Download G10-LC4-Q1-Answer Key

Quiz
Grade 10
Physics
Name: _____Answer Key__________
Grade ( ) ____ / 20
Score:
Date:
Section: _______
Core Physics Quiz ( ) LC
I-Choose the best answer:
/
/ 2011
ID: ___________
Chapter ( ), Section
( ) 15 minutes
Duration:
[12 marks, 2 each]
1. Gravity is a __________ force.
A. thrust
B. contact
C. field
D. normal
2. The net force is the __________.
A. friction between any two objects
B. force exerted on one surface by another when there is no relative
motion between the two
C. vector sum of two or more forces on an object
D. apparent weight
3. An object that has a force exerted on it is called __________.
A. External world.
B. System.
C. Agent.
D. Static.
4. Newton's first law of motion states that __________.
A. all forces come in pairs
B. objects remain either at rest or continue moving in a straight
line with constant speed only if the net force on that object is
zero
C. the acceleration of an object is proportional to the net force exerted
on the object and can be stated as the equation a = Fnet/m.
D. air does not exert a force.
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5. The newton is equivalent to _________.
A. Kg.m/s2
B. m/s2 .Kg
C. Kg.s2 /m
D. s2/Kg.m
6. An object is in equilibrium when __________.
A. the equilibrant is zero
B. three or more forces act on it
C. its acceleration is constant
D. the net force on it is zero
---------------------------------------------------------------------------------II- Answer the following question:
[ 4 marks, 2 each]
8.
In the drawing below, use arrows to show the two horizontal and two vertical forces acting on the
boat as it is pulled to the shore at a constant speed. Is there a net force on the boat? Explain.
Answer
No, there is no net force on the boat
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because it has neither vertical nor horizontal acceleration. There is, however, constant
forward
motion because the force of tension is greater than the force of friction.
-------------------------------------------------------------------------------------------------------------------III – Solve the following problem:
[2 marks]
9. An object was accelerated at a rate of 5 m/s2 by applying a force of 100 N. What is the mass of the object?
m = F/g = 100N / 5 m/s2 = 20 Kg
--------------------------------------------------------------------------------------------
IV-: Writing skills questions:
[2 marks]
10. State Newton’s second law of motion.
The acceleration of an object is proportional to the net force and inversely
proportional to the mass of the object being accelerated.
11. What is meant by inertia?
It is the tendency of an object to resist change.
GOOD
LUCK
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