Question

1. the momentum of an object depends upon the objects

a) mass and speed
c) size and shape
b) mass and energy
d) mass and velocity

1. which has more momentum: a car stopped at a red light or a bike moving at 15 mph?

a) they are equal
c) cannot determine using the info provided
b) bike
d) car

1. in any collision (crash) the ____ is always constant

a) energy
c) total momentum
b) total speed
d) total velocity

1. which of the following has the most momentum?

a) rolling soccer ball
c) rolling bowling ball
b) rolling basketball
d) rolling ping - pong ball

1. if an object has a mass of 20 kg and a velocity of 4 m/s, what is the momentum of the object?

a) 5 kgm/s
c) 4 kgm/s
b).2 kgm/s
d) 80 kgm/s

Explanation:

1. The formula for momentum is $p = mv$ where $p$ is momentum, $m$ is mass and $v$ is velocity. So momentum depends on mass and velocity.
2. A car stopped at a red - light has zero velocity, so its momentum is zero. A moving bike has non - zero momentum.
3. According to the law of conservation of momentum, in any collision, the total momentum is always constant.
4. Among a rolling soccer ball, rolling basketball, rolling bowling ball and rolling ping - pong ball, the bowling ball has the largest mass. Since they are all rolling (have non - zero velocity), the rolling bowling ball has the most momentum.
5. Using the momentum formula $p=mv$, with $m = 20$ kg and $v = 4$ m/s, we get $p=20\times4=80$ kgm/s.

Answer:

1. d) mass and velocity
2. b) bike
3. c) Total Momentum
4. c) rolling bowling ball
5. d) 80 kgm/s