WorksheetsForces and Energy
Total questions: 24
Worksheet time: 29mins
What is a force?
a pull exerted on an object
a measure of how heavy an object is
a push or a pull exerted on an object
a change in the direction of motion of an object
Sasha pulls a block across the floor at a constant speed. Why doesn’t the motion of the block change even though Sasha is pulling on it?
Sasha’s force on the block is balanced by the friction force.
Sasha’s force on the block is balanced by the gravitational force.
If Sasha was not pulling on the block, there would be no forces on the block, and it would speed up.
If Sasha was not pulling on the block, there would be no forces on the block, and it would stop moving.
When a comet enters the solar system, it curves toward the sun. Which statement describes why the sun does not move when a comet is nearby?
There is no force exerted on the sun from the comet.
There is no force exerted on the sun unless the sun and comet collide.
The force on the sun from the comet is smaller than the force on the comet from the sun because the comet’s speed is too great.
The force on the sun from the comet is equal to the force on the comet from the sun but does not cause the sun to move because the sun is too massive.
The weights of four objects with different masses have been calculated to show how much each object would weigh on four different planets.
Based on the table, which object would have the largest mass and greatest weight on Earth?
Object A
Object B
Object C
Object D
Rebecca is practicing her aim by throwing a ball at a target.
The ball exerts a force on the target, causing the target to fall over. But when this happens, the ball bounces backward. Why does the ball bounce backward?
The target exerts a larger force on the ball because the ball is very bouncy.
The ball exerts a larger force on the target, causing the target to have a larger change of motion than the ball.
The target exerts the same size force on the ball, so when the target moves in one direction, the ball moves in the opposite direction.
The ball exerts a smaller force on the target because the ball is smaller than the target, so the target causes the ball to bounce backward.
The diagram shows four blocks suspended on identical dynamometers, a tool that is used for measuring the weights of objects.
Which object has the greatest weight?
object A
object B
object C
object D
Is gravity a contact force or a noncontact force?
contact force
noncontact force
Is friction a contact force or a noncontact force?
contact force
noncontact force
Is air resistance a contact force or a noncontact force?
contact force
noncontact force
Is pushing with your hands a contact force or a noncontact force?
contact force
noncontact force
The arrows in the force diagrams represent the various forces acting on a box. The box starts out at rest.
Which diagram shows that the box will start moving to the left?
The arrows in the force diagrams represent the various forces acting on a box. The box starts out at rest.
Which diagram shows that the box will start moving to the right?
The arrows in the force diagrams represent the various forces acting on a box. The box starts out at rest.
Which diagrams show that the box will not start moving?
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?
Potential energy is transformed to kinetic energy.
Kinetic energy is transformed to potential energy.
Both potential energy and kinetic energy stay the same.
Potential energy decreases and kinetic energy stays the same.
Alan launches a ball of clay into the air using a catapult. He calculates its kinetic energy to be 9.0 J. Then he tears it in half and forms a ball that has half the mass. He launches the smaller ball into the air at the same speed. What is the kinetic energy of the smaller ball?
3.0 J
4.5 J
9.0 J
18.0 J
Which diagram models the position of a soccer ball when it has the greatest amount of gravitational potential energy?
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?
There is no relationship between speed and kinetic energy.
There is a linear relationship between speed and kinetic energy.
There is a constant relationship between speed and kinetic energy.
There is a nonlinear relationship between speed and kinetic energy.
Consider these two pictures of an archer.
Identify which picture models the greatest potential energy.
Which direction does the gravitational force on the ball point?
Always up
Always down
Always to the right
The direction of the gravitational force depends on where the ball is.
There is no gravitational force on the ball.
Which position of the ball has the highest potential energy?
Position A
Position B
Position C
Which position of the ball has the lowest potential energy?
Position A
Position B
Position C
Is this line an accurate line estimate of best fit for the data?
Yes
No
Is this line an accurate line estimate of best fit for the data?
Yes
No
