Physics Quiz

What is the definition of static equilibrium?

• The sum of the forces acting on a body must add up to zero.

• The net external torque on a system must be zero.

• Objects in static equilibrium remain at rest, so both the acceleration and the angular acceleration are zero.

• The resultant force (net force and net torque) acting on the system is zero and the object is not moving at all in either translational or rotational motion.

Which of the following is a common misconception related to the concept of force?

• Force can always cause motion.

• Force always acts in the direction of motion.

• The larger the force acting on an object, the greater the effect.

• Force always requires physical contact between objects to exert a force.

According to Kepler's laws of planetary motion, what shape do planetary orbits have?

• Hyperbolas

• Perfect circles

• Ellipses

• Parabolas

What is the cause of tides in the ocean?

• Gravitational force exerted by the moon and sun

• Magnetic force from the Earth's core

• Centrifugal force from the Earth's rotation

• Electromagnetic force between the Earth and the moon

Which statement is true according to Newton's law of universal gravitation?

• The square of a planet's orbital period is proportional to the cube of its average distance from the Sun.

• The speed of a planet in its orbit around the Sun is constant.

• The orbits of planets around the Sun are perfect circles.

• A line drawn from the Sun to a planet sweeps out equal areas in equal times.

What is the mechanism through which energy is transferred from one system to another?

• Power

• Work

• Force

• Energy

What is the role of simple machines like levers, pulleys, and inclined planes?

• To store energy

• To create energy

• To amplify force and alter direction

• To transfer energy

What is the net force acting on an object that determines its acceleration?

• Normal force

• Frictional force

• Gravitational force

• Resultant force

What is the law that states for every action, there is an equal and opposite reaction?

• Newton's Second Law

• Newton's First Law

• Newton's Third Law

• Kepler's Law

What is the concept that describes a force that opposes motion between two surfaces that are touching?

• Centripetal force

• Spring force

• Frictional force

• Tension force