Force and Motion-related Phenomena：練習問題

When a car moves on a road, a force is generated between the tires and the road surface that opposes the motion. According to the syllabus, what is the name of this resistance force, and in what direction does it act relative to the movement of the car?

A student pushes hard against a heavy stone wall with a force of \( 50 \) N. Although the wall does not move, the student feels the wall pushing back against their hands with the same amount of force. Which principle of force does this demonstrate?

When a ball rolls across a carpet, it eventually slows down and stops. What is the direction of the friction force acting on the ball as it moves?

When a force acts on a stationary toy car and causes it to start moving, which of the following is the most likely change that occurs to the toy car's position, according to the study material?

Imagine you push a toy car across the floor, and it eventually stops. Identify the main force that causes the car to slow down and stop, and describe its direction relative to the car's motion.

When a car driver steps on the brakes, the car slows down and eventually stops. Explain how friction helps to stop the car and describe the direction of this frictional force relative to the car's motion.

A student is conducting an experiment with a toy car on a flat floor. Based on the syllabus for 'Force and Motion-related Phenomena', answer the following questions:

a) When the student uses their hand to push the stationary toy car, what is the primary effect of this force on the car's state of motion?
b) After the car is moving, the student stops pushing it. The car eventually slows down and stops. What is the name of the resistance force that acts between the car's wheels and the floor to cause this?
c) In which direction does the force mentioned in part (b) act relative to the movement of the toy car?

A ball is released from a height and then rolls across a flat floor before stopping.

(a) Name the force that pulls the ball downward toward the ground when it is released. (1 point)

(b) As the ball rolls on the floor, it eventually stops. Identify the force responsible for this and state its direction relative to the ball's motion. (2 points)

(c) If the ball is rolled on a rougher surface, will it travel a longer or shorter distance? Why? (1 point)