If a bicyclist travels 30 kilometers in two hours, her average speed is
What is 15 km/h
100
When you know both the speed and direction of an object’s motion, you know the
What is velocity of the object.
100
Which of these is an example of deceleration?
a. bird taking off for flight
b. a roller coaster moving down a steep hill
c. a car approaching a red light
d. an airplane following a straight flight path
What is a car approaching a red light
100
In physical science, a push or a pull is called a(n)
What is a force
100
In a graph of distance versus time, the slope represents
What is the speed
200
The rise of a line on a distance-versus-time graph is 400 km and the run is 50 hours. What is the speed of the object represented by this graph?
What is 8 km/h
200
Average speed is...
What is the total distance traveled divided by the total time.
200
Changing direction is an example of a kind of...
What is acceleration
200
What happens when two forces act in the same direction?
What is they add together!
200
The law of universal gravitation states that any two objects in the universe, without exception,
What is attract each other
300
A car travels 85 km in the first hour of a trip. The car continues to travel for 2 more hours and travels 200 km. What was the average speed of the car for the trip?
What is 95 km/h
300
If the speed of an object does NOT change, the object is traveling at a
What is constant speed
300
A runner rounding a curve on a track at a constant speed is an example of what type of acceleration?
What is changing direction
300
Balanced forces acting on an object
What is never change the object's motion
300
According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail
What is exerts an equal force back on the hammer
400
How does the momentum of a 4.0-kg bowling ball rolling at 3.0 m/s compare to the momentum of a 6.0-kg bowling ball rolling at 2.0 m/s?
What is the bowling balls have equal momentum.
400
If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true?
What is the object's velocity did not change.
400
What kind of line on a distance-versus-time graph indicates that the object is accelerating?
What is a curved line.
400
Which of the following is true of the buoyant force?
What is it acts in the upward direction
400
According to the law of conservation of momentum, when two objects collide in the absence of friction,
What is momentum is not lost
500
If speed is measured in meters per second and time is measured in second, the unit of acceleration is
What is meters/second/second or meters/second squared
500
The rate at which velocity changes is called...
What is acceleration
500
A place or object used for comparison to determine if something is in motion is called
What is a reference point
500
Objects falling through air experience a type of friction called