FREE HESI Physics Questions and Answers

Question 1

A student observes that increasing the mass of an object increases the force needed to move it. What scientific law best explains this?

Accepted Answer

Newton's Second Law

Answer

Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F=ma). Therefore, if the mass (m) of an object increases, a greater force (F) is required to produce the same acceleration (a), explaining why more force is needed to move a heavier object.

Question 2

A ball is thrown straight up. What is the direction of its acceleration at the top of its path?

Accepted Answer

Downward

Answer

At the very top of its path, when a ball is thrown straight up, its instantaneous vertical velocity is zero, but it is still under the influence of gravity. The force of gravity continuously pulls the ball downward, resulting in a constant downward acceleration (approximately 9.8 m/s² on Earth), which causes it to fall back down.

Question 3

Why does a metal spoon feel colder than a wooden spoon at the same room temperature?

Accepted Answer

Metal is a better conductor of heat

Answer

Metal feels colder than wood at the same room temperature because metal is a much better thermal conductor. When you touch the metal spoon, heat rapidly transfers from your warmer hand to the colder metal, causing your hand to lose heat quickly and perceive the metal as cold, whereas wood, being an insulator, transfers heat much slower.

Question 4

If you double the velocity of an object, what happens to its kinetic energy?

Accepted Answer

It quadruples

Answer

Kinetic energy (KE) is calculated using the formula KE = 0.5 * m * v², where m is mass and v is velocity. If you double the velocity (2v), the new kinetic energy becomes 0.5 * m * (2v)² = 0.5 * m * 4v² = 4 * (0.5 * m * v²). Therefore, doubling the velocity quadruples the kinetic energy.

Question 5

Which situation best demonstrates the law of conservation of momentum?

Accepted Answer

Two skaters push off each other and roll away

Answer

The law of conservation of momentum states that in a closed system, the total momentum remains constant. When two skaters push off each other, they exert equal and opposite forces (Newton's Third Law), resulting in equal and opposite changes in their individual momenta, but the total momentum of the two-skater system before and after the push remains conserved.

HESI (ATI) Practice Test

HESI (ATI) Practice Test

FREE HESI Physics Questions and Answers