Understanding Forces in Physics

What is a force according to Kelly O'Shea's definition?

• A stationary object

• A change in temperature

• An interaction between two objects

• A single object moving in space

What is the direction of the gravitational force acting on an object?

• In a circular motion

• Toward the center of the Earth

• Sideways

• Upward

What is the normal force?

• A force that only acts on liquids

• A force that acts in a vacuum

• A force perpendicular to the surfaces in contact

• A force parallel to the surface

When is the normal force present?

• When an object is in a vacuum

• When an object is submerged in water

• When an object is in free fall

• When two objects are in contact

What is the main role of friction?

• To accelerate objects

• To prevent motion or oppose it

• To increase the speed of objects

• To change the color of objects

What is the difference between static and sliding friction?

• Static friction occurs when objects are moving, sliding friction when they are stationary

• Static friction prevents motion, sliding friction opposes motion

• Static friction is stronger than sliding friction

• Static friction is weaker than sliding friction

When is a tension force present?

• When an object is stationary

• When an object is in free fall

• When an object is submerged in water

• When a rope or string is pulled taut

What is a spring force?

• A force that acts only in winter

• A force that acts on liquids

• A force that acts in a vacuum

• A force present when a spring is deformed

What is drag force also known as?

• Normal force

• Air resistance

• Gravitational pull

• Magnetic force

In which direction does the drag force act?

• In the same direction as motion

• In a circular motion

• Perpendicular to the direction of motion

• Opposite to the direction of motion