Difficulty: Medium

Average Score: 67%

In which scenario is gravity the force that causes the object's change in motion?

Rationale

A ball falling from a shelf to the floor.

In this scenario, gravity is the primary force acting on the ball, causing it to accelerate downward towards the Earth. This motion exemplifies how gravity influences an object's trajectory when it is in free fall.

A (A person running from one end of a room to the other) YOUR ANSWER

In this case, the person's change in motion is driven by the force generated by their muscles, propelling them forward. Gravity does act on the person, but it does not directly cause the change in motion; rather, it is the result of applied force through running.

B (A ball rolling to a stop on the floor) YOUR ANSWER

The ball's deceleration is primarily due to friction between the ball and the surface of the floor, which opposes its motion. Although gravity keeps the ball on the ground, it is not the force causing the change in motion in this scenario.

C (A bicycle turning when the rider moves the handlebars) YOUR ANSWER

The turning motion of the bicycle is influenced by the rider's steering input, which alters the direction of the bike. While gravity affects the bicycle's stability and traction, it is not the force responsible for the change in motion during the turn.

D (A ball falling from a shelf to the floor) CORRECT

In this scenario, gravity is the dominant force causing the ball to accelerate downward. This demonstrates gravity's role as the primary influence on motion when an object is dropped and is in free fall.

Conclusion

Gravity serves as a fundamental force that influences the motion of objects, particularly in scenarios involving free fall. Among the provided options, the case of a ball falling from a shelf clearly illustrates gravity as the primary force affecting motion, while the other scenarios involve different forces such as friction or applied force. Understanding gravity's role is crucial in physics, especially regarding motion and acceleration.

Related Questions

View all