Topic 4 Lesson 1 (Reference Point and forces)

Front

What is a reference point?

Back

A reference point is a stationary object used to determine the position of another object. It helps in understanding whether an object is moving or not.

Front

How does the choice of reference point affect the perception of motion?

Back

The perception of motion can change based on the reference point chosen. For example, a person sitting in a moving train may appear stationary to someone on the platform, but moving to another passenger in the train.

Front

What is net force?

Back

Net force is the overall force acting on an object when all the individual forces acting on it are combined. It determines the object's motion.

Front

What happens when forces are balanced?

Back

When forces are balanced, the net force is zero, and the object remains at rest or continues to move at a constant velocity.

Front

What is gravity?

Back

Gravity is a force that attracts two bodies towards each other, commonly experienced as the force that pulls objects towards the Earth.

Front

What is air resistance?

Back

Air resistance is a type of friction that acts against the motion of an object moving through the air, slowing it down.

Front

If an object is not moving, what can we infer about the forces acting on it?

Back

If an object is not moving, the forces acting on it are balanced, meaning the net force is zero.

Front

What is the relationship between force and motion?

Back

Force is required to change the motion of an object. An unbalanced force will cause an object to accelerate, decelerate, or change direction.

Front

What is the unit of force?

Back

The unit of force is the Newton (N).

Front

What does it mean if an object exerts a force equal to another object?

Back

If an object exerts a force equal to another object, they are in a state of equilibrium, and there is no net force acting on either object.