Physics Quiz

How do you know if an object is accelerating?

• It is moving at a constant speed.

• It is changing direction.

• It is not moving.

• It is moving in a straight line.

Answer explanation

An object is accelerating if it is changing direction, indicating a change in velocity over time.

What is meant by balanced force? Give an example.

• Forces that cause an object to start moving.

• Forces that cause an object to stop moving.

• Forces that are equal in size and opposite in direction.

• Forces that cause an object to change direction.

Answer explanation

Forces that are equal in size and opposite in direction are known as balanced forces, which result in no change in the object's motion.

What is meant by unbalanced force? Give an example.

• Forces that are equal in size and opposite in direction.

• Forces that cause an object to move at a constant speed.

• Forces that cause an object to change its motion.

• Forces that do not affect the motion of an object.

Answer explanation

Forces that cause an object to change its motion.

An object with a small mass has ________________ inertia than an object with a large mass.

• more

• less

• the same

• no

Answer explanation

An object with a small mass has less inertia than an object with a large mass, as inertia is directly proportional to mass.

State Newton’s 3rd Law of motion.

• For every action, there is an equal and opposite reaction.

• An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.

• The force acting on an object is equal to the mass of the object times its acceleration.

• The total momentum of objects before a collision is equal to the total momentum of the objects after a collision.

Answer explanation

For every action, there is an equal and opposite reaction.

When distance is increased, the force of gravity does what?

• Increases

• Decreases

• Stays the same

• Disappears

Answer explanation

When distance is increased, the force of gravity decreases, as described by the inverse square law in physics.

When mass is increased, what happens to the force of gravity?

• Increases

• Decreases

• Stays the same

• Disappears

Answer explanation

When mass is increased, the force of gravity also increases according to the law of universal gravitation.

An object experiences _______________ as it falls towards Earth and the only force acting on the object is gravity.

• Balanced force

• Free fall

• Constant speed

Answer explanation

An object experiences free fall as it falls towards Earth when the only force acting on it is gravity.

What is the unbalanced force that slows down a ball rolling across the floor?

• Gravity

• Friction

• Air resistance

• Inertia

Answer explanation

Friction is the unbalanced force that slows down a ball rolling across the floor.

The total momentum of objects before a collision ________________ the total momentum of the objects after a collision.

• Is greater than

• Is less than

• Is equal to

• Is not related to

Answer explanation

The total momentum of objects before a collision is equal to the total momentum of the objects after a collision.