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Forces and Momentum
Forces and Momentum
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Physics quiz on forces, Newton's laws of motion, gravity, friction, and momentum
Flashcards
21 cards
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Questions
21
Answers
1
You kick a ball with a force of 30 N. How much force does the ball exert on your foot?
Less than 30 N
Need more information
30 N
More than 30 N
2
The force of gravity is strongest in which diagram?
3
4
2
1
3
The total momentum of objects after a collision ____ the total momentum before.
is less than
is greater than
is the same as
depends on the mass of the objects
4
Action: You push on a table. Reaction: _______________
There is friction between the table and floor.
The table pushes on you.
The table moves.
There is gravity acting on the table.
5
The combination of all the forces acting on an object is called the
union of forces.
super force.
net force.
total force.
6
A 5 kg cannonball is fired at 40 m/s from a 1,000 kg cannon. What is the recoil speed of the cannon?
0.2 m/s
125 m/s
8,000 m/s
40 m/s
7
Which object has no net force acting on it?
A ball rolling across the floor with a constant speed.
A box slowing down as it slides across a floor.
A person riding a carousel in a circle at constant speed.
A car gaining speed as it gets on the highway.
8
An astronaut on the Moon has _____________ compared to when they're on Earth.
the same mass and the same weight
less mass and less weight
the same mass but less weight
less mass but the same weight
9
Friction is defined as
rate at which velocity changes
force that opposes motion between two surfaces in contact
resistance of an object to a change in its velocty
speed of an object in a particular direction
10
The metric unit of force is called the ____________.
kilogram
Joule
pound
Newton
11
A 10.0 kg dog chasing a rabbit at 6.0 m/s has a momentum of
1.67 kg*m/s
60.0 kg* m/s
0.6 kg*m/s
16 kg*m/s
12
What force is required to cause a 2,000 kg car to accelerate at a rate of 5 m/s/s?
4,000 N
10,000 N
400 N
100 N
13
Momentum depends on
mass and speed
acceleration
mass
speed
14
Increasing the net force on an object will cause the acceleration to
decrease
increase
remain the same
15
For every action there is an equal and opposite reaction.
Law of conservation of momentum
Newton's second law of motion
Newton's first law of motion
Newton's third law of motion
16
Which object does
not
have momentum?
a fish swimming in a pond
a feather falling to the ground
a boulder rolling down a hill.
a rock by the side of the road
17
When air resistance balances the weight of an object that is falling, the speed of the object
remains constant.
rapidly increases.
slowly decreases.
none of the above.
18
An object at rest will stay at rest, an object in motion stays in motion unless acted on by an unbalanced net force.
the law of conservation of momentum
Newton's first law
Newton's second law
Newton's third law
19
A 40 kg shopping cart is accelerated by a 20 N net force. What is the acceleration of the cart?
2 m/s/s
0.5 m/s/s
20 m/s/s
800 m/s/s
20
Objects accelerate only when a(n) ________ net force acts on them.
unbalanced
balanced
equal and opposite
normal
21
An object's inertia depends on its
mass
speed
mass and speed
volume
