Velocity Ratio

Q.

Which law of motion defines force?

Q.

Resistance to change in the state of motion is called __.

Q.

Which has more inertia, a rubber ball or metal ball of same size?

Q.

When the driver of a fast-moving car suddenly applies brakes, the passengers in the car:

1. fall backward

2. fall forward

3. are not affected

4. none of the above

Q. The rate at which the displacement of a body changes, is called velocity of the body.

1. True
2. False

Q.

Action-reaction forces:

1. act on the same body

2. act on different bodies

3. act along with different lines

4. act in the same direction

Q.

When a running motorbike accelerates suddenly the pillion rider tends to fall backward. This is an example of

1. Newton’s first law of motion

2. Newton’s second law of motion

3. Newton’s third law of motion

4. Newton’s law of gravitation of motion

Q. The rate at which the displacement of a body changes, is called velocity of the body.

1. True
2. False

Q. What should you do to reduce the amount of effort needed to lift something using a first class lever?

1. move the fulcrum closer to the effort
2. move the fulcrum closer to the load
3. none of the above
4. move the fulcrum to the middle of the lever

Q.

Velocity Ratio (V.R) = ( where the velocity of effort $V_E$ and the velocity of load $V_L$)

1. $V_E$: $V_L$

2. 2$V_E$: $V_L$

3. $V_L$: $V_E$

4. $V_E$: 2$V_L$

Q. The rate at which the displacement of a body changes, is called velocity of the body.

1. True
2. False

Q.

If a body is moving in a straight line at a constant velocity, then no forces are acting on the body.

1. True

2. False

Q. Newton's first law qualitatively describes inertia.

1. False
2. True

Q. A boy hits a football with some amount of action force. What can be inferred from this scenario?

1. The action and reaction forces differ in magnitude.
2. The action and reaction forces act only on the boy's foot.
3. There won't be any reaction force.
4. The reaction force acts on the boy's foot.

Q. Consider a porter standing on a platform with a suitcase which presses his head with a force of 200 N. If this force is taken to be action, then the reaction force is exerted by:

1. The earth on the suitcase.
2. The suitcase on the earth.
3. The earth on the porter.
4. The head on the suitcase.

Q.

If a body is moving in a straight line at a constant velocity, then no forces are acting on the body.

1. True

2. False

Q.

A force of 250 N produces a moment of force of 500 N m. Calculate the moment arm.

Q. The rate at which the displacement of a body changes, is called velocity of the body.

1. True
2. False