswer
The language of science is mathematics
Somebody who says, "that's only a theory" likely doesn't know that a scientific theory is a vast synthesis of well-tested hypotheses and facts
The force needed to keep a ball rolling along a bowling alley is not due to gravity, not an inertial force, not a slight breeze
The equilibrium rule, F = 0 applies to objects at rest and moving at a constant velocity
If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in a straight line
The average speed of a gazelle traveling a distance of 2 km in a time of one-half hour is 4 km/h
An object in free fall undergoes an increase in speed
If a falling object gains 10 m/s each second it falls, its acceleration is 10 m/s per second
An object with a huge mass must also have a huge weight
Why the acceleration of free fall is the same for all masses is explained by Newton's second law
The amount of air drag on an 0.8 N flying squirrel dropping vertically at terminal velocity is 0.8 N
When a cannonball is fired from a cannon, both the cannonball and the cannon experience equal amounts of force
The team that wins in tug-of-war is the team that pushes hardest on the ground
An airplane with its nose pointing north with an airspeed of 40 km/h in a 30 km/h crosswind (at right angles) has a groundspeed of 50 km/h
The impulse-momentum relationship is a direct result of Newton's second law
A big fish swims upon and swallows a small fish at rest. Right after lunch, the fattened big fish has a change in speed
The work done on a 100-kg crate that is hoisted 2 m in a time of 4 s is 2000 J
The power required to raise a 100 kg crate a vertical distance of 2 m in a time of 4 s is 500 W
A model car with 3 times as much speed as another has a kinetic energy that is none of these (the same, twice, or 3 times)
Lift a 100 N crate with an ideal pulley system by pulling a rope downward with 25 N of force. For every 1-m length of rope pulled down, the crate rises 25 cm
When 100 J are put into a device that puts out 40 J of useful work, the efficiency of the device is 40 %
A machine cannot multiply energy
When a tin can is whirled in a horizontal circle, the net force on the can acts inward
A torque is a force multiplied by a lever arm
The rotational inertial of an object is grater when most of the mass is located away from the axis
If the Sun were twice as massive, its pull on Mars would be away from the axis
The highest ocean tides occur when the Earth and Moon are lined up with the Sun
The component of velocity that can remain constant for a tossed baseball is horizontal
THe magnitude of gravitational force on a satellite is constant if the orbit is circular
A satellite in Earth orbit is above Earth's atmosphere
Created by: 822952714493209
 

 



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