Legend

 p = momentum m = mass v = velocity Fav = average force t = time Vi = initial velocity Vf = final velocity

Problems

 Before you start the Problems, be sure to have a pen/pencil and paper for working out the problems, and also a calculator.  If you want to use our java calculator:

1) A puck sliding on a frictionless surface undergoes a change in momentum due to a constant force.  Which of the following expressions could be used to determine the change in momentum?
a) F
d
b) F
t
c) F
v
d) F(
v/t)

2) Two carts collide while travelling on a smooth surface.  The sum of the kinetic energies is the same before as after.  This collision must be:
a) elastic
b) inelastic
c) between carts of identical mass
d) between carts of that stick together

3) A 0.15 kg ball moving at 40 m/s is struck by a bat.   The bat reverses the ball's direction and gives it a speed of 50 m/s.  What average force does the bat apply to the ball if they are in contact for 6.0 X 10-3 s?

 103 N

4) In order to stop two sliding objects the greater impulse must be given to the one having greater:
a) mass
b) speed
c) velocity
d) Ns

5) An object sliding to the right breaks into two pieces.   The momentum of fragment 1 after the explosion is 23 kgm/s. Find  P2.

 kgm/s

6) Which set of conditions is true for all inelastic collisions?

 momentum kinetic energy total energy a) conserved conserved conserved b) conserved not conserved conserved c) not conserved not conserved conserved d) not conserved conserved not conserved

7) A 2.0 kg puck travelling due east at 2.5 m/s collides with a 1.0 kg puck travelling due south at 3.0 m/s.  The stick together on impact.  What is the resultant direction of the combined pucks?

 ?S of E

8) A 0.15 kg ball rolls off an edge at 2.4 m/s as shown.  What is the vertical component of the ball's momentum when it strikes the floor 0.85 m below?

 kgm/s
 RESULTS

 Formulas Equilibrium