stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Newton's laws of motion Flashcards | StudBud
Explore
/
Newton's laws of motion
Newton's laws of motion
21 terms
·
StudBud Administration
·
69 plays
Mechanics Newton's laws of motion #ks5 #alevel #physics #newton
Flashcards
21 cards
F
Practice quiz
P
Host live
L
Questions
21
Answers
1
Crumple zones work because
increasing t decreases a and therefore F
decreasing t decreases a therefore F
increasing t decreases a therefore increasing F
increasing t increases a therefore decreasing F
2
A boy is in a lift that is accelerating down. The boy exerts a force on the floor that is
less than the weight of the boy
greater than the weight of the boy
less than the force of the floor on the boy
greater than the force of the floor on the boy
3
The equal and opposite forces on two bodies give them equal size accelerations. This statement
Can't be true
Is sometimes true
Must be true
4
Which body is in equilibrium?
a car moving at constant speed along a straight, level road
a projectile at the highest point in its trajectory
a satellite orbiting Earth in a circular orbit
a ball falling freely toward the surface of Earth
5
The
most useful
way of stating Newton's Third Law is
Forces occur in pairs
If A puts a force on B B puts an equal & opposite force on A
To every action there is an equal and opposite reaction
F=ma
6
Calculating weight using mass x acceleration due to gravity
gives the wrong answer
gives the right numerical answer but invites confusion
7
Which situation describes an object that has no unbalanced force acting on it?
a satellite orbiting Earth
an apple in free fall
an ice hockey puck moving at constant velocity across ice
a laboratory cart moving down a frictionless 30° incline
8
What is
meant by
the weight of an object?
the gravitational field acting on the object
the earth's gravitational pull on the object
the mass of the object x gravitational field strength
the object’s mass x acceleration
9
Which diagram shows the forces producing the greatest magnitude of acceleration of the block?
4
2
1
3
10
A boy pulls a sled of weight 60 N with force of 20 N. What is the force that the sled exerts on the boy?
20 N
80 N
40 N
60 N
11
Which of the following statements is true for the two forces in a Newton’s third law pair?
They act in different directions on the same body
They have different magnitudes & act in different directions
They have the same magnitude & act in the same direction
They have the same magnitude and act on different bodies
12
g=9.81 ms
-2
. An object has an acceleration of 2.00 ms
-2
downwards. The resultant acceleration is
11.81 ms-2
7.81 ms-2
2.00 ms-2
9.81 ms-2
13
Which statement about Newton’s laws of motion is correct?
The first law is a special case of the second law.
Conservation of energy is a consequence of the third law.
The third law follows from the second law.
14
How should weight be calculated
mass x acceleration due to gravity
mass x gravitational field strength
15
Newton's first law states
A body's motion remains constant unless acted on by a net force
Force is proportional to acceleration if mass is constant
If A exerts a force on B then B in turn exerts a force on A.
A body can only move if there is a force on it.
16
If you have a glass sliding along a table, it will eventually come to a stop. Which law?
Newton's second Law
All
Newton's third Law
Newton's First Law
17
A constant mass has a constant acceleration. The resultant force acting on the mass
increases uniformly with respect to time
is proportional to the velocity
is zero
is constant but not zero
18
Newton's second law states
A body's motion is constant unless acted on by a net force
Force is proportional to acceleration if mass is constant
Mass is proportional to acceleration
If A exerts a force on B then B in turn exerts a force on A.
19
Which body is in equilibrium?
a satellite moving around Earth
a block sliding at constant velocity across the floor
a cart rolling down a frictionless incline
an apple falling freely
20
Newton's third law states
If A exerts a force on B then B in turn exerts a force on A.
A body's motion remains constant unless a net force acts
Force is proportional to acceleration if mass is constant
21
A force acts on a moving ball, how many of these changes could happen?
3
2
1
4
