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WorksheetsWork & Energy
Total questions: 16
Worksheet time: 32mins
A person carries a 2.50-N pebble through the path shown in the figure, starting at point A and ending at point B. The total time from A to B is 405s. How much work did gravity do on the rock between A and B?
45 J
-45 J
37.5 J
-37.5 J
A person carries a 2.50-N pebble through the path shown in the figure, starting at point A and ending at point B. The total time from A to B is 405s. How much work did the person do on the rock between A and B?
45 J
-45 J
37.5 J
-37.5 J
Linda does four times as much work as James does and in one-third the time. Linda’s power output is ________.
four times James’ power output
the same as James’ power output
twelve times James’ power output
cannot be determined
Work is ____.
a scalar
a vector
neither a scalar nor vector
both a scalar and vector
What is the kinetic energy of a 50 N boulder resting at the top of a 25 m cliff?
1250 J
625 J
0 J
12500 J
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. If there is no air resistance, when they hit the ground _______.
the heavier one will have half the kinetic energy of the lighter one
the heavier one will have twice the kinetic energy of the lighter one
the heavier one will have one-fourth the kinetic energy of the lighter one
the heavier one will have four times the kinetic energy of the lighter one
Three cars (car A, car B, and car C) are moving with the same speed when the drivers slam on their brakes. The most massive car is car A, and the least massive is car C. If the tires of all three cars have identical coefficients of kinetic friction with the road surface, for which car is the amount of work done by friction in stopping it the greatest?
The amount of work done by friction is the same for all cars.
Car A
Car B
Car C
The graph plots velocity against time. During which interval is no work done?
Between A & B
Between B & C
Between C & D
Between D & E
The graph plots velocity against time. What feature of the graph shows negative work?
Velocity increases
Velocity remains constant
Velocity decreases
Cannot be determined
Constant velocity implies
a = 0 m/s2
Fnet = 0 N
Balanced forces
W = 0 J
All of the above
A closed system ____.
conserves mechanical energy
conserves potential energy
conserves kinetic energy
does not conserve energy
Energy transferred out of a system is typically transferred via ____.
tension force
friction force
spring force
gravitational force
Which is not a type of potential energy?
Chemical energy
Gravitational energy
Elastic energy
Thermal energy
Which quantity is not integral for calculating mechanical energy?
force
height
mass
velocity
acceleration
A ball is tossed straight up and later returns to the point from which it was launched. If the ball is subject to air resistance as well as gravity, which of the following statements is correct?
The speed at which the ball returns to the point of launch is less than its speed when it was initially launched.
The time for the ball to fall is the same as the time for the ball to rise.
The force of air resistance is directed down-ward both when the ball is rising and when it is falling.
The net work done by air resistance on the ball during its flight is zero.
The net work done by gravity on the ball during its flight is greater than zero.
An amusement park ride has two identical carriages that revolve around the center of the ride’s axle, as shown in the figure. Both carts travel at a constant tangential speed at all points along the circular path. At what position is the total mechanical energy of the cart-cart-Earth system at its maximum value?
The total energy of the Earth-ferris wheel ride is constant
