Yr7 Balances, unbalanced, contact, non-contact forces

What are balanced forces?

• Forces that cause an object to start moving

• Forces that are equal in magnitude but opposite in direction, resulting in no change in motion

• Forces that result in an acceleration of an object

• Forces applied only through physical contact

Answer explanation

Forces that are equal in magnitude but opposite in direction, resulting in no change in motion

What are unbalanced forces?

• Forces that exactly cancel each other out

• Forces that cause a change in the motion of an object

• Forces that are equal in magnitude and direction

• Forces that can only act at a distance

Answer explanation

Forces that cause a change in the motion of an object

Which of the following is an example of a contact force?

• Gravity

• Magnetic force

• Friction

• Electric force

Answer explanation

Friction is an example of a contact force because it occurs when two objects are in contact and rub against each other.

Which of the following is an example of a non-contact force?

• Tension

• Air resistance

• Gravity

• Spring force

Answer explanation

Gravity is an example of a non-contact force because it acts at a distance without direct contact between objects.

What is the effect of balanced forces on an object's motion?

• It causes the object to accelerate

• It causes the object to move in a circular path

• It does not change the motion of the object

• It slows down the object gradually

Answer explanation

It does not change the motion of the object

What is the effect of unbalanced forces on an object?

• The object remains at rest

• The object moves at a constant velocity

• The object accelerates

• The object disappears

Answer explanation

The object accelerates

Which of the following is a contact force?

• Light

• Sound

• Pushing a cart

• Magnetic attraction

Answer explanation

Pushing a cart is a contact force because it involves direct physical contact between objects.

Identify a non-contact force from the following options.

• Pulling a wagon

• Kicking a football

• Wind blowing

• Holding a book

Answer explanation

The correct non-contact force from the options provided is 'Wind blowing' as it acts on objects without physical contact.

What happens when the forces acting on an object are balanced?

• The object starts moving faster

• The object changes direction

• There is no change in the object's motion

• The object begins to rotate

Answer explanation

When the forces acting on an object are balanced, there is no change in the object's motion.

What results from unbalanced forces acting on an object?

• The object remains stationary

• The object moves at a constant speed

• The object experiences a change in motion

• The object maintains its current direction

Answer explanation

Unbalanced forces acting on an object result in a change in motion, causing the object to accelerate, decelerate, or change direction.