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WorksheetsUnit 1 Review: Energy, Forces, and Collisions
Total questions: 20
Worksheet time: 11mins
The diagram shows a cart moving freely along a track.
What happens to the energy of the cart as it moves from point A to point B on the diagram?
A. Potential energy is transformed to kinetic energy.
B. Kinetic energy is transformed to potential energy.
C. Both potential energy and kinetic energy stay the same.
What is the definition of a force?
A. a pull exerted on an object
B. a push or a pull exerted on an object
C. a change in the direction of motion of an object
When scientists studied geological columns from different parts of the world, they discovered that fossils of dinosaurs, many groups of reptiles, and marine invertebrates disappeared at the top of the Mesozoic section. What is the most likely explanation of this evidence?
A. The organisms evolved very quickly into new organisms.
B. Organisms likely migrated to different parts of the world.
C. An extinction event caused many of the organisms to die off.
Toni needs to set up a demonstration to prove that Newton’s third law applies during the collision of two objects. She has a small toy car, a big toy truck, and two identical billiard balls. She chooses to demonstrate the action-reaction force pairs by rolling the billiard balls toward each other. Why did Toni choose billiard balls instead of the other objects to illustrate her point?
A. The billiard balls have the same mass, making the result of equal forces easier to see.
B. The toy truck would exert more force on the toy car, showing unequal forces instead of equal ones.
C. The billiard balls are the same diameter, showing equal forces during a collision and proving Newton’s third law.
NASA is testing identical miniature rockets using the same platform. The data collected from one launch are shown in the graph.
Which of these describes the relationship between the rocket’s speed and its kinetic energy?
A. There is a linear relationship between speed and kinetic energy.
B. There is a constant relationship between speed and kinetic energy.
C. There is a nonlinear relationship between speed and kinetic energy.
Which of the following force is a contact force?
gravity
air resistance
magnetic force
pushing with your hands
Which of the following force is a noncontact force?
gravity
air resistance
magnetic force
pushing with your hands
When an object collides with a moon, the energy that forms the impact crater comes from the
(1.) __________ energy of the object. The size of the impact crater depends upon the (2.) __________ and
mass of the object.
(1.) kinetic
(1.) potential
(2.) acceleration
(2.) speed
A carpenter leaves several tools on the floor of his workshop when he goes for his lunch break. Sometime later the carpenter returns and sees that one of his coworkers has moved his tools to different shelves on a nearby bookshelf.
Which data would the carpenter need to collect to calculate the amount of work required to lift his tools onto the shelves?
Select all the correct answers.
the height of each shelf
the time it took to move each tool
the amount of force needed to lift each tool
What is the fossil record?
A. The list of the all fossils that exist.
B. The history of a single fossil species.
C. The history of life on Earth as recorded in fossils.
How do scientists identify a mass extinction event in the fossil record?
A. They look for all the genera going extinct in a short period of time.
B. They look for a lot of species going extinct over a long period of time.
C. They look for large drop in the number of genera over a short period of time
What are the factors that affect the size of an impact crater?
A. speed and mass
B. mass and density
C. density and speed
Which of these has the most kinetic energy?
A. a 25 kg fish tank sitting on a table
B. a 50 g fish swimming in a fish tank
C. a 7,500 kg car parked on a steep hill
How is mechanical energy calculated?
A. by adding potential energy and kinetic energy
B. by dividing potential energy by kinetic energy
C. by multiplying potential energy and kinetic energy
The diagram shows the curved path of a thrown ball.
At which point does the ball have the greatest amount of gravitational potential energy?
A. point W
B. point X
C. point Y
Which of these is considered a contact force?
A. the force between two magnets
B. the gravitational pull of a planet
C. the friction between an object and air
Which statement best describes the relationship between velocity and acceleration?
A. Velocity is the rate of change in acceleration.
B. Acceleration is the rate of change in velocity.
C. Velocity and acceleration are not related to each other.
A car accelerates from 5 m/s to 27 m/s in 10 seconds. What is the acceleration in m/s2 ?
A. 2.2
B. 2.7
C. 3.2
Jessica is comparing two balls. One ball has a mass of 1 kg, and the other has a mass of 2 kg. She pushes each with a force of 100 N. How do the accelerations of the two balls compare?
A. The 1 kg ball accelerates the same as the 2 kg ball.
B. The 1 kg ball accelerates half as much as the 2 kg ball.
C. The 1 kg ball accelerates twice as much as the 2 kg ball.
Look at the diagram of forces acting on an object.
The picture shows a push and a pull acting on a box of books sitting on the floor. What is the net force toward the right on the box?
A. 0 N
B. 50 N
C. 100 N
