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Physics 9 Chapter 3 - Dynamics - 6
1.
With which situation, the first law of motion deals?
a) The reaction of bodies when a force acts on it
b) Both b and c
c) When a net force is acting on a body
d) When the bodies are at rest
2.
With which situation, the first law of motion deals?
a) When the bodies are moving with uniform speed
b) The reaction of bodies when a force acts on it
c) When a net force is acting on a body
d) None of these
3.
A body at rest remains at rest provided no .........acts on it?
a) Initial force
b) Momentum force
c) Final force
d) Net force
4.
According to Newton’s .........law of motion, a body at rest remains at rest provided no net force acts on it?
a) Third
b) First
c) Second
d) Fourth
5.
Objectsddonnotmmovebbytthemselvesuunlessssomeone...............them?
a) Moves
b) Listens
c) Watches
d) Heats
6.
A book lying on a table remains at rest as long as no ............acts on it?
a) Momentum force
b) Final force
c) Net force
d) Initial force
7.
Newton’s first law of motion is valid only in the absence of...........?
a) Momentum
b) Net force
c) Friction
d) Force
8.
A ball rolled on a rough ground stops earlier than that rolled on a smooth ground. Why?
a) Because rough surfaces offer less friction
b) Because rough surfaces offer great friction
c) None of these
d) Because smooth surfaces offer great friction
9.
A ball rolled on a rough ground stops earlier than that rolled on a smooth ground. Why?
a) Because smooth surfaces offer great friction
b) Because rough surfaces offer less friction
c) Because smooth surfaces offer less friction
d) None of these
10.
Who presented the laws of motion?
a) Galileo
b) Wohler
c) Newton
d) Einstein
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