6th Force and Motion

The diagram shows a homemade car being pushed with a force of 25 N

The force causes the car to move at a constant speed of 3 m/s.

What will happen if the force on the homemade car is changed to 35 N?

• The car will move backwards.

• The speed of the car will not change.

• The speed of the car will increase.

• The speed of the car will decrease.

The picture below shows a nail made of magnetic metals that is placed near a magnet.

What will happen to the nail if the magnet is moved closer to it?

• The nail will move away from the magnet due to the pushing force by the magnet.

• The nail will move toward the magnet due to a pulling force by the magnet.

• The nail will stay in its same position because gravity is pushing up on it.

• The nail will rise upward due to the force of air resistance.

Which property of an object cannot be changed without changing that object's gravitational force on other objects?

• Color

• Hardness

• Mass

• Volume

The graphs below show the distance and time traveled by Object X and Object Y.

Which statement is correct about the two objects?

• 1. Neither object is traveling at a constant speed, and Object X is traveling at a slower speed than Object Y.

• 1. Objects X and Y are traveling at the same speed.

• 1. Both are traveling at a constant speed, but Object X is traveling at a

     faster speed than Object Y.

• 1. Objects X and Y are speeding up over time.

Which of the following is the best explanation of something in the natural world that is currently considered true and has been studied and supported by a large group of scientists?

• Scientific law

• Scientific fact

• Scientific theory

• Scientific hypothesis

Two objects have a certain gravitational force between them.

What would happen if the mass of one of the objects suddenly increased?

• The mass of the other object would increase.

• The distance between the objects would increase.

• The gravitational force of the objects would remain constant.

• The gravitational force between the objects would increase.

There are many types of forces.

Which statement best compares an electrical force to a gravitational force?

• Electrical forces hold small objects near each other and gravitational forces hold large objects near each other.

• Electrical forces depend on the type of charge and gravitational forces depend on the mass of the objects and how far apart they are.

• Electrical forces are attractions between similar types of charges and gravitational forces are attractions between similar sizes of objects.

• Electrical forces require that the objects are in contact with each other and gravitational forces require that the objects are far from each other.

The picture shows four friends climbing a mountain. Use the picture to answer any questions that follow.

If all four friends weigh the same amount, which person feels the least pull of gravity from Earth?

• Allison

• Dennis

• Benjamin

• Callie

The acceleration of a falling object does not depend on its mass. How does the mass of an object affect the force of gravity experienced by the object?

• The force of gravity increases as its mass increases

• The force of gravity decreases as its mass decreases

• The force of gravity is the same for all objects because acceleration is the same.

• The force of gravity is the same for all objects because the force is determined by Earth's mass

A hobbyist collected data about the motion of a toy train on a straight track and then recorded the data in the graph below.

Which of these accurately describes the motion of the toy train?

• 1. The toy train speeds up while going forward and then slows down.

• 1. The toy train slows down while going forward and then moves backward.

• 1. The toy train moves forward at a constant speed, slows down, and then stops.

• 1. The toy train moves forward at an increasing speed, stops, and then

     moves forward.