Work Energy Problems review for test
1. How much work is required
to push a 5 kg object with a force of 40 n horizontally for a distance of 3 m?
Data Principle Formula Solution Answer
120 J
2. Same problem as above with
the force applied at an angle of 30 degrees with respect to the force. Draw a figure!
Data Principle Formula Solution Answer
104J
3. How much work is required
to raise the 5 kg object 3m vertically?
Data Principle Formula Solution Answer
147J
4. How much work is required
to push the 5 kg object up a frictionless plane that is at 30 degrees with the
horizontal if the final vertical height obtained is 3m?
Data Principle Formula Solution Answer
147J
5.
A 3 kg hammer moving 10 m/s hits a nail and drives it 2 cm. What was the force on the nail?
Principle: Formula Work Answer
Data
7500N
6.
How fast will a 5 kg rocket be traveling if its motor has a force of 2000 n and
it operates for 500 m?
Principle: Formula Work Answer
Data
632
m/s
7. A ball is thrown straight
into the air with a velocity of 30 m/s.
How high does it rise?
Principle: Formula Work Answer
Data 45.9
m
8. A boy falls off a 2 m high
pier into a lake. How fast is he moving
when he hits the water? Principle: Formula Work Answer
Data 6.23 m/s
9. A 30 kg girl falls head
first off a 1.5 m ladder and her head makes an impression in the ground that is
5 cm deep. What was the average force of
the ground on her head?
Principle: Formula Work Answer
Data 8820 n
10. A 1 kg weight falls 2 m
and hits a stick with a force of 1000 N.
How far will the stick be driven into the ground?
Principle: Formula Work Answer
Data 2 cm
11. A 1000 kg truck traveling
20 m/s hit a parked car with a force of 20,000 N. How far does it push the car?
Principle: Formula Work Answer
Data 10 m
12. A 1000 kg car rolls down a 10 m high hill
without friction starting from a stop.
How fast is it traveling at the bottom of the hill?
Principle Data Formula Solution Answer
14
m/s
13. How much work is required
to raise a 10 kg object 30 m? Give the
Total Energy, the Potential energy and the Kinetic Energy at that point. (At rest 30 m above the ground)
Data Formula Solution Answer
Work _______ (2940 J)
Total Energy: _______(2940
J)
When the 10 kg object has
fallen 10 m, give the potential energy, the kinetic energy, and the total
energy of the object.
Data Formula Solution Answer
P.E _______1960J
K.E. _______980 J
Total Energy: _______(2940
J)
Give the total energy, the
potential energy, and the kinetic energy of the object just before it strikes
the ground. (It is at ground level still moving full speed.)
Data Formula Solution Answer
P.E _______(0)
K.E. _______(2940
J)
Total Energy: _______(2940
J)
14. What is the amount of
heat energy released when the 10 kg object hits the ground?
Data Formula Solution Answer
_______(2940
J)