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WorksheetsTest - First Semester Final - 2020/2021
Total questions: 58
Worksheet time: 35mins
The SI unit force is called the Newton.
true
false
I don't know
The rate at which velocity changes with time is called acceleration.
true
false
Madden
The combination of all forces that act on an object is called the net force.
true
false
________________ is any motion of a body where gravity is the only force acting upon it.
kinematics
free fall
mechanics
velocity
The gravitational acceleration of an object in a vacuum near the surface of the Earth is defined as:
g = 9.8 m/s.
g = 9.8 m.
g = 9.8 m/s2.
g = 9.8 s.
When an object falls, ______________________________.
It accelerates at a constant rate until it hits the ground
It accelerates at a non-constant rate until it hits the ground
It accelerates at a constant rate until it reaches terminal velocity
It accelerates at a non-constant rate until it reaches terminal velocity
Do free falling objects move at constant velocity or do they accelerate?
Falling objects accelerate at 9.8 m/s2
Falling object move at constant velocity
Falling objects accelerate at 100 m/s2
It depends on the mass: heavy objects accelerate, light objects do not
If an object is in free fall for three seconds, about how fast will it be falling?
v = gt
10 m/s
20 m/s
30 m/s
40 m/s
If an object is in free fall for three seconds, about how far will it have fallen?
d = 1/2gt2.
9.8 m/s
5 m
20 m
45 m
Juan is standing on the balcony of his hotel room, at a height of 45 meters. He accidentally drops his cell phone over the railing. How fast will the phone be traveling when it hits the ground? Ignore the effect of air resistance. (Hint: how long does it take to hit the ground?)
9.8 m/s (10 m/s if you round 'g' to 10 m/s2)
24.9 m/s (30 m/s if you round 'g' to 10 m/s2)
149.76 m/s (150 m/s if you round 'g' to 10 m/s2)
46.99 m/s (50 m/s if you round 'g' to 10 m/s2)
Unbalanced forces acting on an object cause the object to ______.
tip over
accelerate
velocity
For a constant force, an increase in the mass ______
will result in an increase in the acceleration
have no effect on acceleration
will result in a decrease in the acceleration
The force of friction between two surfaces depends on ______.
the kinds of materials in contact
how much the surfaces are pressed together
both of these
neither of these
If the force acting on a cart doubles, its acceleration ______.
doubles
is halved
is equal to its weight
is equal to friction
If the mass of a cart doubles, its acceleration ______.
doubles
is halved
is equal to its weight
is equal to friction
Pressure is defined as ______
distance per unit time.
force per unit time.
force per unit area.
velocity per unit time.
A wagon has a mass of 50 kg. A net force of 200 N is applied. Its acceleration is ______.
F = ma
4 m/s*s
4 m/s
10,000 m/s*s
0.25 m/s*s
5N to the right, 5N to the left
7N to the right, 5N to the left
45N to right
75mph
Velocity includes speed and __________________.
Magnitude
Direction
Units
Displacement
What are the three ways an object can accelerate?
It speeds up
It slows down
It only speeds up
It changes direction
Which of the following is a unit for acceleration?
mi/hr
km/s
m/s/s
Ft
What force affects an object in free fall?
Gravity
Friction
No force
Tension
What does this graph represent?
Moving at constant speed
Speeding up
Not moving (at rest0
Slowing down
What does this graph represent?
Moving at constant speed
Speeding up
Not moving (at rest0
Slowing down
Which runner has the fastest speed?
Runner A
Runner B
Runner C
Newton’s 1st Law of motion is also the law of _________.
Inertia
Momentum
Balanced forces
Net forces
Inertia is the tendency of an object to ________ changes in motion
Include
Increase
Multiply
Resist
When forces are balanced, the net force is ________.
Negative
0
Positive
Newton’s 1st law states that an object won’t change its motion unless acted on by a(n) ___________ force.
Balanced
Positive
Unbalanced
Negative
Newton’s 2nd law of motion says that the force of an object is equal to its mass times its (a) .
What's the net force acting on the object?
9N left
1N left
9N right
1N right
A box sliding down an incline increases its speed 14 m/s in 2s. What’s the acceleration of the box?
a = v/t
0.143 m/s/s
3 m/s/s
7 m/s/s
28 m/s/s
A car travels 50m in 2s, what is the speed of the car?
v = td
10 m/s
25 m/s
20 m/s
5 m/s
How do you know that a hypothesis is scientific ?
A hypothesis is scientific if there is a test that can prove it wrong.
A hypothesis is scientific when enough important people refer to it.
All hypotheses are scientific.
A space probe that has run out of fuel in remote outer space (where there is no friction and no other planets or stars) continues moving
because some kind of force acts on it.
in a curved path.
even though no force acts on it, due to inertia
due to gravity.
Consider a student standing on a bus that is waiting at a stop light. When the bus suddenly moves forward, the student
falls forward
falls backward
falls through the floor of the bus
When sign painters Burl and Paul stand on opposite ends of a scaffold, the tension forces in the two supporting ropes
are equal.
depend on how much Burl weighs compared to Paul.
combine to equal zero.
are in equilibrium.
If Burl carried Paul piggy-back while standing in the middle of a scaffold, the tensions in the two supporting ropes would
cancel to zero.
be unequal.
more easily support Burl and Paul.
be equal.
Burl and Paul have a total weight of 1200 N. The tensions in the ropes that support the scaffold they stand on add to 1800 N. The weight of the scaffold itself must be
400 N
500 N
600 N
800 N
Earth moves about 30 km/s relative to the Sun. When you jump upward in front of a wall, the wall doesn't slam into you at 30 km/s. This is because the wall
has too little gravity to influence you.
moves in an opposite direction to you.
and you are moving at the same horizontal speed before, during, and after your jump.
has negligible inertia compared with the Sun.
If you are not wearing a seat belt and the car you are driving hits a fixed barrier, you will hit the steering wheel with some force. This motion forward happens because
The force of the collision has thrown you forward.
It's an illusion and the entire car is actually speeding backwards away from the wall
Your inertia makes you continue moving even after the car has stopped.
A skydiver has reached terminal velocity—she now falls at a constant speed. Is there a net force on her? If so, what is the direction?
There is a net force directed upward.
There is no net force.
There is a net force directed downward.
Which of these objects is in equilibrium?
A car driving down the road at a constant speed
A block sitting at rest on a table
A skydiver falling at a constant speed
All of the above
(a) Mass = More Acceleration
Explain why this picture demonstrates Newton's 2nd Law of motion.
Which distance/time graph would represent an object moving forward at a constant speed?
A
B
C
D
The 1,100 kg car comes to a stop. If the vehicle is accelerating at a rate of 1.2 m/s2, which force is CLOSEST to the net force acting on the vehicle?
F = M × A9,600 N
1,300 N
900 N
94 N
A dad (more mass) and a daughter (less mass) push against each other while ice skating. What would the motion of the two people be?
The dad moves forward, and the daughter moves backward with greater acceleration.
Both move forward, but the dad moves with greater acceleration.
The dad moves backwards, and the daughter moves forward with greater acceleration.
Both will move backwards, but the daughter moves with a greater acceleration.
Based on Newton's 3rd Law, if you are exerting a downward force on the chair, then the chair is...
destroying the forces
exerting a stronger downward force
causing the load to accelerate upwards
exerting an upward force that is equal to the downward force
Jackson throws a football 30 meters at a speed of 15 m/s. How long was the football in the air before Laurrence caught it for the touchdown?
450 s
2 s
0.5 s
3 s
