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Physics Chapter 4 : Topic 4
Motion in a Curved Path
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When a force acts perpendicular to the velocity of an object, it changes:
Reasoning: A perpendicular force changes the direction of velocity without changing its magnitude.
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An object moving with constant speed in a circular path has:
Reasoning: Velocity changes because its direction changes continuously.
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The force responsible for circular motion is called:
Reasoning: Centripetal force acts toward the center of the circular path.
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Centripetal force always acts:
Reasoning: The inward force maintains circular motion.
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In uniform circular motion, the speed of an object is:
Reasoning: Only the direction changes, not the magnitude of velocity.
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Although speed remains constant in circular motion, acceleration exists because:
Reasoning: Acceleration occurs whenever velocity changes.
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The acceleration directed toward the center of a circular path is called:
Reasoning: Centripetal acceleration maintains circular motion.
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The direction of centripetal acceleration is:
Reasoning: It acts inward and changes the direction of motion.
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If the centripetal force suddenly disappears, an object moving in a circle will:
Reasoning: Without the inward force, the object follows Newton's First Law.
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The force needed to keep a satellite in orbit around Earth is:
Reasoning: Earth’s gravity provides the centripetal force.
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The velocity of an object in circular motion is always:
Reasoning: Instantaneous velocity is always tangent to the circular path.
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A stone tied to a string and rotated in a circle requires tension because tension provides:
Reasoning: String tension pulls the stone toward the center.
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If the speed of an object moving in a circle doubles, its centripetal acceleration becomes:
Reasoning: $\mathbf{a}_{\mathbf{c}}\mathbf{=}$ $\frac{\mathbf{v}^{\mathbf{2}}}{\mathbf{r}}$ ; Acceleration depends on square of velocity.
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If radius of circular motion increases while speed remains constant, centripetal acceleration:
Reasoning: $\mathbf{a}_{\mathbf{c}}\mathbf{=}$ $\frac{\mathbf{v}^{\mathbf{2}}}{\mathbf{r}}$ ; Larger radius gives smaller acceleration.
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A force perpendicular to velocity does no work because:
Reasoning: Work $\mathbf{= W = Fd\ cos\ \theta}$ and $\mathbf{cos\ }\mathbf{90}^{\mathbf{o}}\mathbf{= 0}$
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In uniform circular motion, kinetic energy remains constant because:
Reasoning: A perpendicular force changes direction but not speed.
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A car moving around a circular track experiences centripetal force provided by:
Reasoning: Static friction provides the inward force for turning.
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Which quantity changes during uniform circular motion?
Reasoning: Velocity changes due to continuous change in direction.
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The centripetal acceleration of an object is given by:
Reasoning: Centripetal acceleration depends on velocity squared and radius.
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An object moving in a circle has acceleration even if its speed is constant because:
Reasoning: A change in direction of velocity means acceleration exists.
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The centripetal force on an object moving in a circle is:
Reasoning: Net inward force is required for circular motion.
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A planet revolves around the Sun because:
Reasoning: The Sun’s gravitational attraction keeps planets in orbit.
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A passenger in a turning car feels pushed outward because:
Reasoning: Due to inertia, the body resists the change in direction.
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When a force acts perpendicular to velocity, the work done is:
Reasoning: Perpendicular force causes no change in kinetic energy.
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The direction of centripetal force continuously changes because:
Reasoning: The inward direction is different at every point on the circle.
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A satellite in circular orbit has:
Reasoning: Gravity changes direction of velocity while maintaining orbital speed.
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If a body moves in a circular path with radius doubled and speed doubled, centripetal acceleration becomes:
Reasoning: $\mathbf{a}_{\mathbf{c}}\mathbf{=}$ $\frac{\mathbf{v}^{\mathbf{2}}}{\mathbf{r}}$ ; New acceleration: $\mathbf{a}_{\mathbf{c}}\mathbf{=}$ $\frac{\mathbf{(2}\mathbf{v}\mathbf{)}^{\mathbf{2}}}{\mathbf{2}\mathbf{r}}\mathbf{= 2}\frac{\mathbf{v}^{\mathbf{2}}}{\mathbf{r}}$
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Which force can act as a centripetal force?
Reasoning: Centripetal force is not a new force; it is any inward net force.
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If an object moves in a circular path at constant speed, its acceleration is:
Reasoning: Centripetal acceleration direction changes continuously.
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A ball attached to a string moves in a circle. If the string breaks, the ball moves:
Reasoning: The ball continues with its instantaneous velocity due to inertia.
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A force perpendicular to motion can change:
Reasoning: Perpendicular force changes velocity direction only.
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The unit of centripetal acceleration is:
Reasoning: Acceleration is measured in meters per second squared.
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Which example represents motion caused by a perpendicular force?
Reasoning: Friction provides the perpendicular centripetal force.
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The magnitude of centripetal acceleration increases when:
Reasoning: $\mathbf{a}_{\mathbf{c}}$ depends on $\mathbf{v}^{\mathbf{2}}$.
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In circular motion, the force perpendicular to velocity:
Reasoning: It changes momentum direction while keeping magnitude constant.
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Which statement correctly describes motion in a curved path due to perpendicular force?
Reasoning: A perpendicular force produces centripetal acceleration, causing curved motion without changing speed.
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