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Questions and Answers
What is the primary reason a force must be applied to change the direction of velocity?
What is the primary reason a force must be applied to change the direction of velocity?
- To apply a force in the opposite direction
- To change the magnitude of velocity
- To maintain the circular path
- Because velocity cannot change by itself (correct)
What is the direction of the force required to move a body in a circular path?
What is the direction of the force required to move a body in a circular path?
- Parallel to the velocity
- At an angle of 45 degrees to the velocity
- Opposite to the velocity
- Perpendicular to the velocity (correct)
What is the purpose of the centripetal force?
What is the purpose of the centripetal force?
- To increase the speed of the body
- To decrease the speed of the body
- To move the body in a circular path with uniform speed (correct)
- To change the direction of the force
What is the direction of the centripetal force?
What is the direction of the centripetal force?
Why must the force act along the radius?
Why must the force act along the radius?
What is the primary reason why observer B cannot relate the event to inertia?
What is the primary reason why observer B cannot relate the event to inertia?
What happens to the body when the centripetal force ceases to act on it?
What happens to the body when the centripetal force ceases to act on it?
What is the name given to the imaginary force that appears to act on the body from the perspective of observer B?
What is the name given to the imaginary force that appears to act on the body from the perspective of observer B?
In the problem described, what happens to the tension in the string when the speed of the ball is increased from 10 r.p.m. to 20 r.p.m.?
In the problem described, what happens to the tension in the string when the speed of the ball is increased from 10 r.p.m. to 20 r.p.m.?
What is the relationship between the tension in the string and the angular velocity of the ball?
What is the relationship between the tension in the string and the angular velocity of the ball?
Who experiences the centrifugal force?
Who experiences the centrifugal force?
What is the work done by centripetal force?
What is the work done by centripetal force?
Why does an electron in a hydrogen atom not absorb or emit energy when revolving around the nucleus?
Why does an electron in a hydrogen atom not absorb or emit energy when revolving around the nucleus?
What is the condition for a satellite to revolve around the earth without requiring fuel?
What is the condition for a satellite to revolve around the earth without requiring fuel?
What is the centripetal force acting on a particle doing uniform circular motion in a horizontal plane?
What is the centripetal force acting on a particle doing uniform circular motion in a horizontal plane?
What is the velocity of the projectile at the highest point of its parabola?
What is the velocity of the projectile at the highest point of its parabola?
What is the horizontal velocity of the projectile when it is projected at an angle of 30° to the horizontal?
What is the horizontal velocity of the projectile when it is projected at an angle of 30° to the horizontal?
What is the time of flight of the projectile if it is fired at 30° to the horizontal and has a vertical component of velocity of 80 ms^(-1) at the highest point?
What is the time of flight of the projectile if it is fired at 30° to the horizontal and has a vertical component of velocity of 80 ms^(-1) at the highest point?
What is the horizontal range of the projectile if it is fired at 30° to the horizontal with an initial velocity of 160 ms^(-1)?
What is the horizontal range of the projectile if it is fired at 30° to the horizontal with an initial velocity of 160 ms^(-1)?
What is the velocity of the projectile at t = T/2, given that its time of flight is T and it is fired at 30° to the horizontal?
What is the velocity of the projectile at t = T/2, given that its time of flight is T and it is fired at 30° to the horizontal?
What is the horizontal displacement of the ball after time t?
What is the horizontal displacement of the ball after time t?
What is the vertical component of the velocity of the ball after time t?
What is the vertical component of the velocity of the ball after time t?
What is the direction of the instantaneous velocity of the ball at any point in its motion?
What is the direction of the instantaneous velocity of the ball at any point in its motion?
What is the time of descent of the ball from the top of the staircase to the nth step?
What is the time of descent of the ball from the top of the staircase to the nth step?
What is the horizontal range of the ball from the top of the staircase to the nth step?
What is the horizontal range of the ball from the top of the staircase to the nth step?
What is the minimum horizontal velocity required for the ball to hit the lowest plane?
What is the minimum horizontal velocity required for the ball to hit the lowest plane?
If two bullets are fired horizontally with different speeds from the same height, which one will hit the ground first?
If two bullets are fired horizontally with different speeds from the same height, which one will hit the ground first?
An object is projected horizontally from a height of 40 meters with a velocity of 20 m/s. What is the time of flight?
An object is projected horizontally from a height of 40 meters with a velocity of 20 m/s. What is the time of flight?
A bomb is dropped from an aeroplane flying at a height of 1960 meters. What is the time of flight of the bomb?
A bomb is dropped from an aeroplane flying at a height of 1960 meters. What is the time of flight of the bomb?
What is the horizontal range of a projectile motion with an initial velocity of 20 m/s and a height of 10 meters?
What is the horizontal range of a projectile motion with an initial velocity of 20 m/s and a height of 10 meters?
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