1. Which of these expressions is the rate of change of momentum?
 A. Δp
 B. m/t
 C. Δm/t
 D. Δp/Δt


2. One of Newtons laws of motion states that the rate of change of momentum is equal to
 A. Acceleration
 B. Force
 C. Mass
 D. velocity


3. A firework rocket accelerates for the first few seconds and gains height above the ground. Which of the following best describes the energy changes taking place at this point?
 A. chemical and potential converted to kinetic
 B. kinetic converted to chemical and potential
 C. chemical converted to potential and kinetic
 D. potential converted to kinetic and chemical


4. The graph shows the force required to stretch a steel cable.
What work has been done stretching the cable by 12 cm?
 A. 240 J
 B. 120 J
 C. 2.4 J
 D. 1.2 J



5. Momentum is defined as ..
 A. the product of mass and velocity
 B. the force required to stop an 1kg object travelling at 1ms^{1 }
 C. the speed of an object multiplied by its mass in kg
 D. the rate of change of force


6. A small steel ball of mass m is fired at a solid wall at a speed v. It rebounds at a speed of v/2.
The total momentum change is
 A. 3mv/2
 B. mv/2
 C. 2mv
 D. 2mv/3


7. An inelastic collision is one in which..
 A. the final velocity is less than the impact velocity
 B. momentum is not conserved
 C. kinetic energy is not conserved
 D. the final average velocity is less than the initial average velocity


8. A 20g bullet hits a 40g stationary block of wood at 60ms^{1} and remains embedded in the wood. What is the final velocity of block and bullet?
 A. 40 ms^{1}
 B. 30 ms^{1}
 C. 25 ms^{1}
 D. 20 ms^{1}



