Physics Quiz

Which pair of quantities are both scalar quantities?

• speed and mass

• speed and momentum

• momentum and displacement

• mass and displacement

In an attempt to get ketchup out of a bottle, a student takes off the cap, turns the bottle upside down, accelerates it downward, and then suddenly stops it. Ketchup is released from the open bottle because the ketchup doesn’t stop moving when the bottle does. The ketchup leaving the bottle illustrates

• inertia

• resistivity

• resonance

• mass being converted to energy

The same net force is applied to object A and object B. The mass of B is three times greater than the mass of A. Compared to the acceleration of A, the acceleration of B is

• the same

• one-third as great

• three times as great

• one-ninth as great

What is the mass equivalent of 3.37 x 10^-19 joule?

Which object is in equilibrium?

• Earth orbiting the Sun

• a thrown baseball at its highest point above the ground

• a car moving at a constant speed in a straight line

• a bicycle skidding to a stop in a straight line

A race car travels around a flat circular track at constant speed. The net force on the car acts

• perpendicular to the car's velocity and toward the center of the circle

• perpendicular to the car's velocity and away from the center of the circle

• parallel to the car's velocity and in the same direction as the velocity

• parallel to the car's velocity and in the opposite direction as the velocity

An object is traveling in a horizontal, circular path at a constant speed. If the radius of the path were doubled while the speed remained constant, the centripetal acceleration would be

• quartered

• halved

• doubled

• quadrupled

A 600.-newton student pushes on a vertical wall for 20.0 seconds with a constant force having a magnitude of 100. newtons. What is the magnitude of the force that the wall exerts on the student?

• 0.00 N

• 5.00 N

• 100. N

• 600. N

An unbalanced force of 20. newtons is applied to a mass of 1.0 x 10^3 kilograms. After 10. seconds, the momentum of the mass will have changed by

• 2.0 x 10^2 kg•m/s

• 2.0 x 10^3 kg•m/s

• 1.0 x 10^4 kg•m/s

• 2.0 x 10^4 kg•m/s

To lift a heavy block off the floor, a student pulls with force F on a rope that passes over a pulley, as shown in the diagram below. Which pair of vectors represents the perpendicular components of the force the student exerts on the rope?

• Pair 1

• Pair 2

• Pair 3

• Pair 4