science
Grade-7
Easy
Question
The velocity-time graph of a uniformly accelerating body is a ____.
- Straight line parallel to the time-axis
- Straight line passing through the origin
- A curved line
- A curved line passing through the origin
Hint:
Slope of velocity-time graph shows acceleration.
The correct answer is: Straight line passing through the origin
In velocity-time graph, a straight line from origin represents that body started from rest is moving with increase in velocity with equal intervals of time. So, it can be said that a straight line from origin represents a uniformly accelerating body correctly.
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Look at the position-time graph below. What is the kind of motion shown by section no.1 of the graph?
Look at the position-time graph below. What is the kind of motion shown by section no.1 of the graph?
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What does the steepness of a position-time graph indicate?
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What is the correct relation between the acceleration of A and B?
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The ___ the velocity-time graph, the greater the ___ of a moving body.
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The position-time graph of a body at rest is a ___.
The position-time graph of a body at rest is a ___.
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The steepness of the position-time graph represents the ___.
The steepness of the position-time graph represents the ___.
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A ball is dropped from the top of the building reaches a speed of ___ m/s after 10 s.
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The value of acceleration due to gravity is ____ m/s2.
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The value 9.8ms-2 for acceleration due to gravity implies that for a freely falling body the velocity changes by 9.8ms-1 every second.
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Naas notes the speedometer readings of his friend’s car the moment he started applying brakes until the car stopped. Later, he calculated the acceleration of the car and found it out to be ___.
Negative acceleration is also known as deceleration.
Naas notes the speedometer readings of his friend’s car the moment he started applying brakes until the car stopped. Later, he calculated the acceleration of the car and found it out to be ___.
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Negative acceleration is also known as deceleration.
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Negative acceleration is also known as deceleration.
A car moving at a velocity of 76 m/s decreases its velocity uniformly to 6 m/s in 10 s. Work out its acceleration with a proper sign.
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Negative acceleration is also known as deceleration.
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A car moving at a velocity of 5 m/s increases its velocity uniformly to 50 m/s in 10 s. Work out its acceleration with a proper sign.
When there is a speeding of an object the the acceleration will be positive.
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When there is a speeding of an object the the acceleration will be positive.
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Which of the following is/are true about the attributes of a uniform circular motion?
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b. The speed changes throughout the motion of the body.
c. The acceleration being perpendicular to the velocity points towards the center.
Which of the following is/are true about the attributes of a uniform circular motion?
a. The velocity points in a tangential direction at every point of motion.
b. The speed changes throughout the motion of the body.
c. The acceleration being perpendicular to the velocity points towards the center.
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