Units
What's the SI unit for speed?
meter/second
Which is generally longer, distance or displacement?
Distance
A cyclist travels 60 meters in 2 seconds.
30 m/s
What is the equation for Newton's 2nd law?
F=ma
As an object is falling, what happens to the gravitational potential energy and kinetic energy? (Which one increases, which one decreases?)
How many mg are in 0.8g?
(1 milli= 0.001)
800mg
You drive north on the interstate for 10 miles then realize your missed your exit, turn around and drive 6 miles south. What is your distance?
16 miles
p=mv
A car at a light accelerates from rest to 18m/s to 3s. What's your acceleration?
9 m/s2
What is centripetal acceleration?
It is acceleration that is directed toward the center of a circle/curve
What is the Newton equivalent to?
You walk north for 40 meters then walk south for 15 meters. What is your displacement?
25 meters
250 kg * m/s
You are pushing a couch across the floor with a force of 16N to the right. There is a frictional force of 10N. What is the net force? (magnitude and direction)
Net force= 6N to the right
What are the equations for kinetic energy and gravitational potential energy?
KE= 1/2 m*v2
GPE= mgh
What the equivalent of a Joule?
1 Joule= kg *m2/s2
A sprinter runs on a 400m track 5 times. What is your distance and displacement?
Dist: 2,000m
Disp: 0m
If you are traveling at a velocity of 15 m/s, what distance will you cover (in meters) in 4s?
60m
A dog is running with a speed of 16m/s then slows to a walk at a speed of 4m/s in 3s. What is its acceleration?
What is the kinetic energy of an object with a mass of 6kg and a velocity of 5m/s?
75 J
Convert a density of 6kg/L to g/mL.
6g/mL
A bus drives north one block, west one block, then south one block, then east 4 blocks. If each block is 300m, what is the displacement?
900m
If a ball has a momentum of 24 kg*m/s and a speed of 6m/s, what is its mass (in kg)?
4kg
A roller skater with a mass of 60kg is skating with a net force of 120N, what is the acceleration?
2 m/s2
Explain what terminal velocity is.
When an object is in freefall, the air resistance increases until it balances with the force of gravity (which is constant). When those two forces balance out, there is no acceleration. At that point, the velocity becomes constant--this is the terminal velocity.