Physics 30 Unit A and B

The difference between a car hitting a wall vs. a car hitting a hay stack is

• the Impulse on the car hitting the wall is greater
• the change in momentum of the car hitting the wall is greater
• the force on the car hitting the hay stack is greater
• the collision time of the car hitting the hay stack is greater

Momentum is conserved in this type of collision

• elastic
• inelastic
• momentum is conserved in both types of collisions

When the speed of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.
• doubles
• quadruples
• decreases

A big fish swims upon and swallows a small fish at rest. After lunch, the big fish has less

• momentum
• velocity
• mass

An 1 kg object moving to the right at 2 m/s collides inelastically with a 1 kg object moving to the left at 2 m/s. The final velocity of both objects will be 

• 0 m/s
• 1 m/s
• 2 m/s
• 4 m/s

Cart A is pulled with a 2 Newton force for 2 seconds, and Cart B is pulled with a 1 Newton force for 3 seconds.  Which cart experiences the greatest impulse?

• Cart B
• Cart A
• they are the same

An atom loses an electron.  What type of charge does it have now?

• positive
• negative

What direction are the electric field lines around an electron?

• towards the charge
• away from the charge

Charged objects are not attracted to neutral objects

• True
• False

When a balloon is rubbed on clothes it acquires a charge by ___________

• Induction
• reduction
• friction 
• concuction