Understanding Forces for Grade 4

What is a force?

• A force is a type of energy.

• A force is a fixed quantity that cannot change.

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

• A force is a measurement of speed.

Name two types of forces.

• Electric force

• Nuclear force

• Gravitational force, Frictional force

• Magnetic force

What is the force that pulls objects towards the Earth?

• Gravity

• Electromagnetism

• Friction

• Magnetism

What do we call the force that opposes motion?

• Friction

• Gravity

• Inertia

• Momentum

What is friction?

• Friction is the temperature increase caused by two surfaces rubbing together.

• Friction is the force that opposes the relative motion of two surfaces in contact.

• Friction is the force that enhances the motion of two surfaces in contact.

• Friction is the energy lost when two surfaces slide over each other.

Can you give an example of a contact force?

• Gravity

• Friction

• Magnetism

• Tension

What is a non-contact force?

• A non-contact force is only applicable in space.

• A non-contact force is a force that acts on an object without physical contact.

• A non-contact force can only be observed in liquids.

• A non-contact force requires physical touch to act.

What happens to an object when a force is applied?

• The object will always remain stationary.

• The object will spontaneously combust.

• The object will float in the air without support.

• The object may accelerate, change direction, or deform.

How does gravity affect objects on Earth?

• Gravity has no effect on the motion of objects.

• Gravity only affects large objects like planets.

• Gravity pushes objects away from the Earth.

• Gravity causes objects to be pulled towards the Earth, giving them weight and influencing their motion.

What is the difference between push and pull forces?

• Pull forces can only be applied vertically.

• Push forces are always stronger than pull forces.

• Push forces move objects away; pull forces draw objects closer.

• Push and pull forces are the same in all situations.