What is the difference between velocity and speed?
Speed is just a number, while velocity is a number and a direction.
100
Can work be negative?
yes
100
If Grace were on the moon, would her weight change or her mass?
her weight
100
Can momentum be conserved?
yes
100
Define linear motion
Motion constrained to a single dimension
200
What is the SI unit for nano?
n
200
Don't look at your formula sheet! What is the equation for power?
Power=Work/Time
200
What is between the tires and the road that keeps the car under control?
Friction
200
Momentum is the product of ____ and ____
mass and velocity
200
define velocity
rate of displacement change
300
Distance is to displacement as speed is to....
velocity
300
Positive work increases the _____ of an object.
energy
300
What are the two types of friction?
kinetic and static
300
Brian throws Grace a ball and grace catches it. What type of collision is it?
Perfectly inelastic.
300
Define free fall
when the only force on a falling object is gravity (assume no air resistance)
400
What is the SI unit for micro?
µ
400
If Brian pushed on a solid wall with all of his strength for an hour and broke a sweat, then passed out, was any work done?
No
400
A semi truck and a smart car have a head- on collision. Which has the greater mass? Which has the greater damage? Which has the greater acceleration? and Which has the greater force on it?
Truck, smart car, smart car and equal.
400
What should you do to maximize the momentum of an object?
increase it's mass or velocity or both.
400
Define hang time
the total time spent in the air. Up time + down time
500
Charlie rolls a basketball down a ramp. If the ball's velocity increases from 3 m/s south to 24 m/s south in 7 seconds, then what is the acceleration?
3 m/s^2
500
Jenny pushes Chody on frictionless roller skates. Initially Chody is motionless and then is pushed 3 meters. Assume her mass is 55kg. How much work did Mike do?
1617 J
500
What is the unit for µ
There is no unit
500
the whole group must do 10 jumping jacks to get the 500 points.
:)
500
Define projectile
A moving object whose motion is only affected by gravity