Free Printable Topic 3: Dynamics of liner motion

1.

Momentum is defined as the product of mass, m and the

a)

Impulse, J

b)

Acceleration, a

c)

Velocity, v

d)

Distance, s

2.

The units of Impulse is

a)

N/s

b)

Ns

c)

N

d)

m/s

3.

Impulse =

a)

Shaded area under F-t graph

b)

Area of shaded region

c)

Shaded area under a-t graph

d)

None of these

4.

The equation to calculate momentum is

a)

p = 1/2 mv²

b)

p = mgh

c)

p = mg

d)

p = mv

5.

The law of conservation of momentum states that,

a)

p before is less than p after

b)

p before is the same as p after

c)

p before is more than p after

6.

What is a system called when there is no external force on it?

a)

integral

b)

unified

c)

isolated

d)

closed

7.

The impulse-momentum theorem states that

a)

the impulse on an object is equal to the change in momentum it causes

b)

the force on a moving object is equal to the magnitude of the impulse.

c)

the impulse on an object is greater than the change in momentum it causes

d)

the impulse on an object is less than the change in momentum it causes

8.

The impulse is ______ the change in momentum

a)

greater than

b)

equal to

c)

less than

d)

always double

9.

A mass has a momentum of 50 kg*m/s, when its velocity doubles what happens to its momentum?

a)

The momentum doubles.

b)

The momentum quadruples.

c)

The momentum is halved.

d)

The momentum stays the same.

10.

An 1 kg object moving to the right at 2 m/s collides inelastically with a 1 kg object moving to the left at 2 m/s. The final velocity of both objects will be

a)

0 m/s

b)

1 m/s

c)

2 m/s

d)

4 m/s

11.

The area under the curve on a Force versus time ( F vs t) graph represents

a)

Impulse

b)

Momentum

c)

Work

d)

Kinetic energy

12.

In an elastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy?

a)

Kinetic energy is also conserved

b)

Kinetic energy is gained

c)

Kinetic energy is lost

d)

None of the above

13.

Change in momentum is called:

a)

Force

b)

Impulse

c)

Acceleration

d)

Torque

14.

If a momentum of a ball is doubled, then the kinetic energy is

a)

0.5 times larger

b)

2 times larger

c)

3 times larger

d)

4 times larger

15.

Two objects collide and stick together. Kinetic energy

a)

Is definitely conserved.

b)

Is definitely not conserved.

c)

Is conserved only if the collision is elastic.

d)

Is conserved only if the environment is friction less

16.

When is kinetic energy conserved?

a)

In elastic collisions

b)

In inelastic collisions

c)

In any collision in which the objects do not stick together

d)

In all collisions

17.

The physical quantity “impulse” has the same dimensions as that of:

a)

Force

b)

Power

c)

Momentum

d)

Energy

18.

An inelastic collision is one in which:

a)

Momentum is not conserved but kinetic energy is conserved

b)

Total mass is not conserved but momentum is conserved

c)

Neither kinetic energy nor momentum is conserved

d)

Momentum is conserved but kinetic energy is not conserved

19.

Which one of the following statements concerning momentum is true?

a)

Momentum is a force

b)

Momentum is a scalar quantity.

c)

Momentum and impulse are measured in the same units

d)

The momentum of an object is always positive.

20.

Two objects constitute an isolated system. In an inelastic collision between the two objects, which one of the following statements is a false statement?

a)

The total kinetic energy is conserved.

b)

The kinetic energy of each object is not the same before and after the collision

c)

The total momentum is conserved.

d)

The magnitude of the force exerted by each object on the other object is equal

21.

Two objects constitute an isolated system. In an elastic collision between the two objects, which one of the following statements is a false statement?

a)

The total kinetic energy is conserved

b)

The kinetic energy of each object is not the same before and after the collision.

c)

The total momentum is conserved

d)

The magnitude of the force exerted by each object on the other object is equal.

22.

What is a Free Body Diagram?

a)

Visual representation of force

b)

Visual representation of objects

c)

Visual representation of force and objects interactions

d)

Visual representation of gravity

23.

The free body diagram of four boxes are shown below. Which box is in equilibrium?

a)

b)

c)

d)

24.

Name the missing force...

a)

frictional force

b)

weight force

c)

thrust

d)

buoyant force

25.

Name the missing force....

a)

weight force

b)

normal force

c)

frictional force

d)

tension force

26.

How is a force represented in a Free Body Diagram?

a)

A straight line with an arrowhead

b)

A curved line with an arrowhead

c)

An arc with an arrowhead

d)

Multiple lines with arrowheads

27.

Which equation would accurately describe the forces on this cup of coffee?

a)

$F_n\ -\ F_g\ =\ 0$

b)

$F_n\times F_g\ =\ 0$

c)

$F_n-10F_g$

d)

$F_n-F_g\ =\ -10$

28.

Acceleration is always in the direction:

a)

Of the displacement

b)

Of the initial velocity

c)

Of the final velocity

d)

Of the net force

29.

A block of mass m is pulled at constant velocity along a rough horizontal floor by an applied force 𝑇⃗ as shown. The magnitude of the frictional force is:

a)

$T\ \cos\ \theta$

b)

$T\ \sin\ \theta$

c)

$Zero$

d)

$mg$

30.

The inertia of a body tends to cause the body to:

a)

Speed up

b)

Slow down

c)

Resist any change in motion

d)

Fall towards earth

31.

A block of mass M slides down a frictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plane on the block is

a)

$Mg$

b)

$mg\ \sin\ \theta$

c)

$mg\ \cos\ \theta$

d)

$Zero,\ Since\ the\ plane\ is\ frictionless$

32.

An object of mass m is hanging by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the string? (decelerating)

a)

less than mg

b)

exactly mg

c)

greater than mg

d)

zero

33.

An object of mass m is hanging by a string from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension in the string?

a)

Less than mg

b)

Exactly mg

c)

Greater than mg

d)

Cannot be determined without knowing the speed

34.

Two cars collide head-on. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of

a)

Newton's first law

b)

Newton's second law

c)

Newton's third law

d)

Newton's law of gravitation

35.

Inertia of an object is quantitative measure of its

a)

Volume

b)

Density

c)

Mass

d)

Temperature

36.

The acceleration of an object is inversely proportional to

a)

The net force acting on it.

b)

Its position.

c)

Its velocity.

d)

Its mass

37.

It's more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity, because

a)

The normal force is greater when the carton is at rest.

b)

$\mu_s\ <\ \mu_{\ k}$

c)

Initially, the normal force is not perpendicular to the applied force.

d)

$\mu_{s\ }>\ \mu_{\ k}$

38.

A block of mass m is pulled along a rough horizontal floor by an applied force Tn as shown. The vertical component of the force exerted on the block by the floor is:

a)

$mg$

b)

$mg\ -\ T\cos\theta$

c)

$mg\ +\ T\ \sin\ \theta$

d)

$mg\ -\ T\ \sin\ \theta$

39.

A block of mass M slides down a frictionless plane inclined at an angle q with the horizontal. The gravitational force is directed

a)

Parallel to the plane in the same direction as the movement of the block

b)

Parallel to the plane in the opposite direction as the movement of the block

c)

Perpendicular to the plane

d)

Toward the center of the Earth.

40.

A car travels east at constant velocity. The net force on the car is:

a)

East

b)

West

c)

Up

d)

Zero

Topic 3: Dynamics of liner motion

Total questions: 40

Worksheet time: 1hrs 5mins

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