Forces & Motion: Inertia and Friction


AsterQuiz Forces & Motion: Inertia and FrictionVersion en ligne Newton’s First Law quiz par Bushra Darmaa09 1 What does Newton's first law state about an object at rest or in motion? a An object needs a force to keep moving at constant speed b An object stays at rest or moves with constant velocity unless acted on by a net external force c Friction always stops motion immediately 2 Inertia is the tendency of an object to do what? a Stop instantaneously when pushed b Resist changes in its motion c Accelerate when a force is applied 3 What are balanced forces? a A single force acting on an object b Two or more forces that produce a net force of zero c Forces that always cause acceleration 4 What are unbalanced forces? a Forces that produce a net force, causing acceleration b Forces balanced to zero acceleration c Forces that sum to zero only on rubber balls 5 Which type of friction acts when surfaces slide past each other? a Gravitational friction b Kinetic (sliding) friction c Static friction 6 If you push a book with 2 N and friction is 1 N, what is the net force? a -1 N b 1 N in the push direction c 2 N 7 A parked car stays parked until what happens? a Air resistance freezes it in place b Friction stops it automatically c A net external force acts on it 8 If two equal forces push a object in opposite directions, the net force is? a Zero (balanced forces) b Equal to one of the forces c Double the force 9 Which factors affect friction between two surfaces? a Surface roughness and material interaction b Surface area of contact and weight only c Volume and color 10 Which daily example demonstrates Newton's first law? a A rocket launching spontaneously b A car accelerating without a driver c A ball at rest stays at rest until kicked 11 1) What does Newton's First Law state about an object at rest or in motion? Source: Newton's Laws PPT. a Forces always cause motion changes immediately regardless of motion state. b An object at rest stays at rest and an object in motion stays in motion unless acted on by a net external force. c An object changes its motion unless an external force changes it. 12 2) How is inertia related to mass? Source: Newton's 1st Law content. a Less mass means greater inertia. b More mass means greater inertia, i.e., greater resistance to changes in motion. c Inertia is independent of mass. 13 3) What is the formula that relates force, mass, and acceleration? Source: Newton's 2nd Law PPT. a F = m × a b a = F × m c F = a ÷ m 14 4) Which statement describes Newton's 1st Law in terms of a net force? Source: Newton's 1st Law content. a Only gravity can change motion. b A nonzero net force is required to change an object's motion from its current state. c Any single force changes motion immediately. 15 5) If an object's mass doubles but the same net force acts, what happens to its acceleration? Source: 2nd Law concept. a Acceleration stays the same. b Acceleration halves. c Acceleration doubles. 16 6) A 0.6 kg soccer ball experiences a net force of 18 N. What is its acceleration? Source: 2nd Law practice. a 3 m/s² b 180 m/s² c 30 m/s² 17 7) A 20 kg cart accelerates at 2.5 m/s². What net force acts on it? Source: 2nd Law example. a 5 N b 100 N c 50 N 18 8) In Newton's 2nd Law, which unit is used for force? Source: 2nd Law definitions. a Joules (J) b Pascals (Pa) c Newtons (N) 19 9) True or false: The net force on an object determines its direction of acceleration. Source: 2nd Law concept. a True b Only for horizontal motion c False 20 10) A 2,500 kg truck decelerates at 2 m/s². Net braking force magnitude is: Source: 2nd Law and practice. a 2,500 N b 1,250 N c 5,000 N

1

What does Newton's first law state about an object at rest or in motion?

a

An object needs a force to keep moving at constant speed

b

An object stays at rest or moves with constant velocity unless acted on by a net external force

c

Friction always stops motion immediately

2

Inertia is the tendency of an object to do what?

a

Stop instantaneously when pushed

b

Resist changes in its motion

c

Accelerate when a force is applied

3

What are balanced forces?

a

A single force acting on an object

b

Two or more forces that produce a net force of zero

c

Forces that always cause acceleration

4

What are unbalanced forces?

a

Forces that produce a net force, causing acceleration

b

Forces balanced to zero acceleration

c

Forces that sum to zero only on rubber balls

5

Which type of friction acts when surfaces slide past each other?

a

Gravitational friction

b

Kinetic (sliding) friction

c

Static friction

6

If you push a book with 2 N and friction is 1 N, what is the net force?

a

-1 N

b

1 N in the push direction

c

2 N

7

A parked car stays parked until what happens?

a

Air resistance freezes it in place

b

Friction stops it automatically

c

A net external force acts on it

8

If two equal forces push a object in opposite directions, the net force is?

a

Zero (balanced forces)

b

Equal to one of the forces

c

Double the force

9

Which factors affect friction between two surfaces?

a

Surface roughness and material interaction

b

Surface area of contact and weight only

c

Volume and color

10

Which daily example demonstrates Newton's first law?

a

A rocket launching spontaneously

b

A car accelerating without a driver

c

A ball at rest stays at rest until kicked

11

1) What does Newton's First Law state about an object at rest or in motion? Source: Newton's Laws PPT.

a

Forces always cause motion changes immediately regardless of motion state.

b

An object at rest stays at rest and an object in motion stays in motion unless acted on by a net external force.

c

An object changes its motion unless an external force changes it.

12

2) How is inertia related to mass? Source: Newton's 1st Law content.

a

Less mass means greater inertia.

b

More mass means greater inertia, i.e., greater resistance to changes in motion.

c

Inertia is independent of mass.

13

3) What is the formula that relates force, mass, and acceleration? Source: Newton's 2nd Law PPT.

a

F = m × a

b

a = F × m

c

F = a ÷ m

14

4) Which statement describes Newton's 1st Law in terms of a net force? Source: Newton's 1st Law content.

a

Only gravity can change motion.

b

A nonzero net force is required to change an object's motion from its current state.

c

Any single force changes motion immediately.

15

5) If an object's mass doubles but the same net force acts, what happens to its acceleration? Source: 2nd Law concept.

a

Acceleration stays the same.

b

Acceleration halves.

c

Acceleration doubles.

16

6) A 0.6 kg soccer ball experiences a net force of 18 N. What is its acceleration? Source: 2nd Law practice.

a

3 m/s²

b

180 m/s²

c

30 m/s²

17

7) A 20 kg cart accelerates at 2.5 m/s². What net force acts on it? Source: 2nd Law example.

a

5 N

b

100 N

c

50 N

18

8) In Newton's 2nd Law, which unit is used for force? Source: 2nd Law definitions.

a

Joules (J)

b

Pascals (Pa)

c

Newtons (N)

19

9) True or false: The net force on an object determines its direction of acceleration. Source: 2nd Law concept.

a

True

b

Only for horizontal motion

c

False

20

10) A 2,500 kg truck decelerates at 2 m/s². Net braking force magnitude is: Source: 2nd Law and practice.

a

2,500 N

b

1,250 N

c

5,000 N

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