Force and Motion Review

A wagon is being pushed in a straight line. How would an increase in friction on th wagon wheels affect the wagon?

• It would cause the wagon to move faster.

• It would cause the wagon to change mass.

• It would cause the wagon to change direction.

• It would cause the wagon to slow down.

Why does a bicycle slow down when the brakes are applied?

• The brakes heat the rubber on the bicycle tires.

• The brakes add energy to the bicycle.

• The brakes increase the force of gravity on the bicycle.

• The brakes cause frictional force on the wheels of the bicycle.

A ball is kicked across a field and it rolls until it comes to a stop. What is most responsible for the ball coming to a stop?

• gravity

• air

• friction

• mass

Tags

NGSS.MS-PS3-5

What causes a wagon to increase speed when going down a hill?

• gravity

• friction

• air pressure

• mass

Four balls each with a different mass roll down a hill. Which ball would require the most force to stop its motion?

• ball with a mass of 5 kg

• ball with a mass of 10 kg

• ball with a mass of 15 kg

• ball with a mass of 20 kg

A girl walked for 30 minutes. She noticed that she walked farther in the first 15 minutes of walking than in the second 15 minutes. What can she conclude about her walk?

• She walked over many hills.

• Her average speed was faster over the first half of the walk.

• She walked in two different directions.

• She was walking at a constant speed.

What can cause a moving object to increase its speed in a forward direction?

• a force pushing on the object in the opposite direction.

• an increase in the mass of the object.

• a decrease in the mass of the object.

• a force that continually acts on the object in the direction the object is moving.

A student launches objects of different weight with a rubber band with the same amount of force. Which object will most likely move the fastest?

• paper clip 0.5 grams

• piece of paper 1 gram

• eraser 2 grams

• rubber ball 10 grams

A pencil falls off of a desk. What moves the pencil toward the floor?

• mass

• friction

• gravity

• speed

Which object has the greatest momentum?

• a car traveling 60 miles per hour

• a freight train traveling 20 miles per hour

• a book falling off a desk

• a leaf falling from a tree