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Unit 5
Test Description: Energy, Work, Power
Instructions: Answer all questions to get your test result.
1) Work is....
A
the area of a force vs time graph
B
the area of a force vs distance graph
C
the slope of a force vs distance graph
D
the slope of a force vs time graph
2) A 2000 kg car is going 2m/s. How much power is required to bring it to a stop in 4 seconds?
A
32000 W
B
16000 W
C
1000 W
D
500 W
3) In which case is work being done?
A
a bowling ball rolls down a slick alley
B
you are sitting at your desk doing your homework
C
you climb up a set of stairs
D
you carry your books across the room
4) A projectile is launched at some angle between 1 and 89 degrees, Which is true?
A
At the apex, all the KE has converted to PE
B
Elastic potential energy increases
C
The total ME at the apex is the same as it was just after it was launched
D
Gravity does work on it to change the ME
5) A skier starts from rest at the top of a 20 m tall hill. How fast will he be going at the bottom of the hill?
A
40.0 m/s
B
10.2 m/s
C
can't solve without mass
D
19.8 m/s
6) Energy is not...
A
a scalar
B
the ability to do work
C
conserved
D
a vector
7) Power is measured in...
A
respect
B
Newtons
C
Joules
D
Watts
8) Which is false about work?
A
it has direction
B
it can be negative
C
W = fdcos(θ)
D
Work is measured in Joules
9) a 8kg block is pulled 7 m along a frictionless horizontal surface by a rope that makes an angle of 35 deg with the horizontal. If the tension on the rope is 60N then how fast is it traveling at the end of the 7 m if it started from rest?
A
9.3 m/s
B
37.1 m/s
C
7.7 m/s
D
41.8 m/s
10) a bullet has 340 J of KE when it strikes a target. If it penetrates .4m then what is the force applied to the bullet?
A
136N
B
272N
C
850N
D
1700N
*select an answer for all questions
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