Motion in a Straight Line

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Dear Student, Read question and answers

Smt. Induja (HSST)

VCSHSS, Puthenvelikara

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Q1. For a body in free fall, its acceleration at the highest point is....

Answer: g

Hint: Acceleration is acceleration due to gravity g only 


Q2. The velocity- time graph of a body in one dimensional motion is given. Which portion of the above graph represent uniform motion? 

Answer: BC

Hint: Along BC velocity remains constant


Q3. Area under the velocity time graph represents .....

Answer: Displacement





Q4. The speedometer of a car gives us ......

Answer: Instantaneous speed

Hint: Speedometer shows speed of the car at that instant we observe.



Q5. In which of the following graphs, relative velocity of A with respect to B is zero?

Answer: Graph (a)

Hint: Both are having same velocity, since slope of A = Slope of B 



Q6. Which of the following is TRUE ? (A) an object with constant velocity has always constant speed. (B) an object with zero velocity has always zero acceleration.

Answer: (A) only

Hint: In case of a stone thrown up vertically, at the highest point velocity is zero 
but acceleration a = g 

Q7. Which of the following is the graph of a body moving with constant acceleration?

Answer: All the above
Q8.

Answer: 3 second

Hint: The two graph lines meet at time , 3 second 

Q9.

Answer: 0 degree

Hint: Component of  r  along the x-axis is  r cosθ, when the when the angle θ = 0 then

r cosθ = r ( maximum value )


Q10. 

Answer: 60 m

Hint: Area under the speed-time graph gives distance traveled.
Here Area is a triangle

So,  Distance traveled = Area of triangle = 1/2 b h

Distance traveled = Area of triangle = 1/2 x 10 x 12 = 60 m

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