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WorksheetsPhysics 1st Semester Exam REVIEW
Total questions: 55
Worksheet time: 28mins
If an object changes its direction of motion:
the mass of the object had to change.
the inertia of the object had to change.
the speed of the object stays the same.
a force must have been applied to the object.
The inertia of an object comes from its:
acceleration
mass
speed
force
If no forces are acting on an object, its motion will:
continue in the same direction with the same speed.
slow down and eventually stop.
continue at the same speed but could change direction.
continue in the same direction but could change speed.
What action must be taken to change the motion of an object?
Mass must be added to the object.
Weight must be added to the object.
Friction must be eliminated.
Force must be applied to the object.
An ice skater feels very little force as she moves in a straight line on her skates. According to Newton’s first law, which of the following statements about her motion is TRUE?
She must apply force with her skates to turn or stop.
She will stop almost immediately from friction.
Her mass decreases to maintain her constant-speed motion.
She will continue to move with exactly the same speed and direction.
The graph shows the motion of a an object moving in a straight line. From the graph, you may conclude that:
the object is accelerating at a constant rate of 3.5 m/sec2.
the object is moving from left to right.
the object is weightless as if it were in outer space.
the total force acting on the object is zero.
Which of the following situations can NEVER happen because it represents a violation of Newton’s first law?
The acceleration of an object is zero even though gravity exerts a force on the object.
The speed of an object is zero, but the object feels a force and its acceleration is not zero.
The speed of an object changes even though no forces are acting on the object.
The speed of an object remains the same even when several forces are acting on the object.
The acceleration of an object is:
equal to its weight.
equal to its mass divided by the force acting on the object.
equal to the force acting on the object divided by the mass of the object.
equal to the force acting on an object multiplied by the mass of the object.
Which of the following situations MUST have a net force?
An object accelerates from 1 m/sec2 to 2 m/sec2.
An object is at rest with zero speed.
An object is moving with a constant speed of 2 m/sec.
An object has a mass of 1 kilogram.
If the net force is negative and the speed is positive:
the speed will decrease over time.
the speed will increase over time.
the speed will stay the same.
the speed will immediately drop to zero.
Three forces are acting on an object as shown in the diagram. The object is not moving. Two forces are 2 newtons and 10 newtons. The third force is:
8 newtons.
10 newtons.
12 newtons.
20 newtons.
An object is observed to have an acceleration of 2 m/sec2 when a net force of 4 newtons is applied. The mass of the object is:
0.5 kg
1.0 kg
2.0 kg
8.0 kg
The same engine is placed in a large truck and a small car. The engine produces the same amount of force between the vehicle and the road in both cases. The truck:
has a greater acceleration than the car because the truck has a greater mass.
has a smaller acceleration than the car because the truck has a greater mass.
has the same acceleration as the car because the engine produces the same force.
has a smaller acceleration than the car because the truck is longer than the car.
Which of the following correctly describes the role of mass in Newton’s second law?
Mass is a measure of an object’s resistance to acceleration.
Mass is a measure of the amount of matter in an object.
Mass determines how much force an object feels from gravity.
Mass is measured in kilograms.
Force is best defined as:
any action that always speeds up an object in motion.
any action that always slows down an object in motion.
any action that could change the motion of an object.
any action that leaves the motion of an object unchanged.
The newton is a unit of force that is defined by:
the strength of gravity acting on a 1-kilogram object on the Earth’s surface.
an acceleration of 1 m/sec2 of an object with a mass of 1 kilogram.
a speed of 1 m/sec and an acceleration of 1 m/sec2.
the mass of a 1-kilogram object moving at a speed of 1 m/sec.
Three forces act on the cart shown in the diagram. The acceleration of the cart is:
to the left at 1 m/sec2
to the left at 2 m/sec2
to the right at 1 m/sec2
to the right at 2 m/sec2
Consider the motion of an object acted on by a net force. Which of the following describes a situation that IS POSSIBLE?
The net force is positive, and the acceleration and speed are negative.
The net force is positive, and acceleration and speed are also positive.
The net force is negative, the speed is negative, and the acceleration is positive.
The net force is negative, the speed is negative and the acceleration is zero.
The units of force come from Newton’s second law
(F = m a). In the metric system, the units for force are:
kg/m·sec2
kg·sec2/m
kg·m2/sec2
kg·m/sec2
When you kick a ball, your foot feels the ball because:
the ball is harder than your foot.
the ball exerts a force on your foot as a reaction to the force of your foot on the ball.
the ball accelerates away from your foot.
your foot is harder than the ball.
A boy on a skateboard throws a ball. The skateboard moves in the opposite direction from the thrown ball because:
the ball has positive energy, and the boy and skateboard are left with negative energy.
the ball carries away some inertia.
the ball exerts a reaction force on the boy as it is being thrown.
the skateboard resists acceleration due to Newton’s second law.
A basketball player with a mass of 70 kilograms jumps upward by pushing against the floor with his feet with a force of 1,200 newtons. Which is the best explanation for why the basketball player moves upward?
The player’s feet are connected to the rest of his body and distribute the 1,200-newton force over the whole body.
The floor pushes back upward on the player with a force of 1,200 newtons, which lifts the player off the ground.
The 1,200-newton force is equal to the force of gravity holding the player down.
The player’s weight is reduced by the 1,200-newton force.
Which of the following is NOT TRUE about an action-reaction pair of forces?
The action force is equal in strength to the reaction force.
The action force is opposite in direction to the reaction force.
The action force and reaction forces act on different objects.
The action force is applied first and the reaction force appears later.
If every force has an equal and opposite reaction, why don’t all forces cancel out with each other?
The action and reaction forces act in the same direction.
The action and reaction forces act on different objects.
The action and reaction forces are perpendicular to each other.
Acceleration separates objects before the forces can cancel out.
A 0.25-kilogram ball is observed to accelerate at 4,000 m/sec2 as it is hit with a bat. How much force is exerted on the bat by the ball?
1,000 N
2,500 N
4,000 N
16,000 N
The weight of a 1-kg mass is:
1 pound
4.48 N
9.8 N
9.8 pounds
The force called weight comes from:
friction
gravity
acceleration
energy
A rock with a mass of 25 kg has a weight of 40.8 N on the moon. What is the value of the acceleration of gravity (g) on the moon?
0.63 m/sec2
1.6 m/sec2
9.8 m/sec2
1,020 m/sec2
Which one of the following is NOT TRUE concerning mass and weight?
Mass is a property of matter and weight comes from gravity acting on matter.
An object at rest has the same mass everywhere, but its weight depends on the strength of gravity where the object is located.
Mass is measured in kilograms and weight is measured in newtons.
Mass is measured in newtons and weight is measured in pounds.
A bunch of bananas weighs 1.5 lbs on the scale at the grocery store. The mass of the bananas is:
0.33 kg
0.68 kg
3.3 kg
14.7 kg
A force of 10 lbs is applied to a wagon that weighs 100 lbs. The acceleration of the wagon is closest to:
0.1 m/sec2
0.2 m/sec2
1 m/sec2
10 m/sec2
Viscous friction occurs when:
smooth surfaces slide over each other.
rough surfaces slide over each other.
wet surfaces slide over each other.
dry surfaces slide over each other.
The coefficient of static friction is:
smaller than the coefficient of sliding friction.
a property of static electricity.
larger than the coefficient of sliding friction.
equal to the normal force.
Which of the following statements about friction is NOT TRUE?
Friction is a force that opposes motion.
Friction occurs because two objects are at different potential energies.
Friction occurs in solids, liquids, and gasses.
Oils and other lubricants can reduce but not eliminate friction.
A force of 5 N is required to slide a block at constant speed over the dry surface of a table. The block has a mass of 2.5 kg. The coefficient of sliding friction is:
0.2
0.5
2.0
12.5
An object is in equilibrium when:
the net force on the object is zero.
the weight of the object is zero.
the speed of the object is zero.
the acceleration of the object is 9.8 m/sec2.
Four forces are acting on the block in the diagram. One of the forces is unknown. If the block is in equilibrium, what is the correct unknown force?
Force A
Force B
Force C
Force D
Which diagram shows an object that will accelerate?
Diagram A
Diagram B
Diagram C
Diagram D
Which of the following does NOT describe an object in equilibrium?
A box is resting on a table without moving
A box is being pushed at constant speed across the floor in a straight line
A box is falling freely in the air with no strings attached
A box is being lowered straight down on a rope at constant speed
An example of a vector quantity is:
temperature
length
velocity
mass
A quantity whose measurement includes both size and direction is a:
scalar
distance
magnitude
vector
Vector quantities are represented by arrows. If two vector arrows are combined, the vector that represents their sum is called the:
resultant
equilibrium
component
negligent
A single force can be represented by two forces (Fx and Fy) at right angles to each other. The two forces (Fx and Fy) are called ____ forces.
equilibrant
negligent
resolution
component
An example of a scalar quantity is:
velocity
force
speed
acceleration
Four forces act concurrently on a point as shown above. The resultant of the four forces is:
0.0 N
5.0 N
14 N
20 N
Using the diagram , which vector best represents the resultant of forces F1 and F2 acting at point P?
1
2
3
4
An athlete runs 40 meters north and 30 meters south. The resultant displacement of the runner is:
70 meters north.
10 meters north.
70 meters south.
10 meters south.
Which pair of concurrent forces may produce a resultant force of 20 newtons?
5 newtons and 10 newtons
20 newtons and 20 newtons
20 newtons and 50 newtons
30 newtons and 5 newtons
A flock of Canada geese are flying at 41 miles per hour headed due south. If a 52 mile per hour east wind were to begin blowing, the resultant velocity of the flock would become approximately:
11 mph.
47 mph.
66 mph.
93 mph.
The normal force is:
the force acting to always oppose motion.
the force acting perpendicular to the surface.
the force from gravity.
the force acting parallel to the surface.
Which force always opposes the motion of an object?
Gravity
Normal
Parallel
Friction
An object is moving at constant speed on a slanted surface while a force is applied on the object parallel to the surface of the inclined plane. Which forces are in equilibrium?
Gravitational and normal forces
Frictional and the normal forces
Normal and parallel forces
Frictional and parallel forces
A 5-newton force directed north and a 5-newton force directed west both act on the same point. The resultant of these two forces is approximately:
5 newtons northwest.
5 newtons southwest.
7 newtons northwest.
7 newtons southwest.
The diagram above shows an object on an inclined plane. The object does not move on the inclined plane because Fgx balances Ff and:
Fgx balances Fgy
Fg balances Fn
Fn balances Fgy
Ff balances Fn
A 75-kilogram block rests on an incline which makes an angle of 35° with the horizontal. The force exerted on the block by the incline is about:
420 newtons.
515 newtons.
600 newtons.
735 newtons.
