Choose the correct option 1. When a bicycle travels on a rough surface, its speed will a) increase b) decrease remain the same d) none of these 2. Which of the following cannot happen when an object receives unbalanced forces? a) the object remains at rest b) it changes its speed c) it starts to move d) it changes direction 3. A force can cause a) change in weight of a body b) change in mass of body c) change in inertia of a body d) none of these 4. Which of the following activities would not be possible in the absence of friction? a) holding a glass b) writing on paper c) sitting on a chair d) all of these
Answers
Answer:
1) ------------------------------------------------------------------(b)
2) -----------------------------------------------------------------(a)
3) -----------------------------------------------------------------(c)
4) -----------------------------------------------------------------(b)
Explanation:
1) Speed will decrease due to frictional force
2) In the case of unbalanced force sum of resultant forces != 0,so object can't remain in rest...
3) According to Newton's 3rd law an object can mentain it's inertia property during the absense of any type of external force,but if we apply force it can't mentain the inertia...
4) If there is no friction then we can't write because in the time of writting our pen will be slipped from our hand...
Answer:
Ans a-decrease is the correct answer