Practice Problems.pdf
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Practice Problems on speed, average speed, velocity and average velocity.
A force exerted over a distance to move an object is ______________________.
Anonymous Quiz
18%
Power
57%
Work
16%
Energy
9%
Momentum
A 5000N block is lifted 10 m. How much work was done?
Anonymous Quiz
59%
50000J
14%
5000J
23%
500J
5%
50J
In which of these cases is work being done?
Anonymous Quiz
9%
A student sleeps
21%
A student pushes a locked door that does not move
66%
A student carries his chair into another room
4%
A student sits on the carpet
Work done by the force of friction
Anonymous Quiz
13%
Can be positive
25%
Can be negative
13%
Can be zero
49%
All of the above
when a body slides against a rough horizontal surface, the work done by friction is
Anonymous Quiz
24%
Positive
13%
Zero
49%
Negative
13%
Constant
If a force acts perpedicular to the direction of motion of a body, what is the amount of work done?
Anonymous Quiz
3%
Infinity
25%
Constant
65%
Zero
6%
one
What is the sign of the work done by gravity on a man standing on a platform?
Anonymous Quiz
21%
Positive
32%
Zero
30%
Negative
17%
Depend on a particular situation
What is the sign of the work performed on an object in uniform circular motion?
Anonymous Quiz
44%
Zero
35%
Positive
10%
Negative
11%
Depend on the particular situation
❤4
A constant force of 10 N causes a box to move at a constant speed of 2 m/s. How much work is done in 10 seconds?
Anonymous Quiz
47%
200J
28%
100J
21%
20J
5%
25J
A horizontal force of 5 N is required to maintain a velocity of 2 m/s for a block of 10 kg
mass sliding over a rough surface. Calculate the work done by this force in one minute.
mass sliding over a rough surface. Calculate the work done by this force in one minute.
Anonymous Quiz
20%
20J
46%
10J
20%
5J
14%
25J
A force F = (5i – 3j +2k) N moves a particle from r1 = (2i + 7j + 4k) m to r2 = (5i + 2j + 8k) m. What is the work done by the force?
Anonymous Quiz
15%
18 J
15%
28 J
59%
38 J
11%
48 J
The area under the force (F) versus displacement (x) graph gives work.
Anonymous Quiz
71%
True
29%
False
A force F = x + 1 N acts on a particle in x direction. What is the work done from x = 2m to 5 m?
Anonymous Quiz
26%
9.5J
40%
8.3J
23%
12.6J
11%
13.5J
In situations involving non conservative external force, the work done by these forces:
Anonymous Quiz
43%
Can be either positive or negative
21%
Is always equal to zero
26%
Is always positive
9%
Is always negative
If Birr 5000 is invested at a rate of 6% compounded quarterly ( 4 times a year), then how long does it take to double the investment?
Anonymous Quiz
17%
4.5 years
48%
11. 58 years
24%
17. 42 years
10%
6. 62 years