Circular Motion _ GCSE Physics

The video explains the physics of circular motion, highlighting how velocity changes due to constant direction change, leading to acceleration towards the circle's center. This acceleration is caused by centripetal force, which also acts towards the center. Examples include a car on a bend and the moon orbiting Earth. The magnitude of centripetal force depends on speed, mass, and circle radius. Faster speeds, greater mass, and smaller radii require more force to maintain circular motion.

What happens to an object's velocity when it moves in a circle at a constant speed?

• It increases over time.

• It remains constant.

• It decreases over time.

• It changes because the direction changes.

What is the role of friction when a car goes around a bend?

• It increases the car's speed.

• It acts as a centripetal force.

• It slows the car down.

• It has no effect on the car's motion.

In the context of the moon orbiting the Earth, what acts as the centripetal force?

• The moon's speed.

• The Earth's rotation.

• Gravitational attraction.

• The moon's rotation.

How does the speed of an object affect the centripetal force required to keep it in a circular path?

• The force increases as speed increases.

• The force remains constant regardless of speed.

• The force is not related to speed.

• The force decreases as speed increases.

What happens to the centripetal force required if an object moves in a smaller circle?

• The force increases.

• The force remains the same.

• The force becomes zero.

• The force decreases.