Types of Forces

Which force pulls objects toward the center of the Earth?

• Magnetic force

• Gravitational force

• Frictional force

• Applied force

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What type of force is exerted by a magnet on a piece of iron?

• Normal force

• Magnetic force

• Frictional force

• Gravitational force

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Which force acts in the opposite direction to the surface when an object rests on a table?

• Normal force

• Applied force

• Gravitational force

• Magnetic force

What type of force opposes the motion of a sliding book on a table?

• Gravitational force

• Magnetic force

• Frictional force

• Normal force

A person pushes a box across the floor. Which force is directly responsible for moving the box?

• Gravitational force

• Normal force

• Applied force

• Magnetic force

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A book is lying on a table. Identify all the forces acting on the book.

• Only gravitational force

• Gravitational force and normal force

• Gravitational force and magnetic force

• Only normal force

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If you slide a metal paperclip toward a magnet and it speeds up, which forces are acting on the paperclip?

• Only frictional force

• Magnetic force and frictional force

• Only gravitational force

• Normal force and applied force

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A student pushes a box across a rough floor. Which two forces are acting in opposite directions as the box moves?

• Gravitational force and normal force

• Applied force and frictional force

• Magnetic force and gravitational force

• Normal force and frictional force

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NGSS.MS-PS2-2

A metal ball is dropped near a strong magnet. Predict and explain what will happen to the ball as it falls.

• It will fall straight down due to gravity only.

• It will be pulled sideways toward the magnet due to magnetic force, as well as down due to gravity.

• It will stop in mid-air due to normal force.

• It will bounce upward due to friction.

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A student slides a wooden block across a table and notices it slows down and stops. Using your knowledge of forces, explain why the block stops.

• The normal force pushes it forward.

• The gravitational force pulls it forward.

• The frictional force opposes its motion and causes it to stop.

• The applied force keeps it moving.

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