EVERYDAY SCIENCE

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PHYSICAL SCIENCES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
An object moves at a constant speed.What will happen to this object’s motion over time if no new forces are applied?
A
It will change direction.
B
It will increase in speed.
C
It will decrease in speed.
D
It will maintain a constant speed.
Explanation: 

Detailed explanation-1: -Once in motion an object would continue in motion at constant speed and in the same direction unless acted upon by an unbalanced force.

Detailed explanation-2: -When an object moves with a constant speed there is no change in the value of acceleration hence the force remains constant.

Detailed explanation-3: -An object with no net forces acting on it which is initially at rest will remain at rest. If it is moving, it will continue to move in a straight line with constant velocity.

Detailed explanation-4: -Since the object is moving with a constant velocity, it means an acceleration of the body will be zero. So, the resultant / net force on the object will be zero.

Detailed explanation-5: -Acceleration is the change in velocity over a period of time. The object is going from v = 0 to some other speed or velocity. Likewise, if an object is already moving and a force is applied in the same direction, the object will speed up or accelerate.

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