Force and Motion 2.1

The model shows a force acting on a car. The amount of the force is represented by the size of the arrow. A second force is applied to the car. As a result, the car’s motion stops changing. Which of the following models best represents the forces acting on the car as the second force is applied?

• A

• B

• C

• D

Which definition best describes force?

• A force is a row of bowling pins

• A force is always very strong

• A force is a push or a pull, and force is required to change the motion of any object.

• A force is always very weak

Which image shows the magnets repelling?

• Image 1

• Image 2

Vincent wants to move an object using touching forces. Which test will show that touching forces move objects?

• He could drop a feather from several different heights and see how fast it falls.

• He could pull a toy car with a string until it hits another toy car.

• He could rub a balloon on his shirt and hold it over his head to make his hair stand up.

• He could use a magnet to pull a stack of paper clips from one end of the table to another.

Is this statement True or False? All metals are attracted to magnets.

• False

• True

The image shows a phone being dropped on to the ground. What non-touching force pulls the phone to the ground?

• magnetic force

• attraction

• gravity

• repulsion

What do scientists call it when a magnet pushes away another magnet?

• attract

• poles

• repel

• investigation

The Earth pulls objects down with the force of _.

• gravity

• magnetism

• friction

• electricity

A force is a _ or pull that can start, stop, or change the direction of an object's motion.

• push

• twist

• lift

• drop

Balanced and unbalanced forces are types of forces that affect motion. Which of the following statements is true about balanced forces?

• They cause a change in the object's motion.

• They do not cause a change in the object's motion.

• They always act in the same direction.

• They only occur in moving objects.