Force, Friction, & Motion

A force always changes an object's state of motion.

• True

• False

Answer explanation

An object at rest stays at rest. Not all forces cause motion to change,

If the object is in balance force, then it cannot change its motion.

The net force is the sum of all forces acting on an object.

• True

• False

A force doesn't always change an object's state of motion.

• True

• False

Velocity is non-zero.

• True

• False

Answer explanation

Velocity is zero.

Velocity = distance x time

• True

• False

Answer explanation

Velocity = displacement / time

A car braking is an exmaple of what type of force?

• Gravity

• Air Resistance

• Friction

Rubbing a balloon on your head causes charge to build up on the balloon. The balloon can then "stick" to the wall - what force is acting here?

• Gravity

• Electrostatic

• Friction

• Applied

What is the name of the force responsible for keeping a book on the desk?

• Gravity

• Air Resistance

• Normal Force

• Friction

When a plane is cruising at a constant speed and direction of aircraft, flying at 40,000 ft at 880 km/h westward, what is the current force of the aircraft?

• Balanced Force

• Unbalanced Force

What primary or main force could be at work as a kid rides the swing?

I. Gravitational Force

II. Air Resistance

III. Tension Force

IV. Normal Force

• I and II

• II and IV

• I and III

• II and III