UNIT 2 TEST

What does the strength of gravity between two objects depend upon?

• Mass & distance

• Mass & weight

• Gravity & inertia

• Inertia & mass

One object’s mass is M and the weight is W1 on the Earth, the weight on planet Z is W2. If an object’s mass is two times M, how much would it weigh on planet Z, when the acceleration due to gravity on planet Z is half that on the Earth?

• 2W₁

• 2W₂

•  $\frac{W_2}{m}$  

•  $\frac{2W_2}{W_1}$ 

When placed at equal distances apart, the greatest gravitational attraction will be between two ...?

• skateboards

• bowling balls

• school buses

• motorbikes

The picture shows the magnetic field that formed was formed by 2 magnet bars, which of the following correctly describes the magnetic pole of A, B, C, and D?

• A, C is N and B, D is S

• A, D is N and B, C is S

• B, C is N and A, D is S

• B, D is N and A, C is S

A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• Directed to the right

• Directed to the left

• Equal to the magnetic field

• In the same direction as the magnetic field

What is the shape of a magnetic field around a solenoid?

• 
• 
• 
• 

Which hand rule do we use for Charged particles in the magnetic field?

• 
• 
• 
• 

What are the signs of the charges on the particles in the picture?

ANSWER EXAMPLE: a:__, b:__, c:__.

Motor Hand rule: What is each finger from Fleming's hand rule representing? 1-THUMB, 2-FOREFINGER, 3-MIDDLE FINGER

• 1- magnetic field, 2- electric current, 3- magnetic force

• 1- electric current, 2 - magnetic force, 3 - magnetic field

• 1- magnetic force, 2- magnetic field, 3 - electric current

• 1 - magnetic force, 2 - electric current, 3- magnetic field

Placed metal wire in the magnetic field as shown in the picture when released electric current into the conductor wire, in which direction will the force due to magnetic field act on this wire?

• to the left toward N

• to the right toward S

• downward

• upward