Equations
A car drives 15 yards in 3 seconds. What is the average speed of the object?
5 yards per second
What is force?
When an object is acted upon by an unbalanced impact (push/pull)
What is inertia?
An object in motion stays in motion, until acted upon by an unbalanced force
What is speed?
The measurement of how fast or slow an object is
What is velocity?
The measurement of how fast or slow an object is including direction
A salmon can swim 168 miles in 120 hours. What is the speed?
1.4 mi/hr
What is the unit of force?
Newton
Who created the law of inertia?
Isaac Newton
What is the formula for speed?
speed=distance/time
A meteorologist describes a tropical storm as traveling Northwest at 50 mph. Which attribute of the storm's motion has the meteorologist described?
Velocity
At a track meet a runner's time is 14.6 seconds for the 100 meter dash. What is the speed?
6.8 s/m
What kind of force does it take for someone to push a grocery cart?
Applied force
What effect does inertia have on an object?
To resist any change in its state of motion (or something that is close enough to that)
A plane at an airshow flying by at 700 mi/hr is an example of
Speed
If two people push box and there are 67 Newtons of force applied from the left and there 21 Newtons of force applied from the right, how much force is applied and to which direction?
46 Newtons to the left
An airplane flies 900 miles in 1.5 hours. What is its average speed?
600 miles per hour
Force acts on an object may change
A. direction
B. speed
C. shape
D. all of the above
D
A cart of people is on the top part of a rollercoaster. When the cart falls, what is the force of impact causing the cart to fall?
Gravity
What is the speed?
Distance: 100 meters
Time: 20 seconds
5 meters per second
What is the velocity of a rocket that goes 700 km north in 25 seconds?
28 km north
An airplane travels 3,850 km in 5.5 hours. What is the speed of the airplane?
700 km/hr
Friction can be increased by
making rough surface (or something like that)
A book is lying on a table. If you suddenly pull the tablecloth from under it, what happens to the book?
The book stays in place
What is the speed?
Distance: 1899 meters
Time: 45 minutes
42.2
Which of the following are complete descriptions of the velocity of an object in motion?
1. A train travels west and 90 km/hr
2. A 7 kg ball rolls a distance of 20 m in 3 sec
3. A runner jogs 6 km/hr in 10 min
4. Mary drove north at 78mph
5. Birds fly 600 mh south for the winter
1 and 4