Formalities
What are the units of acceleration?
m/s2
A ball is pushed from rest and rolls until it stops. Is it accelerating? WHY
Yes! It changes velocity!
v=10 m/s north, t=2 seconds, a=?
a=5 m/s2
3
What words mean something is (1) speeding up and (2) slowing down
Accelerating and decelerating
A car travels on a strait highway with cruise control on 65 miles per hour. Is it accelerating? WHY
No! It is at a constant velocity (speed and direction)
v=15m/s south, t=40 seconds, a=?
a=0.375 m/s2
What is the chemical formula for water?
H2O
What is the formula for acceleration?
a=v/t
A car slows down at a red light. Is it accelerating? WHY
yes! its velocity changes (speed changes)
An object has an average velocity of 50 m/s over 100 seconds. What is the average acceleration?
a=0.5 m/s2
What is the average temperature of the human body?
98.6 F
Can acceleration be 0 if something is moving?
Yes, as long as the velocity is 0 (not speeding up/ slowing down or changing directions)
A person rides a merry go round at a constant speed of 5 rotations per minute. Are they accelerating? WHY
Yes (their velocity changes, specifically the direction)
How do you calculate change in velocity? (delta v)
delta v=vf - vi
How many M&M colors are there in a standard bag?
6 (red, orange, yellow, green, blue, brown)
Say an example of something accelerating (make up a situation)
varies...
Malik throws a basketball in a hoop and it goes in and bounces off the ground. Is it accelerating? WHY
Yes! (it changes velocity- speed and direction)
A car is driving with an initial velocity of 35 meters per second and speeds up to 40 meters per second in 10 seconds. What is the average acceleration of the car?
a=1 m/s2
What is the deadliest animal in the world?
the mosquito!