A snow plow uncovered 100 miles of road in 4 hours . What was the average speed of the plow? (speed = distance divided by time)
25 mph
Forces that produce a nonzero net force, which changes an object's motion:
unbalanced force
A unit of measure for force is called:
Newtons
Jose Altuve is at batting practice for the Houston Astros. What was the average speed of the baseball for his third hit as it traveled in the air?
32 m/sec
A force that one surface exerts on another when the two surfaces rub against each other and causes objects to slow down or stop.
friction
A book falls off the desk. What moves the book towards the floor?
gravity
The average human can walk about 8 miles in 2 hours. What is the average speed?
4 mph
What two measurements are needed to calculate average speed?
distance and time
The tendency of an object to resist any change in its motion is:
inertia
A boy rides a skate board down a hill. Eventually the skate board stops. Which is most responsible for causing the skateboard to stop?
friction acting on the skateboard
Which best represents a unit for speed? Meters
m/sec
How does a wagons motion change when additional force is applied?
as forces increases, the wagon's mass changes
as force increases, acceleration decreases
as force increases, acceleration increases
as forces increases, the wagon direction changes
What is the formula for average speed?
Average Speed = Total Distance ÷ Total Time
Equal forces acting on an object in opposite directions; object will not move:
balanced force
What is an example of an unbalanced force?
a cat sitting on a chair
an alligator sleeping in the sun
a book laying on the desk
a boy jumping off his bike
How does the mass of an object affect acceleration?
the smaller the mass of an object the greater the force need
none of the above
The greater the mass of an object the smaller the force nee
The greater the mass of an object the greater the force nee