Forces in nature 7th grade

Luis is pushing a box full of books. Can you tell the effect that Luis’s force has on the box? (Suppose that frictional forces are almost null)

• Deformation

• Motion

• Acceleration

• Speed

Define the different types of materials according to their behaviour under the effect of force. Rigid

• Applying force on this type of materials do not deform it

• This material remains permanently deformed after a force stops acting on it

• Returns to the original shape when a force stops acting on it

• None of the above

Define the different types of materials according to their behaviour under the effect of force. Plastic

• Applying force on this type of materials do not deform it

• This material remains permanently deformed after a force stops acting on it

• Returns to the original shape when a force stops acting on it

• None of the above

Define the different types of materials according to their behaviour under the effect of force. Elastic

• Applying force on this type of materials do not deform it

• This material remains permanently deformed after a force stops acting on it

• Returns to the original shape when a force stops acting on it

• None of the above

Which forces act on each of the bodies in the picture?

• m = gravitational force; M = frictional force

• m = frictional force; M = gravitational force

• None of the above

• m = contact forces; M = at a distance forces

Say if the following sentence is true or false: Rest and movement are absolute concepts.

• True

• False

Say if the following sentence is true or false: The position of an object in motion is the place it occupies with respect

to the reference frame.

• True

• False

Say if the following sentence is true or false: If the trajectory is a straight line and the object in motion doesn’t change

direction, the displacement and the distance covered are not the same.

• True

• False

Study the graph and answer the following question: How does the object move?

• Rectilinear motion

• Curved motion

• Circular motion

• None of the above

Study the graph and answer the following question: What distance will it travel in 10 s?

• 10 m

• 20 m

• 40 m

• None of the above