Final quiz science

What is gravity?

• a non contact force

• a contact force

• a magnetic force

• a frictional force

Melanie watched the path a baseball followed after a pitcher threw it. She noticed that the ball traveled horizontally away from the pitcher as well as downward toward the ground. What force caused the ball to accelerate in the downward direction when it was thrown?

• air resistance

• applied force

• gravitational force

• electrical force

Why is the friction force considered to be a contact force?

• Friction is produced when objects slide past one another.

• Friction always acts in the same direction.

• Friction acts in a direction opposite to the direction of an object’s motion.

• Friction affects only solid objects.

Why is the magnetic force considered to be a noncontact force?

• Magnets must be far apart in order to exert a force.

• Magnets must be large in size in order to exert a force that is strong enough to notice.

• Magnets do not have to touch each other to experience a force.

A bird flies at 12.5 meters per second. The wind speed is 4.5 meters per second.

What is the speed of the bird when it flies with the wind?

• 17 meters per second

• 12.5 meters per second

• 8 meters per second

• 4.5 meters per second

Predict how the box will move.

A ball is sitting at the top of a ramp. As the ball rolls down the ramp, the potential energy of the ball decreases. What happens to the potential energy as the ball moves?

• It is destroyed as the ball moves.

• It is lost as gravitational energy.

• It is used to make the ball slow down.

• It is converted to kinetic energy.

A toy robot can walk and talk and runs on batteries. Which type of energy is stored in the batteries?

• mechanical

• nuclear

• chemical

• electrical

How is mechanical energy calculated?

• by adding potential energy and kinetic energy

• by multiplying potential energy and kinetic energy

• by subtracting potential energy from kinetic energy

• by dividing potential energy by kinetic energy

Which of these is an example of the conversion of kinetic energy into gravitational potential energy?

• a person parachuting out of an airplane

• a person skiing down a hill

• a car racing around an oval track

• a person walking up a hill