WorksheetsPK Energy & Balanced & Unbalanced Forces Review
Total questions: 26
Worksheet time: 21mins
Which of these objects shows unbalanced forces?
A pencil lying on a desk
A ball sitting on the floor
A poster hanging on the wall
A leaf floating to the ground
The illustration shows the forces, in Newtons (N), acting on three different blocks.
Which blocks will move under these conditions?
Blocks 1 and 2
Blocks 2 and 3
Blocks 1 and 3
Blocks 1, 2, and 3
Which of the following examples best represents an object with balanced forces acting upon it?
A boat moving through water.
A book siting on a high shelf
A wagon rolling down a steep hill
A baseball thrown in the air
Two students, John and Taylor, pull in opposite directions, but neither move positions. An image is provided.
Which of the following best describes the forces being applied in this situation?
The forces are balanced, and the net force is positive.
The forces are unbalanced, and John applies a greater force.
The forces are unbalanced, and Taylor applies a greater force.
The forces are balanced, and the net force is zero.
Mr. Williams is giving examples of balanced and unbalanced forces. Which of the following situations is an example of unbalanced forces acting upon an object?
A rock accelerating as it rolls down a hill
A rope being pulled from both sides with equal force
A car moving constantly at 30 miles per hour
A science textbook lying on the floor
If the two forces on an object are equal in size and opposite in direction, the forces are balanced, and no change in motion results. Which of the following situations is an example of balanced force acting upon an object?
A rope being pulled from both sides with equal force
A rock accelerating as it rolls down a hill
A car moving constantly at 30 miles per hour
An 11-gram pen falling off a table onto the floor
What motion will result from two forces acting on an object: one force of 50 Newtons to the east, the other a force of 30 Newtons to the west? The object will –
move east at a constant speed.
accelerate to the east.
move west at a constant speed.
accelerate to the west.
The illustrations show four boxes being acted on by forces.
Every person pushes or pulls with the same force, so which box will most likely move?
Box A
Box B
Box C
Box D
Potential and kinetic energy are similar in that -
both depend on the height of an object off the ground
each kind can be converted into the other form
both are demonstrated when an object is in motion
either will produce an increase in the mass of an object
Which of the following examples best demonstrates kinetic energy?
A brick lying on the ground
A kite flying across the sky
A television sitting on a table
A curtain hanging in the window
An airplane is demonstrating a conversion of kinetic to potential energy when –
it ascends to a higher altitude
more passengers board the plane
it moves downward to make a landing
the wheels spin as it moves on the ground
Students conducted an experiment by stretching the same rubber band to various lengths, releasing it, and measuring how far it traveled. Based on the chart, what conclusion can be drawn?
The more mass that a rubber band has, the more difficult it is to move.
The shorter the length of a rubber band, the less energy can be stored it it.
The more potential energy put into a rubber band, the more kinetic energy released.
The farther a rubber band travels, the less it can be stretched later on.
As a boulder rolls from the top of a hill to the bottom, how does its potential and kinetic energy change?
Potential and kinetic energy both increase
Potential increases and kinetic decreases
Potential decreases and kinetic increases
Potential and kinetic energy both decrease
Which of these best shows a change from potential to kinetic energy?
Water flowing over a tall cliff
A rubber band being stretched
Electricity making a bulb light up
A stone lying on top of a mountain
Newton’s first law of motion, applied to a book sitting on a table, would explain that the book will not move until which of the following conditions is met?
Gravity on the book can be reduced to zero
Unbalanced forces act on the book
Balanced forces act on the book
Friction being exerted on the book
