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WorksheetsCH 6 Review
Total questions: 38
Worksheet time: 38mins
A 1000 kg truck moving at 10 m/s runs into a concrete wall. It takes 0.1 seconds for the truck to completely stop. What is the magnitude of the force exerted on the truck during the collision in Newtons? (Ft=mv)
(a)
What causes a ship carrying heavy cargo to take more time to come to a stop than an identical ship carrying lighter cargo if both ships are traveling at the same speed?
(a)
What does the mechanical energy of a system include?
(a)
What is the approximate momentum in kgm/s of a car with a mass of 1.20 × 103 kg and a velocity of 45.0 km/h? (p=mv) hint: km/h to m/s , 1km=1000m and 1h=3600s
(a)
A 1200 kg car accelerates from 0 m/s to 5.0 m/s in 5.0 s. What is the magnitude of the car’s final momentum in kgm/s? (p=mv)
(a)
Which of the things listed has a momentum nearest that of a 0.145 kg baseball moving at a velocity of 29 m/s? (p=mv)
(a)
A 1000-kilogram car was traveling north at a constant 15 m/s velocity of Over 10 seconds, the velocity of the car increased to 20 m/s in the same direction. Which statement describes the change in motion of the car during the 10-second period?
Unbalanced forces cause the car’s momentum to increase by 5000 kgm/s
Acceleration increases the car’s speed by 5 m/s while its momentum stays constant.
An increase in momentum causes the car’s acceleration to increase to 20000m/s2
Balanced forces cause the car’s velocity to increase by 5 m/s in 10 s while the momentum changes by 5000 kgm/s.
In a study of momentum during collisions, a student threw an egg at a large sheet of cloth that
was suspended from a line and observed that the egg did not break during the collision. A
second egg, thrown with similar force at a suspended concrete block, did break on impact. Why
did the first egg survive the collision while the second egg did not survive?
The egg that hit the cloth sheet had a larger change in momentum.
The egg that hit the cloth sheet had a smaller change in momentum.
The collision of the egg and the cloth sheet had a shorter duration and higher force.
The collision of the egg and the cloth sheet had a longer duration and lower force.
A lab group is developing a device to minimize the force on eggs dropped from a height of 2.0
meters. In their first test, they place four eggs in a small cardboard box and then wrap the box
with a layer of plastic bubble wrap. When they open the box, the students find that all four
eggs had cracked. Which of these changes is most likely to reduce the breaking of the eggs in
the next test?
Add a second layer of bubble wrap around the box.
Use a wooden box instead of a cardboard box.
Separate the eggs with bubble wrap inside the box
Wrap each egg in metal foil before placing it inside the box.
How does a parachute protect a skydiver from serious injury during a jump?
The parachute reduces the force of landing by absorbing energy from the skydiver.
The parachute reduces air resistance and other forces on the skydiver during the fall.
The parachute spreads the force of the landing over a larger area and reduces the effect of the collision on the body.
The parachute transfers energy from the skydiver to the atmosphere and reduces the force of the landing.
An automobile airbag works by decreasing the impact force as a result of ______________ the time of impact.
increasing
decreasing
A student investigates how far a marble can travel up the incline after rolling down the ramp. Without friction, what is the maximum height the marble will be able to reach on the incline?
(a)
Emily is riding her bicycle. Which best explains why only some of the energy used to pedal her bicycle is transferred into forward motion of the bicycle?
The energy of the bicycle tire is applied in a circular motion.
The energy of the bicycle is transferred to only one wheel.
The gears and chain of the bicycle are covered with oil.
The gears and chain of the bicycle generate friction.
A school bus uses petroleum as chemical potential energy. This energy is transferred through the engine, which in turn moves the bus. The movement of the bus is an example of what type of energy?
(a)
A 12-g ball moving 6 m/s collides head on and inelastically with a second 12-g ball initially at rest. After colliding, the balls move together at the speed of (a) m/s.
A 6-kg ball with an initial speed 5 m/s of sticks to a wall after colliding with the wall. How much kinetic energy in Joules is lost during the collision?
(a)
The diagram shows the elastic collision between the moving sphere, sphere 1, and the static sphere, sphere 2.
What is the velocity in m/s of sphere 2 after the collision?
(a)
A roller coaster begins at rest 120 m above the ground, as shown. Assume no friction from the wheels and air, and that no energy is lost to heat, sound, and so on. The radius of the loop is 40 m. Find the speed of the roller coaster at points E and F.
Note:- Use g=10 m/s^2.
E=40 m/s
F=49 m/s
E=52 m/s
F=38 m/s
E=37 m/s
F=41 m/s
E=25 m/s
F=32 m/s
A skier starts from rest at the top of a 50.0 m hill, coasts down a 20∘ slope into a valley and continues up to the top of a 40.0 m hill. Both hill heights are measured from the valley floor. Assume the skier puts no effort into the motion (they always coast) and there is no friction. How fast will the skier be moving on the valley floor between the two hills?
(a)
A skier starts from rest at the top of a 50.0 m hill, coasts down a 20∘ slope into a valley and continues up to the top of a 40.0 m hill. Both hill heights are measured from the valley floor. Assume the skier puts no effort into the motion (they always coast) and there is no friction. How fast will the skier be moving at the peak of the second hill?
(a)
At which position is the roller coaster car's mechanical energy 100% potential energy?
A
B
C
D
At which position is the roller coaster car's mechanical energy 100% kinetic energy?
A
B
C
D
At which position is the roller coaster car's kinetic energy increasing?
A
B
C
D
What are the units for Work?
Newtons
Kilograms
Joules
Moles
A runner has a momentum of 670 kg m/s and is traveling at a velocity of 9.0 m/s. What is his mass? (a) kg
An object with a mass of 2000 kg at rest has what momentum?
(a)
A small car with a mass of 800. kg is moving with a velocity of 27.0 m/s.
What is the momentum of the car?
(a)
Match the following
momentum
p=mv
impulse
Ft
Change in velocity
Δv
momentum and velocity
vectors
Ns are equivalent to
kgm/s
Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:
(a)
A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is (a) N s.
Imagine a 2.0 kg blue pool ball moving at 8.0 m/s collides with a 1.5 kg green pool ball initially at rest. After the collision, the blue pool ball continues in the same direction with a velocity of 4.0 m/s. Neglecting friction, find the velocity of the green ball after the collision.
(a)
Which of these has the most potential energy?
What is potential energy?
The stored energy of an object due to its position or condition.
The energy that an object has due to its motion.
The energy an object has due to its speed.
The energy an object has due to its volume.
What is kinetic energy?
The stored energy of an object due to its position or condition.
The energy that an object has due to its motion.
The energy an object has due to its speed.
The energy an object has due to its volume.
Where would this tossed baseball have the least amount of kinetic energy?
point W
point X
point y
point z
Where would this tossed baseball have the greatest amount of kinetic energy?
point W
point X
point y
point z
