Question

In: Physics

Indicate whether the following statements are always true or can be false. (Select T-True, F-False. If...

Indicate whether the following statements are always true or can be false. (Select T-True, F-False. If the first is F and the rest T, enter FTTTTT).

A) In order not to slow down, a bicycle moving at a constant velocity needs a small net force applied.

B) If two objects have the same acceleration, they are under the influence of equal forces.

C) If a net force acts on an object, the object's velocity will change.

D) During the collision of a car with a large truck, the car exerts a lesser force on the truck than the truck exerts on the car.

E) The net force which acts on an object which maintains a constant velocity is zero.

F) If a net force acts on an object, the object's speed will change.

Solutions

Expert Solution

A)FALSE

If the bicycle is moving with constant velocity, net force on the bicycle is zero. Hence if the same forces continue to act on the bicycle it will continue to move with constant velocity.Hence no extra forces are necessary.

B) FALSE

From Newton's second law,

Accelerations of the objects are same, but their masses need not be same.So they are not under the infuence of equal forces.

C)TRUE

From Newton's first law, if a net force acts on an object it will not be in a state of equilibrium, hence its velocity will change.

D) FALSE

By Newton's third law, the objects apply forces of equal magnitude and opposite direction on each other.

So the on collision, the car and the truck exert equal forces of equal magnitude on each other.

E)TRUE

If the body is moving with constant velocity, it is in a state of equilibrium. That is the net force acting on the object is zero.

F) FALSE

Net force changes the velocity of the object. which means change in magnitude or change in direction, only when magnitude changes we can say that speed changes. There are cases where net force acting on the object is not zero but its speed remains constant.(uniform circular motion)

genius_generous answered 2 years ago
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