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WorksheetsPhysics February Review 3.1-3.7
Total questions: 59
Worksheet time: 40mins
A change in the speed or direction of an object is called (a) .
Static friction prevents you from slipping when you walk on a sidewalk.
True
False
Four types of friction are static friction, sliding friction, rolling friction, and (a) friction.
You use (a) friction when you leave marks on paper with a pencil “lead.”
To help move a large box, should you use a dolly with rolling wheels or slide the box across the ground?
(a)
When you put on the brakes of your bike, the wheels stop turning. Then friction between the wheels and the road slows your bike to a stop. Which type of friction is this?
(a)
Types of friction include:
static
sliding
fluid
all of the above
Static friction prevents you from slipping when you walk on a sidewalk.
True
False
Sliding friction is stronger than static friction.
True
False
A factor that affects the amount of friction against an object moving through the air include an object’s (a) .
The weakest type of friction that occurs between solid surfaces is (a) friction.
Friction that occurs in gases and liquids is called (a) friction.
10. When two forces act on the same object in the same direction, the net force is always less than the individual forces.
True
False
9. The net force acting on an object equals the sum of the individual forces when the two forces are acting in the same direction.
True
False
8. When two forces act on an object in the same direction, how should you calculate the net force?
a. adding the two forces
b. multiplying the two forces
c. subtracting the two forces
d. dividing the two forces
When a physics book is resting on a table, the upward and downward forces on the book are balanced and the net force equals zero.
True
False
6. When two forces act on an object in opposite directions, how should you calculate the net force?
a. dividing the two forces
b. subtracting the two forces
c. finding the average of the two forces
d. multiplying the two forces
The net force acting on an object is the combination of all of the individual forces acting on it.
True
False
2. Fill in the blank(s):
Any push or pull acting on an object is called a (a) .
1. The net force acting on you when you sit still in a chair is zero.
True
False
A wedge is an example of an inclined plane.
True
False
6. If the vector sum of all the forces acting on a particle is zero, then and only then, the particle remains un-accelerated.
True
False
3. A block weighing (Fg) 500 N is resting on a steel table (μs = 0.74) . The minimum force to start this block moving is ___ N.
270
0
200
370
2. A 5.3 kg block slowed by friction has an acceleration of -1m/s2. What is the force of friction on the block?
2N
3N
5.3N
-5.3N
1. Factors that affect friction between two surfaces include the:
a. amount of force pressing the two surfaces together.
b. smoothness of the two surfaces.
c. weight of the object on top.
d. all of the above
10. The counter force exerted by an elastic material as it changes shape is known as (a) force.
9. Fill in the blank(s):
(a) is the ability of a material to return to its original shape after being stretched or compressed.
8. The less an elastic material is stretched or compressed, the greater the force it exerts.
True
False
6. When an archer lets go of a bow's string, an arrow shoots in the opposite direction due to the elastic force of the released
string and bow.
True
False
5. Play objects with elasticity include
a. spring toys.
b. silly putty.
c. modeling clay.
d. all of the above.
4. The ability of matter to return to its original shape after being stretched or compressed is called (a) .
3. Select all possible answers:
Which of the following would increase the elastic force acting on that object?
a. Compressing a spring twice as much as its starting position.
b. Increasing the weight being vertically supported by a string.
c. Moving a spring to an unstretched position.
d. Stretching a bungee cord 1.5x as much.
2. An elastic material offers no resistance to forces that change its shape.
True
False
1. Which of the following does not describe an object with high elasticity?
a. A spring that easily compresses when pushed.
b. A piece of paper that rips after pulling on it.
c. A slinky that expands and contracts when held at one end.
d. A rubber band that stretches when you pull on it.
If two objects each have a mass of 10 kg, then the force of gravity between them _______.
is constant
is 100kg
depends only on their masses
is greater when they are closer together
The weight of a person on earth is 700N. If the value of acceleration due to gravity on moon is just one- sixth that of Earth, then what will be the weight of the person on moon, if the acceleration due to gravity on Earth is 9.8m/s2?
116.7N
11.9N
70.6N
300N
The acceleration due to gravity is zero at the ____.
a. Equator
b. Sea level
c. Center of the Earth
d. Poles
Mathematically, Newton's law of gravitational force is expressed as F= m1* m2* G divided by r squared?
True
False
What is the SI unit for the measure of weight?
(a)
Gravity acts only between objects that are touching.
True
False
Weight is a measurement of the force of gravity acting on an object with mass.
True
False
Which of the following are the main forces that affect the motion of everyday objects?
Friction
Applied Force
Gravity
Mass
Which of the following is NOT a fundamental force of the universe?
Mass
Gravity
Nuclear
What is the SI unit of force?
(a)
Only some changes in speed or direction are caused by forces.
True
False
Mass refers to the gravitational force on matter in contact with the surface.
True
False
Force is a vector because it has both magnitude and _________.
Direction
Length
What is the term used to describe the push or pull on an object?
Force
Density
Volume
Mass
A person is trying to push a box across with a force of 50N while is pushing back with a force of 30N, what is the net force?
(a)
Calculate the mass of an object whose weight is 83.0 N ( Weight is FG )
(a)
Force of 5.N is exerted on a 5.0kg box kept on the floor with the coefficient of static friction of 0.3. Find the friction force.
(a)
Find the coefficient of kinetic friction of an object whose mass is 5.0kg and has a 45N applied force, moving with a constant speed.
(a)
Which sentence is not a true description of the effect of Earth's gravity on objects?
a. Only objects with mass are affected by Earth's gravity.
b. Only objects that touch Earth are affected by Earth's gravity.
c. The closer objects are to Earth, the more affected they are by Earth's gravity.
d. The farther away objects are from Earth, the less affected they are by Earth's gravity.
Which of the following choices causes the atmosphere to be held in place around Earth?
a. work
b. speed
c. gravity
d. balance
Fill in the blank(s):
The strength of gravity between two objects depends on their distance apart and their (a) .
Why does the Moon orbit Earth?
a. There is magnetic attraction between the Earth and the Moon.
b. There is mechanical advantage between the Earth and the Moon
c. There is chemical attraction between the Earth and the Moon.
d. There is gravitational attraction between the Earth and the Moon.
An astronaut would weigh less on the Moon than on Earth because gravity is weaker on the Moon than on Earth.
True
False
The gravitational force between two objects can cause them to move. If Will has two rubber balls and
dropped them, which of the following would affect the gravitational force?
Shape
temperature
magnetism
mass
The SI unit for weight is the pound (lb).
True
False
