15071453
Description
Quiz by Jeffrey Piggott, updated more than 1 year ago
|
Created by Jeffrey Piggott
over 5 years ago
|
|
Question 1
Question
A box of mass 8.0 kg rests on a horizontal rough surface. A string attached to the box passes over a smooth pulley and supports a 2.0 kg mass at its other end.
When the box is released, a frictional force of 6.0 N acts on it.
What is the acceleration of the box?
Answer
-
A 1.4 m s^–2
-
B 1.7 m s^–2
-
C 2.0 m s^–2
-
2.6 m s^–2
Question 2
Question
What is the definition of the force on a body?
Answer
-
A the mass of the body multiplied by its acceleration.
-
B the power input to the body divided by its velocity.
-
C the rate of change of momentum of the body.
-
D the work done on the body divided by its displacement .
Question 3
Question
Newton’s third law of motion is often summarised as ‘Every action (force) has an equal and opposite reaction.’
A book rests on a table.
If the weight of the book is the ‘action’ force, what is the ‘reaction’ force?
Answer
-
A the pull of the book on the Earth
-
B the pull of the Earth on the book
-
C the push of the book on the table
-
D the push of the table on the book
Question 4
Question
A 0.10 kg mass is taken to Mars and then weighed on a spring balance and on a lever balance.
The acceleration due to gravity on Mars is 38% of its value on Earth.
What are the readings on the two balances on Mars? (Assume that on Earth g = 10 m s^–2.)
Image:
Q4 (binary/octet-stream)
Answer
-
A
-
B
-
C
-
D
Question 5
Question
Water is pumped through a hose-pipe at a rate of 90 kg per minute. It emerges from the hose-pipe horizontally with a speed of 20 m s^–1.
Which force is required from a person holding the hose-pipe to prevent it moving backwards?
Answer
-
A 30 N
-
B 270 N
-
C 1800 N
-
D 10 800 N
Question 6
Question
A man weighs 240 N on Mars where the acceleration of free fall g is 4 m.s^–2. On the Moon, g is 2.0 m.s^-2.
Which statement is correct?
Answer
-
A The man has a mass on Mars of 60 N.
-
B The man has a mass on the Moon of 120 kg.
-
C The man weighs 120 N on the Moon.
-
D The man weighs 240 N on the Moon.
Want to create your own Quizzes for free with GoConqr? Learn more.