You throw a ball straight up, it peaks out and then comes back down to you. During this motion, the velocity and acceleration always point in the same direction.
Indicate whether the statement is true or false
[Ques. 2] A loop of wire in a generator produces alternating current by:
a. rotating in a constant electric field.
b. rotating through areas of high and low electrical force.
c. creating current by rotating in an existing magnetic field.
d. creating a varying magnetic field with its rotational kinetic energy.
e. being wound around a metal core to produce an electromagnet.
[Ques. 3] When a body moves with uniform acceleration, the net force on it is zero.
Indicate whether the statement is true or false
[Ques. 4] Which statement is NOT true?
a. A transformer contains a primary coil of wire and a secondary coil of wire wound around the same iron core.
b. A transformer changes one voltage to another.
c. A transformer works because changing magnetic fields can induce electric fields.
d. A transformer operates on direct current as well as on alternating current.
e. Transformers are commonly used for delivering household electric power.
[Ques. 5] With a fixed force, you will impart the same acceleration to a body on the earth and on the moon.
Indicate whether the statement is true or false
[Ques. 6] What is the force on the magnet that results from the motion shown in this figure?
a. Directly downward.
b. Directly upward.
c. Zero.
d. The result is a torque twisting the magnet around its length.
e. To the right.
[Ques. 7] You roll a ball off a table and at the same time drop a second ball straight down from the edge of the table. The second ball reaches the ground before the first ball.
Indicate whether the statement is true or false
[Ques. 8] Magnetic force on charged particles cause:
a. sunsets.
b. tides.
c. the aurora borealis and aurora australis.
d. changes in temperature from one season to the next.
e. the blue color of the sky.
[Ques. 9] When a car goes around a curve at twice the speed, the centripetal force on the car doubles.
Indicate whether the statement is true or false
[Ques. 10] The magnetic force on a charged particle is always:
a. perpendicular to the particle's velocity.
b. in the direction of the particle's velocity.
c. absent for moving particles.
d. parallel to the particle's velocity.
e. in the opposite direction to the particle's velocity.
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