Problemas
Askateboarder runs a few steps and then jumps on his skateboard His initial applied energy carries him across a level surface for about 30 seco skater notices that he has skated a long time without ever having to push off the ground again. What allows the skateboarder to move so long without pushing? Gravity does not act on the skater and the skateboard. There is very little friction between the wheels of the skateboard and the surface. Momentum increases as the length of time increases. The texture of the skating surface is very rough. Multiple Choice 2 points
Roztwór
José
élite · Tutor durante 8 años
4
(312 Votos)
Respuesta
The correct answer is B. The skateboarder can move for a long time without having to push off the ground again because there is very little friction between the wheels of the skateboard and the surface.
Explicación
## Step 1The problem is asking us to identify the reason why a skateboarder can move for a long time without having to push off the ground again. The options provided are:A. Gravity does not act on the skater and the skateboard.B. There is very little friction between the wheels of the skateboard and the surface.C. Momentum increases as the length of time increases.D. The texture of the skating surface is very rough.## Step 2We need to evaluate each option based on the principles of physics.## Step 3Option A is incorrect because gravity does act on the skater and the skateboard. The skateboarder is able to stay on the skateboard due to the force of gravity.## Step 4Option B is correct. The skateboarder can move for a long time without having to push off the ground again because there is very little friction between the wheels of the skateboard and the surface. This means that the skateboarder doesn't need to push off the ground as often to keep moving.## Step 5Option C is incorrect because momentum does not increase with time. Momentum is the product of mass and velocity, and it doesn't increase just because time has passed.## Step 6Option D is incorrect because a rough texture would increase friction, not decrease it. This would make it harder for the skateboarder to move, not easier.