Dimensional Analysis
10 kg in g
10000 g
Who thought that all things have a natural resting place?
Driving in a circle at 20 m/s represents changing...
Velocity
Define acceleration in your own words. What are the units
The change in velocity divided by the time. Units: distance/time^2
Given the amount of time in free fall, what equation would you use to calculate the distance fallen.
D=1/2(g)(t2)
20 min in hours
1/3 hour or .33 hours
This law states that things in motion will stay in motion unless a force acts upon them.
Newton's First Law
Driving 20 mph to the north represents a person's (speed or velocity)
What is the acceleration of an object going from 10 m/s to 50 m/s in 5 seconds?
8 m/s2
At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is:
60 m/s
4 m/s in m/min
240 m/min
The SI unit for mass? SI unit for weight
Mass: kilograms (kg)
Weight: Newtons (N)
Two measurements necessary for calculating average speed are:
Distance and time
What can you say about an object's velocity if it's acceleration is constant
Its velocity must be changing by the same amount each second.
A ball is thrown downward at a rate of 10 m/s. What is the speed after 4 seconds.
50 m/s
10 m/sec to km/hour
36
What is the weight of something that weighs 45 kg.
450 N
If you walk at an average speed of 4 m/s, in 8 seconds you will walk a distance of:
32 m
What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed of 20 m/s?
4 m/s2
Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, two seconds later the rock's speed is