Forces and Motion Flashcard
Flashcard
•
Science
•
9th Grade
•
Practice Problem
•
Hard
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10 questions
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1.
FLASHCARD QUESTION
Front
Force of 20N: Acceleration of 5m/s²
Force of 54N: Acceleration of 13.5m/s²
Force of 100N: Acceleration of 25m/s²
What is the MASS of the car?Back
4 kg
Answer explanation
They are all the same car.
M = F / A
So, divide any of the forces by the resulting acceleration.
M = 20 N / 5 m/s^2 = 4 kg
**remember a unit for mass is kg!!!
2.
FLASHCARD QUESTION
Front
Batman and Superman are pushing a train in opposite directions. Batman is pushing with a force of 120N, and Superman is pushing in the opposite direction with a force of 80N. What is the net force? And which way does the train move?
Back
Answer explanation
The net force is the total force acting on train. Superman's 80 N cancel out some of the force from Batman.
120 N - 80 N = 40 N <- net force on train
Because Batman is pushing away with more force, the train will move towards Superman.
3.
FLASHCARD QUESTION
Front
A car is pushed with a force of 70N, it accelerates at 40 m/s². What is the mass of the car?
Back
1.75 kg
Answer explanation
M = F / A
M = 70 N / 40 m/s^2
M = 1.75 kg
(the unit for mass is kg!)
4.
FLASHCARD QUESTION
Front
A 900 kg train accelerates from a speed of 70 m/s to 160 m/s in 2 minutes. Calculate force.
Back
675 N
Answer explanation
First find the acceleration by dividing the difference in velocity by the time in seconds. Then use the acceleration in the F=MA equation.
A = 160 m/s - 70 m/s =>
120 SECONDS
A = 90/120 = 0.75 m/s^2
F = M * A ....
F = 900 Kg x 0.75 m/s^2 = 675 N
...remember the unit for force is N!! (newtons)
5.
FLASHCARD QUESTION
Front
Which of the following is a unit of force?
Kilogram
,Meter per second squared
,Newton
,Joule
Back
Newton
Answer explanation
Newtons (N) are a unit of FORCE.
6.
FLASHCARD QUESTION
Front
Which of the following is a unit for MASS?
Kg
,N
,cm
,mL
Back
Kg
Answer explanation
KiloGrams are a unit of MASS.
7.
FLASHCARD QUESTION
Front
Two equal and opposite forces of 6.0 N act on an object. What is the unbalanced force on the object?
Back
0 N
Answer explanation
if the forces are equal, the net force is 0 N
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