WorksheetsPOT Semester 2 Final Exam Review Quizizz 1
Total questions: 26
Worksheet time: 1hrs 5mins
What kind(s) of energy is(are) in a person climbing a ladder?
Potential
Kinetic
Both
Need the mass of the person to determine.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy?
The PE and KE increase and decrease together
The PE decreases while the KE increases
Impossible to know without knowing the mass
The PE and the KE decrease and increase together.
According to the Law of Conservation of energy, the amount of energy before and after a reaction must be the same. Which statement below is true?
The total amount of energy is conserved
The total amount of energy is less after a reaction
The total amount of energy is more after a reaction
Need the mass of the object to determine if energy is conserved.
When velocity triples, kinetic energy increases by ______ times. KE =1/2mv2
9
3
1.5
4.5
A cliff diver with a mass of 125 kg jumps off a 50m high cliff, how fast will he be traveling just before he hits the water? (His height at this point is 0m)
(HINT: Find PE first. then KE = 1/2mv2
g = 9.8 m/s2
61,250 m/s
980 m/s
31.3 m/s
247.5 m/s
What is the kinetic energy at position Y? (ignore friction)
0J
10,000J
20,000J
can not be determined
Select the best equation that would help solve the problem:
Ball A and Ball B have the same mass. Ball A rolls and collides with Ball B at rest. Ball A rolls with some velocity after the collision, what is the velocity of Ball B?
Δp = mv
p = mv
(before) mAvA + mBvB = mAvA + mBvB (after)
(before) mAvA + mBvB = (mA + mB)v (after)
A 3,000 kg truck moving at +10 m/s hits a 1,000 kg parked car which moves off at +15 m/s after the collision. What is the velocity of the truck after the collision?
10 m/s
0 m/s
5 m/s
2 m/s
A 10,000 kg railroad car traveling at a velocity of 6 m/s hits a stationary (at rest) boxcar that weighs 5600 kg. At what speed will the second boxcar move if the railroad car reduces its speed to 4.0 m/s after collision?
Assume that all railroad car and the boxcar move in the same direction after the collision.
5.0 m/s
3.6 m/s
7.8 m/s
9.8 m/s
A 2.5 kg ball moving at 5 m/s collides with another 2.5 kg ball that is at rest in a perfectly elastic collision. What is the total momentum of these two balls before collision?
25 kg m/s
12.5 kgm/s
50 kgm/s
6.25 kgm/s
An external force _____ the total momentum of a closed system
changes
does not change
An internal force _____ the total momentum of a closed system
Changes
does not change
Energy cannot be created or destroyed.
True
False
The Law of Conservation of Energy states that the total energy of a system is always conserved. Is this statement:
TRUE
FALSE
If an object is dropped from a certain height, does the total energy of that object keep decreasing until it becomes zero once it strikes the ground?
TRUE
FALSE
The law of conservation of energy states that energy can neither be destroyed nor created. According to this law which of these equations is correct?
E=mc2
KE = PE
Energy in = energy out
Energy in = power in
A quarterback throws a Hail Mary to try and win a game. As the ball travels, what is happening to the total energy in the ball+Earth system? (Disregard friction and air resistance)
The total energy quickly reaches zero
The total energy is decreasing
The total energy isn't changing
The total energy is increasing
