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Science, Physics, Mathematics
8th
grade
Physics Calculations Assignment
52 questions
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- 1. Multiple ChoiceTo calculate average speed you _______ the distance traveled by the elapsed time.dividemultiplysquaresubtract
- 2. Multiple ChoiceThe formula for speed is: Speed= Distance/Time
To work it out you need to...Add the distance and timeMultiply the distance and timedivide distance and timesubtract distance and time - 3. Multiple Choice
A train travels 25 km in 5 hrs. How fast is the train going?
25 miles/hr
5 km/hr
5 m/s
50 km/hr
- 4. Multiple ChoiceA worm traveled 50 centimeters in 5 minutes. What is the average speed of the snail?10 cm/m25 cm/m250 cm/m1 cm/m
- 5. Multiple ChoiceCar #1 that traveled 160 kilometers in 5 hours, and Car #2 traveled 140 kilometers in the same time. Which car traveled faster?Car #1Car #2Their speeds are equal.
- 6. Multiple ChoiceWhat is this graph representing?Constant SpeedAcceleration (speeding up)Deceleration (slowing down)No motion
- 7. Multiple ChoiceWhat two measurements are necessary for calculating speed?Mass and timeTemperature and massMass and distanceDistance and time
- 8. Multiple ChoiceAt 60 seconds, how far had this object traveled?0 m10 m20 m40 m
- 9. Multiple ChoiceHow long did it take this object to travel 10 m?0 s10 s15 s20 s
- 10. Multiple ChoiceWhat is happening in this graph from point B to C?The object is going down a hill.The object is returning to its starting location.The object is slowing down.The object is staying still.
- 11. Multiple ChoiceWhat is happening in this graph from point A to B?The object is accelerating.The object is not moving.The object is decelerating.The object is moving at a constant speed.
- 12. Multiple Choice
6 m/s2
-6 m/s2
150 m/s2
0.17 m/s2
- 13. Multiple Choice
20 m/s2
-20 m/s2
33.3 m/s2
4 m/s
- 14. Multiple Choice
-5 m/s2
5 m/s2
0.2 m/s2
200 m/s2
- 15. Multiple Choice
-10 m/s2
10 m/s2
6 m/s2
-10 m/s
- 16. Multiple Choice
Force is a -
push or pull
only a push
only a pull
none of the above
- 17. Multiple ChoiceHow much force is needed to accelerate a 3kg skateboard at 5m/s2.8N1.6N0.6N15N
- 18. Multiple ChoiceHow much force is needed to accelerate a 25kg bowling ball at 2m/s2.50N5N12.5N100N
- 19. Multiple ChoiceNewton's law of motion describes the relationship of force, mass, and acceleration. Write the equation.M=F/AF=MAA= F/MAll of the above
- 20. Multiple ChoiceWhich is an unbalance force?A book sitting on a desk.A ball moving in a constant speed in the same direction.While doing a mannequin challenge Jose suddenly falls over when a bug lands on his nose.Every student in class is sitting perfectly still at their desks.
- 21. Multiple ChoiceIs it BALANCED?YesNo
- 22. Multiple ChoiceWhat is the unit for FORCE?N (Newtons)lbs (pounds)g (grams)m/s (meters per second)
- 23. Multiple ChoiceCalculate the net force of the object in the image shown.20N35N5N25N
- 24. Fill in the Blank
An object with a mass of 10 kg is accelerated upward at 2 m/s2. What force is required? ____ Newtons
- 25. Multiple ChoiceWhat is the net force?5000 N right4000 N right40 N left4000 N left
- 26. Multiple Choice45 m/s2 is the...MassForceAccelerationweight
- 27. Multiple Choice
Which of the following is the formula for momentum?
p = mv
M = mv
F = ma
g = mc2
- 28. Multiple Choice
Which of the following is the unit for momentum?
kg·m/s
kg·m
kg·m/s2
Momentum has no unit.
- 29. Multiple Choice
Calculate the momentum of a 55-kg running back moving westward at 10 m/s.
550 kg·m/s, west
550 kg·m/s
550 m/s, west
550 kg, west
- 30. Multiple Choice
Calculate the momentum of a 1200-kg truck moving northward at 30 m/s.
36000 kg·m/s, north
400 kg·m/s, north
36000 kg·m/s
400 kg·m/s
- 31. Multiple Choice
With what velocity must a 0.48-kg softball be moving to equal the momentum of a 0.29-kg baseball moving at 23 m/s?
13.9 m/s
10.8 m/s
16.7 m/s
12.0 m/s
- 32. Multiple Choice
Newtons are the correct unit for which of the following?
Force
Work
Power
Acceleration
- 33. Multiple Choice
How do we calculate work?
W = F * d
w = f / d
- 34. Multiple Choice
Which is the correct unit for work?
Joules
Newton
meter
Watts
- 35. Multiple ChoiceThe rate at which work is done.JoulesPowerWattsNewtons
- 36. Multiple ChoiceHow do you calculate power?P = W/tP = E/tP = w * tP = bbq/chicken
- 37. Multiple Choice
What is the correct unit for power?
Watt
Joules
Newtons
seconds
- 38. Multiple Choice
It took 500 Newtons of force to push a car four meters. How much work was done?
2000 J
125 J
0.008 J
500 J
- 39. Multiple Choice1. A book weighing 1.0 newton is lifted 2 meters. How much work was done?2 J0.5 J
- 40. Multiple Choice
What is the power of a kitchen blender if it can perform 3,750 Joules of work in 15 seconds?
250 W
0.004 W
56,250 W
25 W
- 41. Multiple Choice
How much power is used if a force of 35 Newtons is used to push a box a distance of 10 meters in five seconds? (Hint: Solve for work first. This is a 2-step problem.)
70 W
3.5 W
7 W
350 J
- 42. Multiple ChoiceA set of pulleys is used to lift a piano weighing 1,000 newtons. The piano lifted 3 meters in 60 seconds How much power is used?16.67 watts50 watts
- 43. Multiple Choice
What is effort (input) force?
the force one exerts on a machine
the force which an effort force must overcome in order to do work on an object via a simple machine.
the force the machine exerts on a object
the output work times the input distance
- 44. Multiple ChoiceIf the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?2N5N10N15N
- 45. Multiple Choice
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever (MA=Output Force/Input Force)?
1
10
100
1000
- 46. Multiple Choiceif a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?120 N5 N2000 N80 N
- 47. Multiple Choice
The mechanical advantage of this inclined plane is...(MA=Resistance Force/Effort Force)
2.4
3.4
4.4
- 48. Multiple ChoiceThe law of conservation of energy states that when one form of energy is converted into another,energy is destroyed in the processno energy is destroyed in the processenergy is created in the processsome amount of energy cannot be accounted for
- 49. Multiple Choice
Efficiency is calculated by useful energy output divided by total energy input, expressed as a percentage
False
True
- 50. Fill in the Blank
An electric motor is used to raise an object. The object's gravitational potential energy store increases by 60J when the motor is supplied with 200J of energy by an electric current. Calculate the percentage efficiency of the motor.
- 51. Multiple Choice
Calculate the efficiency of the TV.
60%
56%
4%
39%
- 52. Multiple Choice
A power station needs an input of 188 J each second to operate a single 60 W lamp in a house. The Sankey diagram shows what happens to the input energy at each stage. Calculate the overall efficiency from power station input to lamp.
2.6 %
0.80 %
2.5 %
0.0080 %
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