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1.3 Momentum
Question Paper
Course Edexcel IGCSE Physics
Section 1. Forces & Motion
Topic 1.3 Momentum
Difficulty Easy
Time allowed: 50
Score: /34
Percentage: /100
Page 1 of 10
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Question 1a
(a)
Which row shows the correct definition for momentum and its unit?
(1)
definition unit
A. m
v= Ns
p
B. p
v= kg m/s
m
C. m
p= N/kg
v
D. v
p= kg m/s2
m
[1 mark]
Question 1b
(b)
Which of the following correctly shows the relationship between force, change in momentum and time?
(1)
( mv − mu )
A. ∆ p =
∆t
B. F ∆ t = ∆ p
C. F = ( mv − mu ) ∆ t
∆F
D. p =
∆t
[1 mark]
Question 1c
(c)
Circle the correct words in the following sentences:
Momentum is a scalar / vector quantity because it has magnitude only / magnitude and direction
In a closed system, the total momentum before a collision is greater than / less than / equal to the total momentum
after the event
(2)
Page 2 of 10
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[2 marks]
Question 2a
Some quantities are vectors, others are scalars.
(a)
Complete the table by ticking the boxes to show which quantities are vectors and which are scalars.
One has been done for you.
(2)
Quantity Vector Scalar
distance
force
momentum ✓
speed
velocity
[2 marks]
Question 2b
(b)
A truck travels at 20 m/s.
The mass of the truck is 15 000 kg.
(i)
State the equation linking momentum, mass and velocity.
(1)
(ii)
Calculate the momentum of the truck.
(2)
momentum = .......................... kg m/s
Page 3 of 10
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[3 marks]
Question 2c
The diagram shows the force of the road on one of the tyres of the truck.
(c)
The magnitude of this force is 53 000 N.
(i)
State Newton's Third Law.
(1)
(ii)
Draw an arrow on the diagram to show the other force in this Newton's Third Law force pair, and state the value of this force.
(3)
[3 marks]
Page 4 of 10
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Question 3a
(a)
Four students draw a Newton's Third Law force pair for a book on a table.
Which student's Newton's Third Law force pair is correct?
(1)
[1 mark]
Page 5 of 10
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Question 3b
(b)
Complete the sentences to explain how a Newton's Third Law force pair on the foot and the ground is responsible for the
motion of walking:
When a person walks on the ground, there is a force from the ..................... which pushes the ..................... backward.
From Newton's Third Law, there is an ..................... and ..................... force from the ..................... on the ..................... which
pushes the foot forward.
(3)
[3 marks]
Question 4a
(a)
Airbags are one of the many safety devices used in cars to protect the driver if there is a crash.
Airbags protect the driver by
A. increasing the force acting on the driver
B. increasing the rate of change of momentum of the crash
C. increasing the time taken for the driver to stop
D. decreasing the time taken for the driver to stop
[1 mark]
Question 4b
(b)
A driver has a mass of 67 kg and drives at a velocity of 15 m/s.
(i)
State the formula linking momentum, mass and velocity.
(1)
(ii)
Calculate the momentum of the driver.
(2)
Page 6 of 10
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[3 marks]
Question 4c
(c)
The car is involved in a crash. The driver is wearing a seatbelt and comes to rest in 0.36 s.
(i)
State the equation linking force, change in momentum and time.
(1)
(ii)
Show that the force on the driver is about 2800 N.
(2)
[3 marks]
Question 4d
A passenger with the same mass as the driver is also in the car at the time of the crash.
They were not wearing a seatbelt and experienced an impact force that was 5 times greater than the force experienced by
the driver.
(d)
Calculate the time taken by the passenger to come to a stop.
(3)
time taken = .............................................................. s
[3 marks]
Page 7 of 10
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Question 5a
The principle of conservation of momentum applies when two objects collide.
(a)
State the principle of conservation of momentum.
(2)
[2 marks]
Page 8 of 10
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Question 5b
A student is investigating conservation of momentum using an air track and two gliders, A and B, which both have magnets
attached, as shown in the diagram.
(b)
Initially, glider A has a momentum of 0.50 kg m/s and moves towards glider B, which is at rest. The gliders collide and the
magnets cause them to move in opposite directions.
Both gliders are identical and each has a mass of 0.250 kg.
(i)
State and explain whether the poles of the magnets are opposite or alike.
(2)
(ii)
State the total momentum of glider A and glider B after the collision.
(1)
(iii)
Calculate the velocity of glider A before the collision.
(2)
velocity of glider A = ............................................... m/s
[5 marks]
Page 9 of 10
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Question 5c
(c)
What is the velocity of glider B after the collision?
A. 1 m/s
B. 2 m/s
C. 3 m/s
D. 4 m/s
[1 mark]
Page 10 of 10
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