Physics 4th Six Weeks Test Review

An object in uniform circular motion is accelerating because _.

• it is changing speed

• it is changing direction

• it is moving in a straight line

• it has mass

A ball is swinging at a constant speed in a horizontal circle on the top of a level lab table. Which of the following is the direction of the velocity of the ball?

• Inward along the radius.

• Outward along the radius.

• Tangent to the circle, in the direction of motion.

• Along the circumference of the circle, in the direction of motion.

A ball is swung in a horizontal circle at a constant speed. Each circle takes 0.85 seconds to complete and the rope is 0.40 m long. What is the centripetal acceleration?

• 0.19 m/s²

• 1.81 m/s²

• 2.96 m/s²

• 21.86 m/s²

Calculate the velocity of an object moved around a circle with a radius of 1.65 m and an acceleration of 3.5 m/s².

• 2.4 m/s

• 3.9 m/s

• 3.6 m/s

A 1.0 kg rock is moving in a 1.0 m horizontal circle every 3.0 s. The rock experiences _.

• no net force

• a centripetal acceleration

• only the acceleration of gravity

• motion due only to its inertia

What is the proper setup of the gravitational force formula?

• F_g = Gm_2/r

• F_g = ma

• F_g = G^2(m_1+m_2)

• F_g = G (m_1m_2)/r^2

What does the variable G in the gravitational force equation represent?

• Universal gravitational constant

• Combined masses of the two objects

• Gravitational force

• Dielectric constant

Earth is slightly closer to the Sun in December than it is in June. The force of gravity of the Sun on Earth in December compared to June is —

• slightly smaller

• considerably smaller

• slightly larger

• considerably larger

What is the currently accepted value for the gravitational constant (G)?

• 6.67 x 10^-11 N · m^2/kg^2

• 9.11 x 10^-31 N · m^2/kg^2

• 8.99 x 10^9 N · m^2/kg^2

• 6.63 x 10^-34 N · m^2/kg^2

Two objects each have masses of 9,000,000 kg and are 1 meter apart from each other. What's the force of gravity between them? Remember value for G.