science
Grade-7
Easy
Question
The ___ the velocity-time graph, the greater the ___ of a moving body.
- Straighter, velocity
- Sharper, displacement
- Steeper, acceleration
- Sharper, acceleration
Hint:
The slope of the velocity-time graph shows the acceleration of the body.
The correct answer is: Steeper, acceleration
The Steeper the velocity-time graph, the greater the Acceleration of a moving body.
More the angle of the slope, more the acceleration.
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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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In a position-time graph, the ___ of an object is plotted against ___.
In a position-time graph, the ___ of an object is plotted against ___.
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A body moving at 2 m/s uniformly increases its velocity by 5 m/s every second. Its velocity after 30 s becomes ___ m/s.
A body moving at 2 m/s uniformly increases its velocity by 5 m/s every second. Its velocity after 30 s becomes ___ m/s.
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A ball is dropped from the top of the building reaches a speed of ___ m/s after 10 s.
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.
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.
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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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.
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.
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.
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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?
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.
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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Pick the odd one out.
Acceleration is rate of change of velocity.
Pick the odd one out.
scienceGrade-7
Acceleration is rate of change of velocity.
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Match the following and choose the option with all the right matches:
| i |
Positive acceleration |
a |
Slowing down |
| ii |
Negative acceleration |
b |
Uniform motion |
| iii |
Zero acceleration |
c |
The motion of a running athlete |
| iv |
Non-uniform acceleration |
d |
Speeding up |
Acceleration is a vector quantity
Match the following and choose the option with all the right matches:
| i |
Positive acceleration |
a |
Slowing down |
| ii |
Negative acceleration |
b |
Uniform motion |
| iii |
Zero acceleration |
c |
The motion of a running athlete |
| iv |
Non-uniform acceleration |
d |
Speeding up |
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Acceleration is a vector quantity
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A train starts from rest and picks up a velocity of 15 m/s in 3 s. The acceleration of the train is ___ m/s2.
A train starts from rest and picks up a velocity of 15 m/s in 3 s. The acceleration of the train is ___ m/s2.
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Which of the following constantly changes during a uniform circular motion?
When an object completes one round then the displacement will be zero.
Which of the following constantly changes during a uniform circular motion?
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When an object completes one round then the displacement will be zero.
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Sam wants to modify the formula for acceleration
I.e., a = (v – u)/ t
Where v = final velocity, u = initial velocity, t= time, a = acceleration, to suit the special case of freefall of a ball dropped from the top of a building. He chooses to make the following substitutions in the formula.
a. v= 0
b. u= 0
c. a= 9.8 m/s2
Identify the correct substitutions.
Acceleration of gravity is 9.8ms-2
Sam wants to modify the formula for acceleration
I.e., a = (v – u)/ t
Where v = final velocity, u = initial velocity, t= time, a = acceleration, to suit the special case of freefall of a ball dropped from the top of a building. He chooses to make the following substitutions in the formula.
a. v= 0
b. u= 0
c. a= 9.8 m/s2
Identify the correct substitutions.
scienceGrade-7
Acceleration of gravity is 9.8ms-2
