SCIENCE - Lights and Forces

What is the angle of incidence?

• The angle at which light hits a surface

• The angle of incidence is always 90 degrees regardless of the surface.
• The angle of incidence is the angle between two incoming rays.
• The angle of incidence is the angle between the outgoing ray and the surface.

What happens when light hits a shiny and smooth surface?

• Light passes through

• Light scatters in all directions.
• Light is absorbed completely by the surface.
• Light reflects clearly

Study this image. The pencil bends as it passes from one medium to another.

This phenomenon is called by____

Tick the correct of TWO device which use the principle of light reflection in our daily lives.

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_______ of light happens when light bounces off a surface

• mirror

• reflection

• refraction

• speed

Willy's mass is 35 kg.
Count his weight with Earth's gravity 9.8 N/KG

What will happen if you sit in a car and the driver slams the brake?

• The car will accelerate forward.
• You will feel no change at all.
• You will be pushed back into your seat.
• You may lurch forward if not wearing a seatbelt.

Which of the following shows an example of unbalanced forces action on one or more objects?

• 1 football player pushing another player to the ground.

• A person sitting still in a car

• Two cards leaning each other.

• A person standing still on the ground.

What type of force is shown in the picture?

• Resistance Force

• Friction

• Gravitational force
• Balanced Force

What force brings the pencil down?

• Gravity Force

• Friction
• Normal Force

• Air resistance