g. ... impossible to tell without knowledge of the F and a.
6. Calculate the momentum value of ... . (Include appropriate units on your answers.)
a. ... a 2.0-kg brick moving through the air at 12 m/s.
p = m•v = (2.0 kg)•(12 m/s) = 24 kg•m/s b. ... a 3.5-kg wagon moving along the sidewalk at 1.2 m/s.
p = m•v = (3.5 kg)•(1.2 m/s) = 4.2 kg•m/s 7. With what velocity must a 0.53-kg softball be moving to equal the momentum of a 0.31-kg baseball moving at 21 m/s?
psoftball = pbaseball
(0.53 kg)•vsoftball = (0.31 kg)•(21 m/s)
vsoftball = 12m/s Impulse and Momentum Change
8. Insert these words into the four blanks of the sentence: mass, momentum, acceleration, time, impact, weight, impulse, and force. (Not every word will be used.)
In a collision, an object experiences a(n) ____force____ acting for a certain amount of _____time_____ and which is known as a(n) __impulse__ ; it serves to change the __momentum__ of the object.
9. A(n) ___impulse___ causes and is equal to a change in momentum.
a. force b. impact c. impulse d. collision
10. Calculate the impulse experienced by .... . (Show appropriate units on your answer.)
a. ... a 65.8-kg halfback encountering a force of 1025 N for 0.350 seconds.
Impulse = F•t = (1025 N)•(0.350 s) = 359 N•s b. ... a 0.168-kg tennis ball encountering a force of 126 N that changes its velocity by 61.8 m/s.
Impulse = ∆momentum =m•∆v = (0.168 kg)•(61.8 m/s) = 10.4 kg•m/s = 10.4 N•s 11. Determine the impulse (I), momentum change (p), momentum (p) and other values.
A 7-ball collides with the 8-ball. A moving medicine ball is caught by a girl on ice skates.
A car is at rest when it experiences a forward propulsion force to set it in motion. It then experiences a second forward propulsion force to speed it up even more. Finally, it brakes to a stop.
A tennis ball is at rest when it experiences a forward force to set it in motion. It then strikes a wall where it encounters a force that slows it down and finally turns it around and sends it backwards.