Tag: what forces can do?

Questions Related to what forces can do?

If the the magnitude of the applied force changes while maintaining its direction, then choose the correct statement.

physics along with motion what forces can do? force and it's unit force and its effects

  1. Effect of force remain the same.

  2. Effect of force changes.

  3. Effect of force may or may not change.

  4. Insufficient information

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Correct Option: C

The application of a force would result in a change in the state of motion of an compressible object. The given statement is:

physics along with motion what forces can do? force and it's unit force and its effects

  1. always true.

  2. not always true.

  3. always false.

  4. insufficient information

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Correct Option: B
Explanation:

Many a times, application of force does not result in a change in the state of motion. For example, no effect of force in the state of motion is observed when you try to push a wall.

What is the direction of force of friction acting on a body moving on a fixed surface?

physics along with motion what forces can do? force and it's unit force and its effects

  1. Along the direction of motion

  2. Opposite to the direction of motion

  3. It has no direction

  4. At an angle to the direction of motion

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Correct Option: B
Explanation:

The force of friction acts on moving objects and its direction is opposite to the direction of motion.

When a force is applied on a non-rigid object,

physics along with motion what forces can do? force and it's unit force and its effects

  1. its shape changes

  2. its shape remains same

  3. only its state of motion changes

  4. nothing happens

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Correct Option: A
Explanation:

Force changes the shape of a non-rigid body.

Fill in the blank.

A rubber balloon _________ when the molecules of air exert force on its walls. 

physics along with motion what forces can do? force and it's unit force and its effects

  1. Expands

  2. Contracts

  3. No change in dimension is seen

  4. All of the above 

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Correct Option: A
Explanation:

Force can bring change in dimension.A rubber balloon expands when the molecules of air exert force on its walls.

Study the impact force when a golfer drives a golf ball $230$ meters down the fairway.

physics along with motion what forces can do? force and it's unit force and its effects

  1. The impact force on the golf ball is greatest

  2. The impact force on the club head is greatest

  3. The impact force is the same for both

  4. The impact force has no effect on the club

  5. The impact force has no effect on the ball

Show answer
Correct Option: C
Explanation:

The impact force or impulse is given by $I=F\times t$  

 by Newton's third law both will exert an equal and opposite force on each other and time of impact is also same therefore  impact force (impulse) is same for both.

An object is subjected to a non-zero net force, $F$. Which of the following statements about its motion could not be true?

physics along with motion what forces can do? force and it's unit force and its effects

  1. The object will remain at rest

  2. The object has a constant velocity

  3. The object is travelling in a straight-line path with a constant speed

  4. The object is travelling in a circular path with a constant speed

  5. The acceleration of the object is perpendicular to the net force

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Correct Option: A
Explanation:

Net force on an object is directly proportional to the acceleration of the particle which is the rate of change of velocity.

When a body moves in a uniform circular motion, its velocity keep on changing though its speed is constant.

The amateur boxers, use larger and more padded gloves than professional boxers. The amateur boxers are more protected from injury because:

physics along with motion what forces can do? force and it's unit force and its effects

  1. The larger glove exerts a larger impulse on the boxer

  2. The larger glove exerts a larger force on the boxer

  3. The larger glove exerts more energy on the boxer

  4. The larger glove increases time of impact on the boxer

  5. The larger glove increases the power exerted on the boxer

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Correct Option: D
Explanation:

We have impulse $\vec{I}=\vec{F}\times t=\vec{p} _{2}-\vec{p} _{1}$ 

when a boxer hits another boxer , change in momentum remains constant therefore product of force and time should be constant .we can decrease the force by increasing time of impact so boxer uses larger gloves to increase the time of impact  thus  decreases the force and avoids from injury.

Which of the statements about force are true?

physics along with motion what forces can do? force and it's unit force and its effects

  1. It can be seen

  2. It causes an object to move

  3. It is pull or a push

  4. It can change the motion of an object

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Correct Option: B,C,D
Explanation:

The force can net be seen but we can see the effects of the force. The force is a pull or a push. The effect of forces are like as it causes an object to move, it can change the motion of the body, it can change shape or volume of the body. 

State whether true or false.
When a body is travelling at a constant velocity, the net force on it is infinite.
physics along with motion what forces can do? force and it's unit force and its effects

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

If Body is travelling with constant velocity.

   $V=C$
   $a=0$
$F=0$ (newton second law)