Force and Effects of Force
Important Questions on Force and Effects of Force
The given figures show the forces required to move a object over different surfaces. The friction is greatest at
A boy set up an experiment as shown in the diagram. As he slides the magnet across the wooden board, the ball bearing followed the magnet's movement and direction. What does the experiment show?
(i) Magnetic force can be seen due to friction between ball bearing and wooden board.
(ii) Friction and gravity help to move the ball bearing.
(iii) The ball bearing is made of a magnetic substance.
(iv) Magnetic force can pass through the wooden board.
Does a falling body accelerate? Why?
Jay and Puneet go to the amusement park to play the pin ball game. The figure shows the extent to which each of them pulls the striker. Which one of the following statements is correct?
In the given diagram, when a weight of is hung from the spring, its length is . When a weight of is hung from it, its length is . What is the length of the spring when there is no weight hanging from it?
A wooden block is floating in water contained in a beaker. If the beaker is placed in a freely falling elevator, during the free fall, the upthrust on the block will be
The diagram shows an object hanging from a string. Which of the following is the correct statement about the diagram?
Match the column I with column II and select the correct option from the codes given below.
| Column I | Column II | ||
| (a) | A girl pulling the leash of a running dog | (i) | Impact of force can make stationary object to move |
| (b) | A driver turning the steering wheel of a car | (ii) | Gravity acts upon an object |
| (c) | When you hit a nail with a hammer | (iii) | Force can make an object go slower |
| (d) | A ball released from the top of a tower | (iv) | Force can change the direction of a moving object |
Which of the following statements are true?
(i) An object will continue moving uniformly until the resultant force on it is zero.
(ii) The bodies do not change their state of rest or motion unless acted upon by an unbalanced external force.
(iii) If a body is at rest on the surface of the Earth then the net downward force exerted by the Earth and net upward force exerted on the body are not equal to each other.
