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Physic 2
| Question | Answer |
|---|---|
| Galileo's Law of Inertia is the same as | Newton's First Law |
| In the absence of an external force, a moving object will | move with constant velocity in a straight line |
| Suppose several forces are acting upon a mass m. the F in F=ma refers to | the vector sum of all the forces |
| If you push a 4kg mass with the same force that you push a 10 kg mass from rest then | the 4 kg mass accelerates 2.5 times faster than the 10 kg mass |
| A 20 ton truck collides with a 1500 lb car and causes a lot of damage to the car | the force collision on the truck is equal to the force of collision on the car |
| An arrow is shot straight up. At the top of its path, the net force acting on it is | equal to its weight |
| Two to cars are released simultaneously on an inclined plane that makes an angle of 30 degrees with the horizontal. Which statement best describes their acceleration after being released? | Both cars accelerate at a rate of gsin(30) |
| An object is dropped from a helicopter. When it reaches terminal velocity | the total force is zero |
| To push a piece of heavy furniture across the carpet usually takes more force to get it moving than it takes to keep it moving. This is because | the static coefficient of friction is larger than the kinetic coefficient |
| If you blow up a balloon and then release it the balloon will fly away as the air rushes out of it. This is an illustration of | Newton's Third Law |
| The are under the curve on a force position graph represents | work |
| If you push twice as hard against a stationary brick wall the amount of work you do | remains constant at 0 |
| work done by static friction is always | zero |
| you throw a ball straight up. compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down | up - down + |
| If the net work is done on an object is positive then the objects kinetic energy | increases |
| if both the mass and the velocity of a ball are tripled the kinetic energy is increased by a factor of | 27 |
| king kong falls from the top of the empire state building, through the air (air friction present) to the ground below. How does his kinetic energy just before striking the ground compare to his potential energy at the top of the building | K is less than U |
| compared to yesterday you did 3 times the work in 1/3 the time. to do so your power output must have been | 9 times yesterdays power output |
| Which graph illustrates hookes law? | graph b (line from 0 diagonally out) |
| Is it possible for a system to have negative potential energy | yes since the choice of the 0 of potential energy is arbitrary |
| the magnitude of his momentum will be a maximum at which point. | D (bottom of the fall) |
| Suppose a bug spatters upon your windshield as you drive down the road. which sustains the greater change of momentum | both the same |
| automobile air bags reduce what during a collision | the average force exerted upon the passenger |
| a car hits another and the two bumpers lock together during the collision. is this this inelastic or elastic | inelastic |
| a 100 kg football linebacker moving a 2m/s tackles head on an 80 kg halfback running 3 m/s. neglecting the effects due to the digging of the cleats | the halfback will drive the linebacker backward |
| the are under the curve on a F-t graph represents | impulse |
| two cars suffer a head-on collision and stick. what is conserved in the collision | momentum |
| when a cannon fires a cannonball, the cannon will recoil backwards because the | momentum of the cannonball and cannon is conserved |
| the impulse delivered to an object is equal to the change in the objects velocity | false |
| the center of mass of an object must always be located where the physical material of the object is located | false |
Created by:
sarapoehlman