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