Physics Concepts Quiz

What is a force defined as in physics?

• A type of energy

• A measure of mass

• A push or pull with magnitude and direction

• A scalar quantity with no direction

What is a system in physics?

• A single object with no interactions

• A group of objects treated as a single entity

• An isolated force

• A type of energy

What is an external force?

• A force within a system

• A force exerted by the environment on a system

• A force that does not cause motion

• A force that acts only on atomic scales

When defining a system to include only Lotus, which forces are considered external?

• Forces between the stool and the ground

• Forces within the atomic scale

• Forces between Lotus's arm and shoulder

• Downwards weight force and upwards normal force

What happens when the system is redefined to include both Lotus and the stool?

• The forces between the stool and the ground become internal

• The system no longer experiences any forces

• The total weight and normal force from the ground are external

• The forces between Lotus and the stool become external

What is compression in physics?

• A force that only acts on liquids

• A pair of external collinear forces squeezing an object

• A force that pulls objects apart

• A type of energy transfer

What does the term 'collinear' mean in the context of forces?

• Forces that act at an angle

• Forces that do not interact

• Forces that act in a straight line

• Forces that act in a circular motion

In the example of a cushion, what are the external forces?

• The weight of Ian and the push from the couch frame

• The weight of the cushion itself

• The forces between atoms in the cushion

• The gravitational pull of the Earth

What prevents atoms inside a compressed object from running into each other?

• Magnetic forces

• Gravitational forces

• Internal forces pointing outwards

• External forces

What is the role of internal forces during compression?

• They have no effect

• They cause the object to move

• They counteract external forces

• They increase the size of the object