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
61%
Work
17%
Energy
5%
Momentum
A 5000N block is lifted 10 m. How much work was done?
Anonymous Quiz
58%
50000J
13%
5000J
23%
500J
6%
50J
In which of these cases is work being done?
Anonymous Quiz
9%
A student sleeps
16%
A student pushes a locked door that does not move
71%
A student carries his chair into another room
5%
A student sits on the carpet
Work done by the force of friction
Anonymous Quiz
12%
Can be positive
28%
Can be negative
12%
Can be zero
48%
All of the above
when a body slides against a rough horizontal surface, the work done by friction is
Anonymous Quiz
21%
Positive
12%
Zero
55%
Negative
12%
Constant
If a force acts perpedicular to the direction of motion of a body, what is the amount of work done?
Anonymous Quiz
4%
Infinity
20%
Constant
67%
Zero
8%
one
What is the sign of the work done by gravity on a man standing on a platform?
Anonymous Quiz
23%
Positive
32%
Zero
30%
Negative
15%
Depend on a particular situation
What is the sign of the work performed on an object in uniform circular motion?
Anonymous Quiz
49%
Zero
33%
Positive
6%
Negative
12%
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
46%
200J
29%
100J
20%
20J
6%
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
19%
20J
41%
10J
26%
5J
15%
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
20%
18 J
15%
28 J
55%
38 J
10%
48 J
The area under the force (F) versus displacement (x) graph gives work.
Anonymous Quiz
70%
True
30%
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
25%
9.5J
43%
8.3J
25%
12.6J
7%
13.5J
In situations involving non conservative external force, the work done by these forces:
Anonymous Quiz
42%
Can be either positive or negative
22%
Is always equal to zero
29%
Is always positive
7%
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
46%
11. 58 years
29%
17. 42 years
8%
6. 62 years