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Worksheetswork and power
Total questions: 12
Worksheet time: 36mins
布朗以50 N的力拉动一箱子水平移动 5 m, 已知该力与移动方向呈 60° ，求布朗对箱子做的功。
Brown pulls a box with a force of 50 N to move it horizontally for 5 m. It is known that this force is 60° in the direction of movement, determine the work done on the box by Brown.
W = (a) J
一汽车正以 30 m s−1 匀速行驶，输出功率为 60kW 。汽车所受的摩擦力 = _______ N
A car is driving with constant speed of 30 m s−1 , output power as 60kW . The frictional force exerted on the car is _______ N
(a)
可尼用 10 s 爬上二楼，做了 3000 J 的功。可尼的平均功率 = ________ W
Cony use 10 s to climb up to second floor, a work of 3000 J is done. The average power of Cony is ________ W
(a)
一汽车匀速行驶100 m，汽车牵引力为 3000 N，问摩擦力做的功是多少？
A car drives with constant speed for 100 m, the driving force is 3000 N, how much work is done by frictional force?
300 000 J
-300 000 J
0J
根据图象，求变力做的功。
based on the graph, determine the work done by the variable force.
40 J
80 J
2.5 J
1.25 J
50 kg 的布朗以 0.5 m s−1 的速度移动。他的动能是 _____ J
50 kg Brown moves with 0.5 m s−1 velocity. His kinetic energy is _______ J
(a)
40 kg Cony climbs up to a height of 10 m. take g =10 m s−2 , her gravitational potential energy is _____ J
40 kg 可尼爬上 10 m 高，取 g =10 m s−2 ，她的重力势能是 ______ J
(a)
2 kg 的物体在 10 m 处掉落，问重力做功多少？
2 kg object falls from 10 m, how much work is done by gravity?
200 J
-200 J
0 J
Compress a spring of 3000 N m−1 for 2 cm. Elastic potential energy stored is _______ J
将劲度系数为 3000 N m−1 的弹簧压缩 2 cm. 其弹性势能为 ________ J
(a)
2 kg 小球从P点去到R点，求小球在R点的动能。
A 2 kg ball moves from P to R, determine the kinetic energy of the ball at R.
0 J
4 J
16 J
36 J
一苹果从 3.2 m 处掉落，
苹果落地的速率为 _______ m s−1
[g=10 m s−2]
An apple falls from 3.2 m, the speed of the apple falling on ground is _____ m s−1
(a)
一 1000 kg 的汽车以 20 m s−1 行驶，在 2000 N 摩擦力的作用下，滑动了 ______ m 后将会停下。
A car with mass of 1000 kg moves with 20 m s−1 , under 2000 N, it moves for ______ m before it came to stop.
(a)
