# GED Science Extra Prep: Forces and Their Effects

Some questions on the GED Science exam will test your knowledge of the laws of physics. The following practice questions focus on Newton’s law of motion.

## Practice Questions

*Use the following information for both questions.*

A student is testing out Newton’s laws of motion by applying different forces for 3 seconds to different-colored toy cars of the same mass (2 kg each). The cars start at rest. She records the data for the toy cars in the following chart.

- What is the value of the unbalanced force acting on the green car?
**A.**0 N

**B.**4 N

**C.**6 N

**D.**10 N - Which car has the greatest unbalanced force acting on it?
**A.**red

**B.**orange

**C.**green

**D.**blue

## Answers and Explanations

- The correct answer is A.
You can calculate the unbalanced force acting on each car by multiplying the mass by the acceleration (using

*F*=*ma*). The green car has zero acceleration; therefore, the value of the unbalanced forces acting on it must be zero. The correct answer is Choice (A). - The correct answer is A.
You can calculate the unbalanced force acting on each car by multiplying the mass by the acceleration (using

*F*=*ma*). Because all the cars have the same mass, the car with the largest acceleration must have been subjected to the largest unbalanced force, making Choice (A) the correct answer.