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Physics Test 2
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Gravity
Terms in this set (30)
Galileo's law of inertia is the same as
Newton's first law
You are standing in a moving bus, and you suddenly fall backward. You can imply from this that the bus's
velocity increased
Suppose several forces are acting upon a mass m. The F in F=ma refers to
any particular one of the forces
If you push a 4-kg mass with the same force that you push a 10-kg mass from rest, the
the 4-kg mass accelerates 2.5 times faster than the 10-kg mass
An arrow is shot straight up. At the top of its path, the net force acting on it is
equal to its weight
Planning to elope with her boyfriend, Janice slides down a rope from her fourth story window. As she slides down the rope, she tightens harder on the rope which of course increases the tension on the rope. When the upward tension in the rope equals Janice's weight
Janice will continue down at a constant speed
If the two identical masses are attached by a light cord passing over a massless, frictionless pulley of an Atwood's machine but at different heights, and then released, then
the masses will not move
You fall while skiing and one ski (of weight W) loosens and slides down an icy slope (assume no friction), which makes an angle θ with the horizontal. The force that pushes it down along the hill is
W sin theta
Two cardboard boxes full of books are in contact with each other on a frictionless table. Box H has twice the mass of box G. If you push on box G with a horizontal force F, then box H will experience a net force of
3/2 F
An object is dropped from a helicopter. When it reaches terminal velocity
the total force is 0.
Which of the following is not a unit of work
N-m^2
A toolbox, of mass M, is resting on a flat board. One end of the board is lifted up until the toolbox just starts to slide. The angle θ that the board makes with the horizontal for this to occur depends on the
coefficient of static friction
Can work be done on a system if there is no motion
No, since work involves a non-zero displacement.
Work done by static friction is always
zero
On a plot of F vs x, what represents the work done by force F
the area under the curve
The work energy theorem says
the net work done plus the initial kinetic energy is the final kinetic energy
A truck weighs twice as much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the car?
the truck has 8 times the K of the car
Is it possible for a system to have negative potential energy?
Yes, since the choice of the zero of potential energy is arbitrary
A leaf falls from a tree, Compare its kinetic energy K to its potential energy U
K increases, U decreases
The total mechanical energy of a system
is constant, only if conservative forces act.
A 4-kg mass moving with speed 2 m/s and a 2-kg mass moving with a speed of 4 m/s, are gliding over a horizontal frictionless surface. Both objects encounter the same horizontal force, which directly opposes their motion, and are brought to rest by it. Which statement correctly describes the situation
the 2-kg mass travels twice as far as the 4-kg mass before stopping
To accelerate your car at a constant acceleration, the car's engine must
maintain a constant power output
A Ping-Pong ball moving east at a speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?
Neither, Both experienced the same magnitude impulse
Two cars suffer a head-on collision. What is conserved in the collision?
Kinetic energy
Two equal mass balls (one blue and the other gold) are dropped from the same height, and rebound off the floor. The blue ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?
the blue ball
A car hits another and the two bumpers lock together during the collision. Is this an elastic or inelastic collision?
inelastic
A car of mass M, traveling with a velocity V, strikes a parked station wagon, whose mass is 2M. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in the collison
2/3
A golf ball traveling 3 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the gold ball immediately after the collision is
equal to 3 m/s
A proton, of mass m and speed v, strikes an alpha-particle (Which consists of 2 protons and 2 neutrons) at rest. If the collision is completely elastic, what speed will the alpha particle have after the collision?
2/5 v
Two cars collide head-on on a level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?
It was always zero.
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