Chapter 3 Review

The kilogram is the SI unit for___________.

• Velocity

• Mass

• Acceleration

• Momentum

The force of gravity on an object is its ____________________.

• Weight

• Mass

• Centripetal force

• Net force

The sum of all forces on an object is the __________________.

• Net force

• Momentum

• Balanced force

• Centripetal force

An object that has _______________ acting on it acts as if there were no forces acting on it at all.

• Balanced force

• Net force

• Momentum

• Centripetal force

A car races around a circular track. Friction on the tires is the _________________ that acts towards the center of the circle and keeps the car on the circular path.

• Centripetal force

• Momentum

• Net force

• Weight

A heavy train requires nearly a mile to come to a complete stop because it has a lot of ______________________.

• Momentum

• Mass

• Weight

• Centripetal force

A person accelerates a box across a flat table with a force less than the weight of the box. Which force is weakest?

• The sliding friction against the box.

• the applied force against the box.

• the force of the table on the box.

A train moves at a constant speed on a straight track. Which statement is true?

• The forces of the train's engine balances friction.

• No horizontal forces act on the train as it moves.

• An unbalanced force keeps the train moving.

The Moon orbits Earth in a nearly circular orbit. What is the centripetal force?

• Earth's gravitational pull on the Moon

• the push of the Moon on Earth

• the outward force on the Moon

Which does NOT describe a force pair?

• When you push on a bike's brakes, the friction between the tires and the road increases.

• Then a diver jumps off a diving board, the board pushes the diver up.

• When a boy pulls a toy wagon, the wagon pulls back on the boy.