Problem 1
What notion must be called when a body is said to be at rest or in motion?
Problem 2
The positions of a moving body can be recorded at equal time intervals, and the photo in which all the recorded positions are superimposed is called a stroboscopic photo.
a) Analyze strobe image 1 and highlight the type
of movement that the child describes with the scooter.
b) Follow in figure 2 the movement of a ball that was launched with a certain speed near the horizontal surface of a room and identify the portions of the path traveled by the ball in which the movement is accelerated and slowed down, respectively.
Problem 3
What shape does the trajectory of the axis of a bicycle wheel have with respect to an earth-related reference system, as the bicycle moves? But relative to a frame of reference related to the pedaling cyclist, what shape does the trajectory of the axis take?
Problem 4
A train leaves one station at 8:20 and arrives at the next station at 9:10. If the distance traveled is 120 kilometers, what is the average speed of the train in its movement between the two stations?
Problem 5
A hiker travels a path like this: the first half of the total time is moving straight and uniform at a speed of 4 m/s, and the rest of the time is also moving straight and uniformly at a speed of 2 m/s. Calculate the hiker's average speed for the entire journey, choosing the correct answer.
Problem 6
A passenger sitting in a tram moving at a speed vt = 10 km/h observes two pedestrians moving in opposite directions, on roads parallel to the tram track. Pedestrians move rectilinearly and uniformly with equal speeds vp = 2 km/h. Calculate the speed of each pedestrian recorded by the tram passenger.
Problem 7
An escalator climbs straight and uniformly at a speed of 2 m/s between two floors. The length of the staircase between the two floors is 4 meters. Find the time interval in which a man at rest on the ladder will climb between the two floors. If the man rushes up the escalator at a speed of 1 m/s, how long does it take him to reach the top floor, given that the escalator is going up at a speed of 2 m/s?
Problem 8
Below is the variation table of the movement of a student leaving school and arriving home. In the table, x is the student's home coordinate. The movement of the pupil is known to be rectilinear. It graphs the student's movement, identifies the type of movement and calculates the average speed with which it moved.
Time (min) 0 1 2 3 4 5 6 7 8 9 10
Coord. x (m) 0 90 180 270 360 450 540 630 720 810 900
Problem 9
The figure below shows the motion graphs of three people. What can you say about each person's movement? What type of movement does each have? Find the speeds at which each of the three people is moving.
16 янв 2024
