Physics Multiple Choice Concepts

Generally speaking the more mass an object has, the less force it requires to accelerate.

• True

• False

Answer explanation

The more mass an object has, the more force is required to accelerate it.

If I roll a ball across the floor, it will slow down and eventually stop. Select ALL of the forces that would slow the ball down.

• The Floor

• Wind Resistance

• Friction

• Gravity

• Time

Answer explanation

The floor and time are not forces.

When a baseball bat hits a baseball, it is accurate to say that the baseball is hitting the bat with an equal amount of force.

• True

• False

Answer explanation

This is an example of Newton's Third Law: every action has an equal and opposite reaction.

If an object is experiencing equilibrium of forces, it is impossible for the object to be in motion.

• True

• False

Answer explanation

Think about a book at rest on a table. The book is experiencing equilibrium of forces (the book pushes down on the table, the table pushes up on the book). However, the book is technically still in motion because the Earth is rotating, spinning, and traveling through space. The book is part of a system that is in motion, even though the Net Force acting on the book is 0 N.

The unit for force is:

• Kilograms

• Newtons

• Pascals

• m/s²

Equilibrium of forces means the net force acting on an object is 0 N.

• True

• False

Answer explanation

Two forces acting in opposite directions that cancel each other out.

The unit for mass is:

• Kilograms

• Newtons

• Pascals

• m/s²

Every action has an equal and opposite reaction. If I push against a wall (the action), the reaction will be:

• The wall moves.

• I move because the wall has more mass.

• The wall pushes back against me.

• There is no reaction.

If an equal amount of force is applied to two objects, the object with less mass will accelerate faster than an object with more mass.

• True

• False

Answer explanation

In general, objects with less mass accelerate faster than objects with more mass.

Force and acceleration are not proportional. If I double the force on an object, it will not affect the acceleration.

• True

• False

Answer explanation

Force and acceleration are directly proportional. Any change to the force will affect the acceleration.