Science 8: Force, Motion, and Energy - Chapters 1 & 2

What is force?

• A scalar quantity

• A push or pull resulting from an interaction between objects

• A measure of mass

• A type of energy

Which of the following is a contact force?

• • Gravitational pull

• • Magnetic force

• • Friction

• • Electrostatic force

What is the unit of force in the International System of Units (SI)?

• • Dyne

• • Joule

• • Newton

• • Pascal

What does Newton’s first law of motion state?

• • Force equals mass times acceleration

• • 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 a force

• • The net force on an object is zero

What is inertia?

• • The force that opposes motion

• • The resistance of an object to a change in its state of rest or uniform motion

• • The force that attracts objects toward Earth’s center

• • The ability of an object to conduct electricity

You push a chair across the floor, and it eventually comes to a stop. Which force is primarily responsible for stopping the chair?

• • Gravity

• • Normal force

• • Friction

• • Magnetic force

A book is resting on a table. What force is counteracting the force of gravity on the book?

• • Friction

• • Normal force

• • Tension

• • Applied force

You drop a ball, and it falls to the ground. What type of force is acting on the ball?

• • Contact force

• • Noncontact force

• • Frictional force

• • Normal force

A magnet attracts a piece of iron without touching it. What type of force is this?

• • Contact force

• • Noncontact force

• • Frictional force

• • Normal force

You push a toy car, and it accelerates. Which of Newton’s laws explains this motion?

• • First law

• • Second law

• • Third law

• • Law of universal gravitation