1. A train engine pulls the boxcars. What are the horizontal forces present?(1 point) A. push of engine, friction

B. weight, friction

C. pull of engine, friction

D. pull of engine, weight

2. A train pulls the boxcars. What are the vertical forces present?(1 point)

A. weight, push of tracks against wheels

B. weight, pull of air on boxcars

C. pull of air on boxcars, push of tracks against wheels

D. weight, friction

3. The force of gravity on the Moon is 1.6 m/s2 and on Mars it is 3.7 m/s2. How does the weight of an astronaut on the Moon compare to that of an astronaut on Earth or Mars?(1 point)

A. The astronaut weighs the most on the Moon and the least on Mars.

B. The astronaut weighs the most on Earth and the least on Mars.

C. The astronaut weighs the most on Mars and the least on the Earth.

D. The astronaut weighs the most on Earth and the least on the Moon.

4. In the free-body diagram, the net force is 800 N. What is the magnitude of the downward force?
A.800 N

B.200 N

C.600 N

D.1,000 N

5. In the free-body diagram, what is the net force?

A.10 N, right

B.32 N, right

C.80 N

D.40 N, right
6. A group of students conduct an experiment to study Newton’s second law of motion. They applied a force to a toy car and measure its acceleration. The table shows the results.

If the students graph the data points, which conclusion will they be able to make?

A. The data points will fall along a line. This shows that as the force increases, the acceleration increases.

B. The data points will not fall along a line. This shows that as the force increases, the acceleration decreases.

C. The data points will not fall along a line. This shows that as the force increases, the acceleration increases.

D. The data points will fall along a line. This shows that as the force increases, the acceleration decreases.