Science 7 Third Quarter Exam

What is the SI unit of force?

• Joule

• Newton

• Pascal

• Watt

Which of the following best explains the force of friction?

• A force that always acts upward.

• A force that opposes the motion of an object.

• A force that only acts in the direction of motion.

• A force that is independent of surfaces in contact.

A car of mass 1,000 kg accelerates at 2 m/s². What is the net force acting on the car?

• 500 N

• 1,000 N

• 2,000 N

• 5,000 N

Which of the following scenarios involves both contact and non-contact forces?

• A book resting on a table.

• A ball being thrown upward.

• A car moving on a rough road.

• A magnet attracting a piece of iron.

Which statement about gravitational and magnetic forces is more accurate?

• Both forces can only act when objects are in direct contact.

• Gravitational forces are generally stronger than magnetic forces.

• Gravitational forces depend on mass, while magnetic forces depend on charge or material.

• Magnetic forces only act over small distances, but gravitational forces act over infinite distances.

Which of the following is an example of balanced forces?

• A fruit falling from a tree

• A person jumping into the air

• A box resting on a flat surface

• A car accelerating on a highway

Why does an object moving with constant velocity demonstrate balanced forces?

• Because no forces are acting on the object

• Because only unbalanced forces can act on moving objects

• Because the force of gravity is greater than any opposing force

• Because all the forces acting on the object are equal and cancel out

A man pushes a box with a force of 100 N to the right, and friction exerts a force of 100 N to the left. What will happen to the box?

• The box will remain stationary.

• The box will accelerate to the left.

• The box will accelerate to the right.

• The box will move at a constant velocity.

Some fruit falls freely from a tree. Which force is acting unbalanced on the fruit?

• Air resistance

• Friction

• Gravity

• Normal force

A car is accelerating on a straight road. Analyze the forces acting on the car. Which of the following is true?

• The resistive forces are greater than the forward force.

• There are no forces acting on the car since it is already in motion.

• The forward force exerted by the engine is greater than the resistive forces.

• The resistive forces (e.g., air resistance and friction) equal the forward force.