Understanding Forces in Science

What is a force?

• A force is a measurement of speed.

• A force is an interaction that causes a change in motion.

• A force is a fixed quantity that cannot change.

• A force is a type of energy.

Which of the following is a contact force?

• Gravity

• Magnetism

• Electricity

• Friction

What type of force opposes motion between two surfaces?

• Friction

• Magnetism

• Tension

• Gravity

What is the effect of friction on motion?

• Friction only affects stationary objects.

• Friction has no effect on motion whatsoever.

• Friction increases the speed of moving objects.

• Friction opposes motion and can slow down or stop moving objects.

Which of the following is an example of balanced forces?

• A balloon rising in the air

• A book resting on a table

• A person pushing a heavy box

• A car accelerating on a highway

What happens when forces are unbalanced?

• The object will remain at rest.

• The object will stop moving immediately.

• The object will accelerate in the direction of the net force.

• The object will move in a circular path.

Which type of force is gravity?

• Gravity is a fundamental force.

• Gravity is a frictional force.

• Gravity is a nuclear force.

• Gravity is an electromagnetic force.

What is the unit of force?

• newton (N)

• joule (J)

• watt (W)

• pascal (Pa)

How does increasing the surface area affect friction?

• Friction is only affected by weight, not surface area.

• Increasing the surface area typically increases friction.

• Surface area has no effect on friction.

• Increasing the surface area decreases friction.

What is the role of friction in everyday life?

• Friction increases speed and efficiency of machines.

• Friction has no impact on movement or safety.

• Friction is only a hindrance in all situations.

• Friction enables movement control, prevents slipping, and allows machines to function.