Title: Summative Assessment
Course: MNPCC Physics > Section: Newton's Third Law

This quiz will tell you whether or not you learned what was needed in this unit.

Q: A 300 kg cannon on wheels fires a 20 kg cannon ball.  Which accelerates more?
- The cannon ball accelerates more. (Correct.)
- The accelerations are equal. (The forces are equal, but the masses are different.)
- The cannon accelerates more. (Acceleration is inversely proportional to mass. And force is the same.)
A: The cannon ball accelerates more.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: The cue ball strikes a the 8 ball.  The two balls have the same mass.  Which of the following is true.
- The cue ball will slow down more than the 8 ball speeds up. (They have the same mass.)
- The 8 ball will speed up more than the cue ball slows down. (They have the same mass.)
- The amount the cue ball slows down is equal to the amount the 8 ball speeds up. (Correct.)
A: The amount the cue ball slows down is equal to the amount the 8 ball speeds up.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: A child is pulling a wagon.  The force on the child and the force on the wagon are shown here.  In which direction will the child and wagon accelerate?

Image by openclipart / Public Domain
- Additional forces must be shared in order to answer this. (Correct)
- The two forces balance out so there will be no acceleration. (The forces can't cancel as they are on two different objects.)
- The box will accelerate forwards and the man will accelerate backwards. (They are attached and must have the same acceleration.)
A: Additional forces must be shared in order to answer this.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: A car runs into a wall.  How does the force of the car on the wall compare to the force of the wall on the car?
- The force from the car on the wall and the force from the wall on the car are equal. (Correct)
- The force of the car on the wall is greater than the force of the wall on the car. (They are equal.)
- The force of the car on the wall is less than the force of the wall on the car. (They are equal.)
A: The force from the car on the wall and the force from the wall on the car are equal.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which object will be harder to be brought to a stop.  A 10 kg ball moving at 10 m/s or a 100 kg ball moving at 0.5 m/s?
- It will be equally difficult to stop them both. (Their momenta are not equal.)
- The more massive ball will be more difficult to stop. (It has less momentum.)
- The faster moving ball will be more difficult to stop. (Correct.)
A: The faster moving ball will be more difficult to stop.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Two identical shuffleboard pucks are being pushed with the same force.  Puck A is being pushed for 1 second and Puck B is being pushed for 2 seconds.  Which puck will have the higher final speed?
- Puck B. (Correct)
- Puck A (Puck B has the force applied for more time.)
- The final speed will be identical. (Puck B has the force applied for more time.)
A: Puck B.
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Two eggs are dropped off of a balcony.  One lands on foam and stops in 0.1 seconds.  The other lands on a plate that is moved downward and brought to a stop over 1 second.  Which egg is less likely to break?
- The one caught on the plate. (Correct.)
- They are equally likely to break. (The time impacts the acceleration.)
- The one that is caught on the foam. (The opposite is true.)
A: The one caught on the plate.
If right: Your answer is correct.
If wrong: Your answer is incorrect.