Please can you help me to answer Yes or No/ False or True question here 1) If a

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Please can you help me to answer Yes or No/ False or True question here


1) If a particle moves along a curve with a constant speed, then its tangential component of acceleration is zero

2) The normal component of acceleration represents the time rate of change in the direction of the velocity

3) Work of the force exerted by a spring is positive when the spring is returning to its un-deformed position.

4) Friction is always negative
Forces which DO NOT do work
- A reaction at frictionless pin supporting rotating body
- Reaction at frictionless surface when a body is in contact moves along surface
- Weight of a body when it is centered.

5) The conservation of energy equation T1 +V1 = T2 +V2 can be applied if all of the forces that do work on the object are conservative.

6)A force that acts over a large interval of time but exerts a significant linear impulse is called an impulse force. FALSE, because these forces act for a very short time. Called impulsive forces. The product of the impulsive force and the time it acts is called the impulse. The impulse is equal to the change of momentum caused by the impulsive force.

7)The principle of impulse momentum is a vector equation that determines both the change of magnitude and direction of the velocity.

8) A coefficient of restitution of 1 means PERFECTLY ELASTIC.
9) A coefficient of restitution of 0 means PERFECTLY PLASTIC.

Explanation / Answer

1) If a particle moves along a curve with a constant speed, then its tangential component of acceleration is zero yes, since speed is constant ,the particle will not accelerate along the path.so,its tangential acceleration is zero. 2) The normal component of acceleration represents the time rate of change in the direction of the velocity yes, velocity is a vector it has both direction and magnitude. the tangential component represents change of speed with time.and the remaining tangential component represents the change of direction of velocity

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