Describing Motion and Force
A girl pushes on the classroom door and opens it. Which two terms accurately describe the net force acting on the door?
Contact and unbalanced
You can find the speed on a distance-versus-time graph by finding the _________ of the line.
slope
Which term describes resistance to change in motion?
inertia
When is there static friction between your desk chair and the floor?
when the chair sits still
A dog is pulling on a leash while walking down the sidewalk. What could you use as a reference to indicate the dog is NOT moving?
the leash
A cross-country runner runs 4 km in 15 minutes. What can you calculate using this information?
speed
A soccer player kicks a ball. Which of the following describes the reaction force to this kick?
force applied to the foot by the ball
Why would a large potted plant be harder to move across the floor after watering it?
Two dogs pull on a rope. One dog pulls with a force of 5 N to the left, and the other dog pulls with a force of 3 N to the right. What is the result?
The rope moves to the left
Which statement about acceleration is always true?
Either a change in speed or a change in direction causes acceleration.
Which of Newton's Laws of Motion talks about action and reaction forces?
Newton's Third Law of Motion
Assume the following measurements were taken on Earth. Which measurement can be used to measure MASS?
kg
What two factors must you include to determine the VELOCITY of an object?
Speed and Direction
The acceleration of a baseball after it is hit by a bat depends on the mass of the ball and the net force of a ball. This example best illustrates what law?
Newton's Second Law of Motion
Assume the following measurements are taken on Earth. Which two measurements can be used to label WEIGHT on Earth?
lbs and N
A bus driver drives from Chicago to Indianapolis. He drove the first 100 km in 2 hours, the next 55 km in 1 hour, and the final 75 km in 2 hours. What is the average speed of the bus through the trip?
46 km/h