Fill in the blank: The SI unit for measuring force is the ___, which is defined as the force required to accelerate a 1 kg mass by 1 m/s².

Newton

True or False: Friction always acts in the same direction as the motion of an object.

False. Friction acts in the opposite direction to the motion of the object.

What happens to an object when the weight of the liquid displaced is equal to its weight according to Archimedes' Principle?

The object floats.

Riddle: I push and I pull, but I am not alive. I can change speed and direction, causing objects to thrive. What am I?

A force.

List two examples of contact forces and explain how they work.

Examples of Contact Forces

• Muscular Force: Moves objects like lifting.

• Frictional Force: Opposes motion on surfaces.

Fill in the blank: A force that opposes the motion of objects sliding over one another is known as ___ force.

Frictional

What are the two main categories of forces, and give one example of each.

1. Contact Forces: Example - Muscular force. 2. Non-contact Forces: Example - Gravitational force.

True or False: An object at rest has no forces acting on it.

False. An object at rest can still have balanced forces acting on it.

What is the role of friction when pushing a box across a surface?

Friction opposes the motion of the box, causing it to eventually slow down and stop.

Riddle: I can make you sink or float, depending on my strength and your weight. What force am I?

Buoyant force.

Explain how magnetic force works when two magnets are brought close together.

Magnets can either attract or repel each other depending on the orientation of their poles.