Short Q/A Dynamics – II - Students Free Notes

Short Q/A Dynamics – II

Why do we lean forward when climbing uphill and lean backward when going downhill?

When climbing uphill, we lean forward to keep our center of gravity over our feet, preventing us from falling backward. While going downhill, we lean backward to counterbalance the forward pull of gravity, maintaining stability. Related Questions: Why door knobs are fixed at the edge of door? What will happen it the door knob is … Read more

Why is it important for communication satellites in geostationary orbit to maintain a specific speed?

Communication satellites in geostationary orbit must maintain a specific speed to match the Earth’s rotational period (24 hours). This ensures that they remain fixed relative to a specific location on Earth, allowing continuous communication coverage. If the speed changes, the satellite may drift out of position, disrupting communication signals. Related Questions: Why door knobs are … Read more

Consider a situation where you swing a ball connected to a string in a circle. How does the tension in the string vary as the ball moves across different points in its circular path, and what forces are involved?

As the ball swings in a circular motion, the tension in the string varies. It is maximum at the lowest point of the swing due to the combination of gravitational force and the required centripetal force. At the highest point, the tension is lower because gravity partially contributes to the required centripetal force. The forces … Read more

While driving what happens if the driver take the curve too fast? How does centripetal force play a role in keeping the car from skidding off the road?

If a driver takes a curve too fast, the car may skid off the road due to insufficient centripetal force. Centripetal force is required to keep the car moving in a circular path. If the speed is too high, the available friction between the tyres and the road may not provide enough centripetal force, causing … Read more

Why is a pencil standing on its tip unstable, and what factors affect the stability of an object balanced on a point?

A pencil standing on its tip is unstable because its center of gravity is high and has a very small base of support. Small disturbances can easily shift its center of mass outside the base, causing it to topple. Stability depends on the object’s height, base width, and the position of its center of mass. … Read more

Why a moving bicycle is easier to balance? Relate this to the principles of rotational motion.

A moving bicycle is easier to balance because of angular momentum and gyroscopic stability. As the wheels spin, they create a stabilizing force that resists tipping over. Additionally, steering adjustments help maintain balance, making a moving bicycle more stable than a stationary one. Related Questions: Why door knobs are fixed at the edge of door? … Read more

When standing on a crowded school bus, which stance would provide better stability and prevent you from being pushed over: legs joined or legs spread apart?

Standing with legs spread apart provides better stability on a crowded bus because it increases the base of support and lowers the center of gravity. This helps resist forces from sudden movements or external pushes, preventing loss of balance. Keeping legs together creates a narrow base, making it easier to be pushed over. Related Questions: … Read more

Explain why it’s easier to push a car on flat tyres than inflated ones. What happens to the frictional force between the tyres and the road?

A car on flat tyres is easier to push than one with inflated tyres because flat tyres increase the surface area in contact with the road, reducing the pressure and making it easier to overcome static friction. Inflated tyres have less contact area, leading to a higher normal force and increased friction, making the car … Read more