Understanding Forces and Motion PT

What force pulls objects toward each other?

• Friction

• Gravity

• Mass

• Air resistance

In a vacuum, how do a feather and a rock fall when dropped simultaneously?

• The feather falls faster

• The rock falls faster

• They fall at the same rate

• Neither falls

What is friction?

• A force that speeds up objects

• A force that pulls objects down

• A resistance force between two surfaces

• A measure of mass

How does surface roughness affect friction?

• Smoother surfaces have more friction

• Rougher surfaces have more friction

• All surfaces have the same friction

• Friction does not depend on the surface

What is mass?

• The speed of an object

• The amount of matter in an object

• The distance an object travels

• The force that pulls objects

Why is it harder to push a heavy box than a light box?

• Because of its speed

• Because of its mass

• Because of gravity

• Because of friction

How do you calculate speed?

• Speed = Distance + Time

• Speed = Distance - Time

If a toy car travels 20 meters in 4 seconds, what is its speed?

• 5 m/s

• 10 m/s

• 15 m/s

• 20 m/s

What happens to the motion of an object when friction is increased?

• It speeds up

• It slows down

• It stops moving

• It moves in the opposite direction

Which of the following is NOT a factor that affects motion?

• Gravity

• Friction

• Color

• Mass