Question

Q 1:

Which could potentially cause you the greater injury;beingtackled by a light-weight,

fast-moving football player, or being tackled by a playerwithdouble the mass but

moving at half the speed?

Q 2:

For each situation, state whether the collision is elasticorinelastic. If it is inelastic, state

whether it is completely inelastic or not?

a) You drop a ball from your hand. It collides with thefloorand bounces back up so

that it just reaches your hand.

b) You drop a different ball from your hand and let itcollidewith the ground. This

ball bounces back up to half the height from which itwasdropped.

c) You drop a ball of clay from your hand. When itcollideswith the ground, it stops.

Q 3:

Will the centre of mass in continue on the sameparabolictrajectory even after one

of the fragments hits the ground? Why or why not

Q 4:

(a)If a rocket in gravity- free outer space has the samethrustat all times, is its

acceleration constant, increasing or decreasing?

(b) If the rocket has the same acceleration at all times,isthe thrust constant, increasing or

decreasing?