A car travels around a circular roundabout at a constant speed. Is the car accelerating?

No — it is moving at constant speed so there is no acceleration Yes — its direction is constantly changing, which means its velocity is changing, which is acceleration Only if it speeds up or slows down around the roundabout No — acceleration only occurs in straight-line motion

What is centripetal force?

A force pushing objects outward from the centre of a circle The net force directed toward the centre of a circular path that keeps an object moving in a circle A special fundamental force that only exists in circular motion The force of gravity acting on an orbiting object

You swing a ball on a string in a horizontal circle above your head. What force provides the centripetal force keeping the ball in its circular path?

The outward pull of the ball on the string Air resistance pushing the ball inward The tension in the string, directed toward your hand at the centre The weight of the ball pulling it toward Earth

If the string holding a ball in circular motion suddenly breaks, which path does the ball take?

It spirals outward in a widening circle It moves directly away from the centre of the circle A straight line tangent to the circle at the point where the string broke It curves inward because of gravity

What is the difference between speed and velocity for an object moving in a circle at constant speed?

Both speed and velocity are constant in circular motion Speed is constantly changing, but velocity stays the same Speed is constant, but velocity is constantly changing because the direction of motion keeps changing Neither speed nor velocity is constant in circular motion

A ball is thrown horizontally from a cliff. Ignoring air resistance, which statement correctly describes its motion?

It immediately falls straight down because gravity overpowers the horizontal throw It moves in a straight diagonal line at a constant angle It moves horizontally at constant speed while simultaneously accelerating downward due to gravity It slows horizontally as it falls, since all its energy converts to downward motion

Two identical balls are released at exactly the same moment from the same height. Ball A is dropped straight down; Ball B is launched horizontally. Which hits the ground first?

Ball A — it falls straight down without wasting energy going sideways Ball B — its horizontal speed adds to its falling speed They hit the ground at the same time — horizontal velocity does not affect the time to fall It depends on how fast Ball B was launched horizontally

What shape is the path followed by a projectile launched at an angle (ignoring air resistance)?

A straight line A circle A parabola An ellipse

A satellite orbits Earth in a circular orbit. What force provides the centripetal force keeping it in orbit?

The rocket engine keeping it moving The centrifugal force pushing it away from Earth Air resistance in the upper atmosphere Gravity — Earth's gravitational pull on the satellite is directed toward Earth's centre

A tennis player hits a ball horizontally at the top of the net. The ball lands in the service box 6 metres away. What causes the ball to land instead of flying in a straight horizontal line?

Air resistance slows the ball and makes it fall The ball runs out of horizontal velocity after a short distance Gravity accelerates the ball downward continuously, curving its path into a parabola The spin of the ball causes it to curve downward