Deck 17: Momentum and Collisions

Question 1

To replace a ball with another ball by collision, a snooker player must consider the condition that

A)the collision must be head on
B)The moving ball must not be given any spin
C)both A and B
D)no conditions required

Answer 1

both A and B

Question 2

Direction of momentum is direction of object's

A)mass
B)acceleration
C)velocity
D)frictional force

Answer 2

velocity

Question 3

In a springy collision, if the fast moving trolley collides with a slow one, then the fast one will bounce back at speed of

A)slow one
B)less than slow one
C)more than slow one
D)with the same speed as before

Answer 3

slow one

Question 4

An object travelling with constant velocity has

A)constant momentum
B)zero momentum
C)increasing momentum
D)decreasing momentum

Question 5

If a trolley collides with a stationary trolley of double mass, then they move off with

A)half of the original velocity
B)one third of original velocity
C)double the original velocity
D)triple the original velocity

Question 6

In a perfectly elastic collision, momentum and energy are

A)not conserved
B)conserved
C)becomes zero after collision
D)equal before collision

Question 7

Mass and velocity are combined to give

A)angular momentum
B)equilibrium
C)acceleration
D)linear momentum

Question 8

If the total kinetic energy and momentum of a system becomes zero after collision, then the collision is

A)elastic
B)inelastic
C)conserved
D)not conserved

Question 9

Momentum of two objects moving with same speed but in opposite direction upon collision is

A)increased
B)decreased
C)is zero
D)is infinite

Question 10

Forces on interacting bodies are

A)equal
B)opposite
C)both A and B
D)parallel

Question 11

Resultant force acting on object and rate of change of linear momentum are

A)inversely related
B)not related at all
C)directly related
D)directly proportional

Question 12

In a perfectly elastic collision, the relative speed of approach and relative speed of separation are

A)equal
B)in equal
C)zero
D)infinite

Question 13

{{}} A white ball of mass 1.0 kg moving with initial speed u = 0.5 m s^-1 collides with stationary red ball of same mass, they move forward making angle of 90° between their paths. Their speed is

A)1 m s^-1
B)0.354 m s^-1
C)2 m s^-1
D)3 m s^-1

Question 14

In fireworks the momentum provided by chemicals is directed

A)upwards
B)left side
C)right side
D)downwards

Question 15

Total momentum within a closed system is

A)increasing
B)decreasing
C)zero
D)constant

Question 16

Average force acting on 900 kg car if it's velocity ranges from 5 m s^-1 to 30 m s^-1 in 12 s is {{}}

A)1875 N
B)2000 N
C)3000 N
D)1560 N

Question 17

Interaction that causes an object's momentum to change is

A)velocity
B)acceleration
C)power
D)force

Question 18

Momentum possessed by spinning objects is called

A)linear momentum
B)angular momentum
C)normal momentum
D)degrees' momentum

Question 19

In a perfectly inelastic collision, kinetic energy

A)totally disappears
B)is increased
C)is decreased
D)is unchanged

Question 20

Contact force always acts at

A)acute angles to the surface producing it
B)right angles to the surface producing it
C)obtuse angle to the surface producing it
D)parallel to the surface producing it

Question 21

Combinations of base units are

A)simple units
B)derived units
C)scalars
D)vectors

Question 22

Two forces which make up Newton's third law can

A)act on same objects
B)act on different objects
C)not act at same time
D)not act oppositely

Question 23

Rate of falling object in vacuum is

A)independent of weight
B)dependent on mass
C)independent of mass
D)dependent of weight

Question 24

At terminal velocity the

A)air resistance and weight are equal
B)air resistance is less than weight
C)weight is more than air resistance
D)air resistance is more than weight

Question 25

Vehicle will accelerate as long as

A)air resistance is greater than thrust
B)air resistance is greater than inertia
C)thrust is greater than air resistance and friction
D)friction is greater than thrust