In class Practice Problems
In class Practice Problems
In class Practice Problems
- No tags were found...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Name______________________________________Block_____Date_________<br />
Ch 7 <strong>Practice</strong> <strong>Problems</strong><br />
∆p = m∆v ∆v=(vf - vo) J=F∆t F∆t = m∆v<br />
m 1o v 1o + m 2o v 2o = m 1f v 1f + m 2f v 2f<br />
m 1o v 1o + m 2o v 2o = (m 1 + m 2 ) v f<br />
(m 1 + m 2 ) v o = m 1f v 1f + m 2f v 2f<br />
1. a. What is the momentum of an 8kg bowling ball rolling at 2 m/ s<br />
b. if the bowling ball rolls into a pillow and stops in .5 s, calculate the average force it exerts<br />
on the pillow.<br />
c. What average force does the pillow exert on the ball
∆p = m∆v ∆v=(vf - vo) J=F∆t F∆t = m∆v<br />
m 1o v 1o + m 2o v 2o = m 1f v 1f + m 2f v 2f<br />
m 1o v 1o + m 2o v 2o = (m 1 + m 2 ) v f<br />
(m 1 + m 2 ) v o = m 1f v 1f + m 2f v 2f<br />
2. a. What is the momentum of a 50 kg carton that slides at 4 m/ s across an icy surface<br />
b. The sliding carton skids onto a rough surface and stops in 3 s. What is the change in<br />
momentum of the carton<br />
c. What was the impulse that changed the momentum of the carton, thus bringing it to a stop<br />
d. Calculate the force of friction the carton encountered in order to stop it in 3 s.
∆p = m∆v ∆v=(vf - vo) J=F∆t F∆t = m∆v<br />
m 1o v 1o + m 2o v 2o = m 1f v 1f + m 2f v 2f<br />
m 1o v 1o + m 2o v 2o = (m 1 + m 2 ) v f<br />
(m 1 + m 2 ) v o = m 1f v 1f + m 2f v 2f<br />
3. a. What impulse occurs when an average force of 10 N is exerted on a cart for 2.5 s<br />
b. What change in momentum does the cart undergo<br />
c. If the mass of the cart is 2 kg and the cart is initially at rest, calculate its final speed.
∆p = m∆v ∆v=(vf - vo) J=F∆t F∆t = m∆v<br />
m 1o v 1o + m 2o v 2o = m 1f v 1f + m 2f v 2f<br />
m 1o v 1o + m 2o v 2o = (m 1 + m 2 ) v f<br />
(m 1 + m 2 ) v o = m 1f v 1f + m 2f v 2f<br />
4. A 2 kg blob of putty moving at 3 m/ s slams into a 2 kg blob of putty at rest.<br />
Calculate the velocity of the two stuck-together blobs of putty immediately after colliding.
∆p = m∆v ∆v=(vf - vo) J=F∆t F∆t = m∆v<br />
m 1o v 1o + m 2o v 2o = m 1f v 1f + m 2f v 2f<br />
m 1o v 1o + m 2o v 2o = (m 1 + m 2 ) v f<br />
(m 1 + m 2 ) v o = m 1f v 1f + m 2f v 2f<br />
5. Dom is at Busch Gardens playing the arcade games. At one booth, he is throwing<br />
baseballs at stacked bottles trying to knock them over. He has one ball & one bottle left<br />
standing. He throws a .5 kg ball forward with a velocity of 21 m/ s and hits the 0.2 kg bottle.<br />
When the ball hits the bottle, the bottle moves forward with a velocity of 30 m/ s and falls<br />
off of the table. What is the velocity of the ball after it hits the bottle
∆p = m∆v ∆v=(vf - vo) J=F∆t F∆t = m∆v<br />
m 1o v 1o + m 2o v 2o = m 1f v 1f + m 2f v 2f<br />
m 1o v 1o + m 2o v 2o = (m 1 + m 2 ) v f<br />
(m 1 + m 2 ) v o = m 1f v 1f + m 2f v 2f<br />
6. Hayden rolls a 7 kg bowling ball down the alley trying to get a spare. One pin is still<br />
standing, and Hayden’s bowling ball hits the pin head-on with a velocity of 9 m/ s. The 2 kg<br />
pin acquires a forward velocity of 14 m/ s. What is the new velocity of the bowling ball
7. A 620 kg moose stands in the middle of the railroad tracks, frozen by the lights of an oncoming<br />
10,000 kg locomotive that is traveling at 10 m/ s. The engineer sees the moose but<br />
is unable to stop the train in time and the moose rides down the track sitting on the<br />
cowcatcher in the front of the locomotive (uninjured of course). What is the new combined<br />
velocity of the locomotive and the moose
∆p = m∆v ∆v=(vf - vo) J=F∆t F∆t = m∆v<br />
m 1o v 1o + m 2o v 2o = m 1f v 1f + m 2f v 2f<br />
m 1o v 1o + m 2o v 2o = (m 1 + m 2 ) v f<br />
(m 1 + m 2 ) v o = m 1f v 1f + m 2f v 2f<br />
8. Miles is sitting on a skateboard at rest. The combined mass of Miles and the skateboard<br />
is 60 kg. John throws a 10 kg medicine ball at Miles with a velocity of 3 m/ s. Miles catches<br />
the medicine ball which causes Miles and the skateboard to move. What will be the velocity<br />
of Miles & the medicine ball on the moving skateboard