Summative Test in Science 7 (3rd Quarter)

What is an unbalanced force?

• Equal forces acting in opposite directions
• Forces that cause no motion
• Forces that cause an object to change motion
• Forces perpendicular to motion

What force is perpendicular to the surface of an object at rest?

• Friction
• Tension
• Normal force
• Weight

What happens when force is applied to a ceramic plate?

• Plate expands
• Plate may break
• Plate becomes heavier
• Plate speeds up

How do forces affect objects?

• Only make objects move
• Only change shape
• Change motion, shape, or direction
• Have no effect

Which force opposes the intended motion of an object?

• Friction
• Tension
• Normal force
• Weight

What does Isaac Newton's First Law of Motion state?

• Objects at rest stay at rest unless acted upon
• Force equals mass times acceleration
• Every action has an equal and opposite reaction
• Heavier objects fall faster

In which direction does friction act?

• Same as motion
• Opposite to motion
• Perpendicular to motion
• Random direction

Which force is responsible for objects floating in water?

• Tension
• Buoyant force
• Friction
• Electric force

What happens when an unbalanced force is applied to an object?

• It moves at constant speed
• It changes speed or direction
• It remains at rest
• It becomes heavier

What is the significance of free-body diagrams?

• Help visualize all forces acting on an object
• Measure object’s weight
• Show only contact forces
• Illustrate motion path