1.) A large truck breaks down out on
the road, and receives a push back into town by a small car. While
the car is speeding up to get to cruising speed (pushing truck at same time),
_________________
a) the force of the car pushing against the truck is equal in amount
to that of the truck pushing back against the car.
b) the force of the car pushing against the truck is less than that
of the truck pushing back against the car.
c) the force of the car pushing against the truck is greater than that
of the truck pushing back against the car
d) the car's engine is running so it applies a force as it pushes against
the truck but the truck's engine is not running so it can't push back with
a force against the car.
e) neither the car nor the truck exert any force on the other, the
truck is pushed forward simply because it is in the way of the car.
2.) A rabbit (2 kg) must push down on the earth with a force
of _____________ so that the earth can push back with a reaction force that
allows the rabbit to jump over a water puddle in the yard.
a) 20 kg
d) 19.6 N
b) less than 19.6 N
e) more than 19.6 N
c) more than 2 kg
3.) If the speed of a bouncing ball (0.4 kg mass) is 6.4 m/s just after
it bounces off the floor, how high will it bounce before stopping and reversing
direction? Remember our in class experiment?
a. 2.09 m c. 149.5 m
b. 4.16 m d. 0.209 m
e. 0.58 m
4.) Two Olympic skaters collide during practice.
Bayul has a mass of 3.5 slugs and is standing still. Szewczenko has
a mass of 5 slugs. If Szewczenko hits Bayul at a velocity of 5 ft/s
to the left, what is the total final momentum of the two skaters as they move
off together?
a) 25 slugs ft/s to the left
b) 17.5 ft/s to the right
c) 42.5 slugs ft/s to the left
d) 250 slugs ft/s to the left
e) 50 ft/s to the right
5.) An astronaut is in outer space and needs to fix something on the outside of the ship. He exits the ship in his space suit carrying the wrench needed for the repairs. If he is separated from his ship, how could he get back to it?
a) He could "swim" through outer space kicking
his feet in direction of ship.
b) He could throw the wrench towards the ship.
c) He could kick his feet in a direction away
from the ship.
d) He could throw his wrench away from the ship.
e) None of the above
6.) A rifle is fired and a 0.030 kg bullet leaves the barrel with a speed of 425 m/s. Which of the following is FALSE.
a) The bullet travels forward with momentum,
mV = 12.75 kg m/s.
b) The rifled travels backward with momentum,
Mv = 12.75 kg m/s.
c) The rifle's total momentum before firing is
zero.
d) The total momentum of the system after firing
is 0 kg m/s.
e) The rifle and bullet system's total momentum
after firing is mV + Mv = 25.5 kg m/s.
7.) In class we did experiments on different types of collisions using 2 cars and a frictionless track. A piston between the two was released moving them in opposite directions. When Car A had half the mass of Car B, Car A moved with ________ the speed of Car B .
a. three times
b. twice
c. half
d. four times
e. one third
8.) How much power is required to lift a 50 Kg bell bar from the ground to shoulder height (1.7 m) in 0.2 seconds?
a. 833 W
b. 425 W
c. 4165 W
d. 167 W
e. 8330 W
9.) How much work must be done to accelerate a 5000 kg
boat from a speed of 0.5 m/s to 3.5 m/s?
a. 22500 J
b. 45000 J
c. 60000 J
d. 12000 J
e. 30000J