Year 4 LO 8 - How do things move?

Friction is a force that acts in an ___________ direction of movement.

• same

• opposite

• parallel

• west

Bicycle chain oil is an essential item for your bike maintenance. It ensures that the moving parts of your bike chain move smoothly and also it stops the rusting process. Oil between the bicycle parts will ___________ friction.

• increase

• decrease

• keep the same

• eliminate completely the

How does friction affect speed?

• More friction decreases speed.

• More friction increases speed.

• Less friction decreases speed.

• Less friction speed stays the same.

Which of the following are good examples of friction that is helpful?

• Brakes used on a bike.

• Tires from a car on the road.

• Rubber soles on your shoes.

• All are examples that are helpful.

Because of friction, rubbing your hand together creates ____________.

• heat

• air resistance

• gravity

• volume

Is the following statement correct?

The rougher the surface, the faster an object will travel over the surface.

• True

• False

In which practical way does friction help us in our everyday life?

• Brakes on a car.

• Sliding down a slide.

• Skiing down a slope.

• All of the above.

Which surface has the least amount of friction from the following?

• Carpet

• Ice

• Grass

• Concrete

Which material should be used on a bicycle ramp to increase friction?

• Shiny metal surface.

• Smooth wood.

• Wet plastic.

• Rough concrete surface.

Why is it easy to slip when the the floor is wet?

• The water reduces the friction between your feet and the floor.

• The water increases the friction between your feet and the floor.

• There is air resistance acting on your feet.

• There is less force of gravity.