SC3S1U1 Contact and non contact forces

Motion is a change in the _____ of an object.

• A. size
• B. speed
• C. direction
• D. position

Which of the following is an example of a force?

• A book sitting on a shelf.
• A ball rolling down a hill.
• A dog sleeping on the floor
• A pencil lying on a table.

Two volleyball players hit a ball back and forth. If they use the same amount of strength, how are their forces different?

• A. One is stronger than the other.
• B. One moves the ball farther than the other.
• C. They are on different objects.
• D. They are in different directions.

A book is resting on a table. What kind of forces must be acting on the book?

• A. The book must not have any forces acting on it.
• B. The forces acting on the book must be balanced.
• C. The forces acting on the book must be very weak.
• D. The book must have an unbalanced force acting on it.

What happens to an object that has unbalanced forces acting on it?

• A. The object will get bigger.
• B. The motion of the object will change.
• C. The object will stay still.
• D. The object will break apart.

Cal and Max are trying to move a box. If each boy is using an equal force, which picture shows how the box could move the fastest?

• A. Picture 1
• B. Picture 2
• C. Picture 3
• D. Picture 4

Look at the photograph below. If the apple is not moving, which BEST describes the force or forces acting on the apple?

• A. The forces of the hand and gravity on the apple are balanced.
• B. The forces of the hand and gravity on the apple are unbalanced.
• C. The force of gravity is pushing upward on the apple, and it is balanced.
• D. The force of the hand is pushing downward on the apple, and it is unbalanced.

Rocio and Kevin investigated how a push can affect the motion of a still book. The table below shows how far the book moved. What conclusion can you draw from their data?

• A. When the force is stronger, the book moves farther.
• B. When the book is pushed to the right, it moves to the right.
• C. When the force is weaker, the book’s position stays the same.
• D. When two forces push on the book with equal strength, its motion stays the same.

Which of these is an example of back-and-forth motion?

• A. a bowling ball rolling down a lane
• B. a pinwheel spinning around
• C. a child moving on a swing
• D. a top turning

Give an example of a pattern of motion