A student is riding the school bus. The bus stops as the driver applies the brakes. Which of these statements best describes this situation? (1 point)
A. The school bus does not lose or gain kinetic energy.
B. The bus is gaining energy because of friction.
C. There is no force acting on the bus so it stops moving.
D. A force is changing the motion of the bus.
5 answers
D. A force is changing the motion of the bus.
A pitcher throws a baseball to the catcher. The ball's path begins as a straight line, and then its patch curves toward the ground. Which two forces are acting on the baseball? (1 point)
A. electricity and friction
B. gravity and friction
C. inertia and magnetism
D. nuclear and inertia
A. electricity and friction
B. gravity and friction
C. inertia and magnetism
D. nuclear and inertia
B. gravity and friction
Two people are in a rowboat on a river. The current of the river water carries them at a speed of five meters per second even when they are not rowing. What will happen to the boat's motion of no other forces act on the boat?
(1 point)
A. The boat's speed will increase.
B. The boat's speed will decrease.
C. The boat's speed will stay the same.
D. The boat will change direction.
(1 point)
A. The boat's speed will increase.
B. The boat's speed will decrease.
C. The boat's speed will stay the same.
D. The boat will change direction.
C. The boat's speed will stay the same.
2 answers