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WorksheetsSCIdasdas
Total questions: 35
Worksheet time: 18mins
What unit do scientists use to measure power?
Watt
Joule
Kelvin
Newton
Which type of energy doesn’t require a medium?
EMR
Thermal
All
Chemical
woman lifts a 6.63kg plant 2 meters. How much work does she do?
130.08J
32.50 J
13.26 J
3.32 J
The law of conservation of energy applies to:
Energy transfers but not energy transformations
Energy transformations but not energy transfers
Both energy transfers and energy transformations
d. Neither energy transfers nor energy transformations
Sound energy is considered a type of:
EMR
Thermal energy
c. Potential energy
. Mechanical energy
What type of energy is represented by the food we eat?
a. Thermal
al b. EMR
Chemical
Nuclear
When energy changes from one form to another form, the total amount of energy in the system
Increase
Decrease
Same
Varies
What determines an object’s kinetic energy?
Mass and force
Mass and distance
d. Speed and mass
c. Speed and force
An object is lifted 10m above ground and is unmoving. What statement is true?
The object has mechanical energy
The object does not have mechanical energy
The object has some potential energy but no mechanical energy
The object has some kinetic energy but no mechanical energy
What is the kinetic energy of a 40kg person running at 3m/sec?
60
180
120
360
When two surfaces slide past each other, what energy transformation occurs?
Mechanical to EMR
Thermal to Mechanical
Mechanical to Chemical
Mechanical to Thermal
Gravitational potential energy is influenced by
Mass and height above ground
Weight and height above ground
Weight and speed
Mass and speed
What is gravity?
A force that pulls objects towards each other as a result of their masses.
A force that pushes or pulls an object as a result of its velocity.
A force that pushes or pulls objects towards each other as a result of their charge
d. A force that resists a change in motion as a result of its mass.
Acceleration includes: (Circle all that apply)
objects speeding up
objects slowing down.
objects changing direction.
none
When brakes are applied to a moving car, the car decelerates but you do not. What causes your body to continue moving?
Friction
Inertia
Velocity
Net force
6. Which is not an example of a noncontact force?
Friction
Magnetic
Electric
Gravity
. Newton’s first law of motion states that:
an object at rest will remain at rest unless acted upon by a nonzero net force
if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object
the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force.
the rate at which velocity changes is influenced by speed and direction.
When is there static friction between your desk and the floor?
When the chair stands still
When the chair falls to the floor
When you lift the chair
When you slide your chair under your desk
Bella puts an iron block in a bucket of water. The block sinks. Which of the following forces is acting on the block?
I. the force of the liquid pushing up on the block
II. the force of gravity pulling down on the block
III. the force of the liquid pulling down on the block
I and II
II and III
I
I, II, III
If two forces have the same direction you must _____ to find the net force
subtract
add
divide
multiply
What happens to the gravitational force between two objects as the bodies become farther apart from each other?
The gravitational force stays the same
b. The gravitational force begins to repel the objects
the gravitational force decreases
. the gravitational force increases
. If a car is travelling on the highway at a constant velocity, the force that pushes the car forward must be_______.
greater than the weight of the car
equal to the force of friction exerted upon the car.
equal to the weight of the car
greater than the force of friction exerted upon the car
. Jennifer stands on one side of the filing cabinet and pushes with a force of 60 N. If Nathan wants to help Jennifer demonstrate balanced forces, what does he need to do?
stand on the same side of the cabinet and push with a force of 60 N in the same direction as Jennifer
Stand on the opposite side of the cabinet and push with a force of 60 N toward Jennifer
Stand on the opposite side of the cabinet and push with a force of 120 N toward Jennifer.
Cause the cabinet to move
Friction is a force that acts in a direction the _______ of the motion.
Opposite
b. same
c. different
What is the speed of a bobsled whose distance-time graph indicates that it traveled 100 m in 25 seconds?
4 m/s
250 m/s
0.25 mph
100m/s
26.When a bus starts suddenly, the passengers are pushed back. This is an example of which of the following?
a. Newton’s first law
b. Newton’s second law
. Newton’s third law
None
What is the mass of an object that requires a force of 90 N to accelerate at a rate of 2.6 m/s2
. 44.6 kg
. 34.6 kg
54.6 kg
. 89.6 kg
. A train that is accelerating at 5 m/s2 down the tracks and crashes into a car. If the train weighs 20,000 kg, how much force does the car experience?
a. 200,000 N
b. 300, 000 N
100, 000 N
400,000 N
What is Newton’s third law?
. law of gravity
law of force and acceleration
b. law of inertia
d. law of action-reaction
If three force are pulling on an object with 4 Newtons to the right, and one Newton up, and 4 Newtons to the left. What is the net force?
1N
5N
8N
9N
As a ball falls to the ground, its gravitational potential energy increases as its kinetic energy increases.
False
True
32. Chemical energy from food converting into mechanical energy is an example of an energy transfer.
False
True
. If one object loses energy, another object must always gain energy.
True
False
If the speed of an object is continuously changing with time, then its speed at a particular instant is called instantaneous speed.
True
False
. If the line on a distance-versus-time graph and a speed-versus-time graph are both straight with the same slope, they are showing the same motion.
False
True
