Friction, Energy, and Simple Machines Quiz

Lara slides a book across a wooden table. What type of friction slows the book down?

• Static

• Kinetic

• Rolling

• No friction

Which of the following best describes static friction?

• It occurs after the object starts moving

• It prevents the object from moving

• It speeds up objects

• It acts in the direction of motion

If a ball slows down while rolling across grass, what is responsible for this change in speed?

• Gravity

• Inertia

• Friction

• Momentum

Which situation best shows the effect of gravity?

• A balloon floating in the air

• A leaf falling from a tree

• A fan blowing air

• A person walking uphill

Why does a person weigh less on the Moon than on Earth?

• There is less gravity on the Moon

• There is more air on the Moon

• The Moon is hotter

• The Moon is larger

A child rides a bike down a hill. Which two forces are working together to move the bike faster?

• Friction and air resistance

• Gravity and motion

• Sound and heat

• Light and friction

Which of the following increases friction?

• Adding oil

• Making the surface rougher

• Making the object lighter

• Using a smoother surface

Which is a practical benefit of gravity?

• Reduces air resistance

• Keeps us on the ground

• Increases friction

• Removes weight

You try to push a heavy box, but it doesn't move. Which friction is acting?

• Kinetic

• Static

• Sliding

• Rolling

How does friction help when walking on a rough surface?

• It makes walking slippery

• It prevents movement

• It gives grip to avoid slipping

• It increases your speed