Science Smart. 5.7 More About Forces

Forces that exerted between objects that are not touching each other

• Gravity

• Elastic Spring

• Magnetic

• Air Resistence

• Friction

Forces that causes moving objects to slow down, which occurs between any two surfaces in contact.

• Gravity

• Elastic Spring

• Magnetic

• Air Resistence

• Friction

Forces that exerted when a spring is compressed or stretched ...

• Gravity

• Elastic Spring

• Magnetic

• Air Resistence

• Friction

Forces that slows down moving object in air

• Gravity

• Elastic Spring

• Magnetic

• Air Resistence

• Friction

Earth exerts a pulling forces on all objects toward the ground

• Gravity

• Elastic Spring

• Magnetic

• Air Resistence

• Friction

The amount of friction experienced by an object depend on the type of surface.

• The rougher the surface, the greater the friction

• The rougher the surface, the smaller the friction

• The rougher the surface, the smoother the friction

• The smoother the surface, the greater the friction

Air resistence is a type of friction too.

• True

• False

Oil can reduce the friction between two surfaces.

• True

• False

Because of the ... all objects have weight.

We can reduce friction by ...

• put wheels on objects

• push to move an objects

• pull to move an objects

• hold objects firmly