Share PS.7.1.1-Force and Motion Review Questions
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What two measurements are needed to calculate average speed?
distance and time
What is the formula for average speed?
Average Speed = Total Distance ÷ Total Time
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
Which best represents a unit for speed? Meters
m/sec
The average human can walk about 8 miles in 2 hours. What is the average speed?
4 mph
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 unit of measure for force is called:
Newtons
Forces that produce a nonzero net force, which changes an object's motion:
unbalanced force
Equal forces acting on an object in opposite directions; object will not move:
balanced force
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
A book falls off the desk. What moves the book towards the floor?
gravity
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
How does the mass of an object affect acceleration?
none of the above
the smaller the mass of an object the greater the force need
The greater the mass of an object the smaller the force nee
The greater the mass of an object the greater the force nee
What is an example of an unbalanced force?
a boy jumping off his bike
a cat sitting on a chair
an alligator sleeping in the sun
a book laying on the desk
How does a wagons motion change when additional force is applied?
as force increases, acceleration increases
as forces increases, the wagon direction changes
as forces increases, the wagon's mass changes
as force increases, acceleration decreases
