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WorksheetsDA 2 Review Physics
Total questions: 51
Worksheet time: 1hrs 28mins
How much momentum does a 30 kg object going 4 m/s have?
An object going 3 m/s has 36 kgm/s of momentum. Find mass.
A 40 kg boy on a skateboard throws a 2 kg ball, 20 m/s to the left. Find how fast the boy is going afterward.
Match the following terms with their definitions:
1. Momentum
2. kgm/sec
3. Law of Conservation of momentum
4. Weight
5. Inertia
A. Momentum does not change in a closed system OR m₁v₁ = m₂v₂
B. Units for momentum
C. Measure of the product of an object’s mass and velocity.
D. Changes when gravity changes.
E. Doesn’t change with gravity.
(a)
Which of Newton’s Three Laws Applies? A rocket moves forward because gases are pushed out the back.
First Law
Second Law
Third Law
Which of Newton’s Three Laws Applies? You pull back on the paddle and the canoe goes forward.
First Law
Second Law
Third Law
Which of Newton’s Three Laws Applies? A larger car takes a bigger engine to move it.
First Law
Second Law
Third Law
Which of Newton’s Three Laws Applies? Once the engines stop, a rocket coasts through space.
First Law
Second Law
Third Law
Find the momentum of a 25 kg object going 4 m/s.
An object is going 22 m/s and is 3 kg. Find momentum.
A pingpong ball has 2 kgm/s of momentum when thrown 8 m/s. Find the mass of the ball.
A 25 kg cart has 125 kgm/s of momentum. How fast is the cart going?
A 50 kg boy on ice skates throws a 5 kg ball to the left. If the ball ends up going 20 m/s, how fast is the boy going?
Two astronauts push off of each other in space. The 80 kg astronaut ends up going 10 m/s. The other one ends up going 8 m/s. What is the mass of the other astronaut?
Find the weight of a 25 kg table. (Use g = 10 m/s²)
Weight is a force that depends on mass and:
friction
gravity
magnetism
energy
Compared to your weight and mass on Earth, if you were on the moon:
your weight and mass would be less.
your weight would be less but your mass would remain the same.
your weight would remain the same, but your mass would be less.
your weight would be greater, but your mass would remain the same.
The picture shows a force vector arrow pointing down. The best name for this downward force is:
gravity
drag
buoyancy
friction
The correct equation to solve for weight in Newtons is:
W = m/g
W = g/m
W = grams
W = mg
On Earth, the acceleration due to gravity is constant. Without air resistance, objects will fall to the ground at the same acceleration.
True
False
The acceleration due to gravity on Earth is .....
g = 1.6 m/s2
g = 3.8 m/s2
g = 9.8 m/s2
g = 24.6 m/s2
A free-falling object falls at an acceleration of 9 m/s2 (with air resistance). How fast is it going after two seconds?
9 m/s
18 m/s
27 m/s
36 m/s
Define acceleration due to gravity.
The force of gravity acting on an object.
The velocity of an object under the influence of gravity.
The acceleration experienced by an object due to gravity.
The force of gravity.
What is the velocity of an object that has been falling freely in a vacuum for 2 seconds?
9.81 m/s down
10.18 m/s down
19.62 m/s down
39.24 m/s down
A golf ball accelerates off a tee at 15m/s2, changing its velocity from 0m/s to 50 m/s down the fairway. How long did it take the golf ball to accelerate?
750 seconds
35 seconds
0.3 seconds
3.3 seconds
Which graph shows the object standing still?
A
B
C
D
When are you undergoing an acceleration in a car?
speed up
slow down
make turns
All of the above
Why does a car accelerate as it round a corner at a constant speed?
Its direction changes
It doesn't
It slows down
Its speeds up
Acceleration is defined as the CHANGE in
time it takes for one place to move to another place.
velocity of an object.
distance / time
velocity / time
the tendency of an object to resist a change in its motion
acceleration
inertia
mass
frame of reference
Which has the MOST inertia?
Objects with greater _________ also have greater inertia.
speed
mass
force
friction
What kind(s) of objects have inertia?
all objects with mass
only objects at rest
only objects in motion
only objects whose motion is being changed
The sum of all forces acting on an object and direction is called the
Balanced Force
Net Force
Unbalanced Force
Contact Force
A push/pull exerted on an object is called
Force
Momentum
Speed
Net force
Are the forces balanced or unbalanced?
Balanced
Unbalanced
A Newton is a unit of ______.
Acceleration
Inertia
Force
Velocity
Name the missing force.
Normal Force
Push/Pull Force
Friction Force
Tension Force
This diagram can be used to indicate which of the following? (TWO correct answers)
An object at rest
An object accelerating
An object decelerating
an object moving at a constant velocity (speed)
(Trick question -- there is only one correct answer)
Which of the following is true about this free-body diagram?
the forces are balanced
the object is moving upward
the object is free-falling
the forces are unbalanced
A leftward force is applied to a crate to push it across the floor at a constant speed. Which is the correct force diagram?
A rightward force is applied to a dresser to accelerate it to the right across the bedroom floor.
A bola is an old hunting instrument. If three rocks with a combined mass of 0.75 kg are spun at a speed of 20 m/s with a radius of 0.5 m, how much centripetal force is required to keep them spinning.
600 N
45 N
30 N
400 N
If car A and car B are both traveling at the same speed, which will require a higher centripetal force?
Car A
Car B
They have the same centripetal force
In the diagram of the car, if the driver took his hands off the steering wheel, which arrow correctly shows the direction the car would travel in?
A
B
C
D
A car is rounding a curve as shown in the diagram. Which arrow correctly shows the direction of the centripetal force keeping the car in circular motion?
A
B
C
D
A car is rounding a bend as shown in the diagram. Which arrow correctly shows the direction of the cars velocity?
A
B
C
D
Decreasing the radius when making a turn allows you to____?
Increase your friction
Keep a high speed
Change your inertia
Decrease gravitational pull
If centripetal force stopped acting on all satellites they would continue traveling in space in a constant direction and constant speed.
True
False
An engineer is planning a road with a turn. If the speed limit is 20 m/s and the centripetal acceleration cannot exceed 8.5 m/s/s, how big must the radius of the turn be?
2.4 m
47 m
170 m
3400 m
Why should you reduce speed around a turn if the road is icy?
Because your car will travel in a straight line unless forced to do otherwise
Because the ice reduces the frictional force between the tires and the road.
Because a minimum amount of centripetal force is required to keep your car moving around the curve.
All of the above.
