Kinematics
What is the difference between speed and velocity?
Answer: Velocity includes direction; speed does not
Which has more inertia: a large stationary truck or a fast-moving bicycle?
large stationary truck
Which has more momentum: a large stationary truck or a fast-moving bicycle?
Answer: The bike
What two variables determine kinetic energy?
Answer: Mass and velocity
In The Summer I Turned Pretty, what is the name of the beach house town where the family spends their summers?
Cousins Beach
Can an object have zero velocity and nonzero acceleration?
Answer: Yes, an example is a ball that is tossed in the air at the top of its path
Why don’t action–reaction forces cancel?
Answer: They act on different objects
Why do airbags reduce injury in a car crash in terms of impulse?
Answer: They increase the stopping time, which reduces the force for the same change in momentum
The units for energy
What are Joules?
What is the capital city of Canada?
Ottowa, Ontario
An object is dropped from rest and falls 45 m. How long does it fall?
Answer: t ≈ 3.0 s
Gravity, Normal, friction, push/applied from the student
A 0.15 kg baseball is thrown at 40 m/s. What is its momentum?
Answer: p = (0.15)(40) = 6.0 kg·m/s
What is the kinetic energy of a 2.0 kg object moving at 5.0 m/s?
Answer: KE = ½mv² = 25 J
What dystopian novel features the slogans “Big Brother is watching you” and “Thoughtcrime”?
1984 by George Orwell
A car accelerates at 2.0 m/s² for 5.0 s from rest. How far did the car travel in that time?
Answer: d = ½at² = 25 m
A 5.0 kg object accelerates at 2.0 m/s². Net force?
Answer: F = 10 N
Which applies more force, an object that sticks to you, or a similar object that bounces off of you?
Bounce
9 times
What year did Taylor Swift release her album 1989
2014
A ball is thrown upward at 20 m/s. How long does it take to return to the thrower?
4 seconds. 2 seconds up, and 2 seconds back down
Two skaters push off. Masses are 50 kg and 75 kg. Who accelerates more?
Answer: The 50 kg skater
A 1200 kg car moving at 20 m/s comes to rest in 0.50 s. What is the impulse on the car?
Answer: Δp = (1200)(0 − 20) = −24,000 kg·m/s (magnitude = 24,000 N·s)
The 'missing' matter and energy in the Universe that is difficult to detect
What is dark matter or dark energy
What U.S. Supreme Court case ended legal segregation in public schools?
Brown v. Board of Education