Physics Reading

What is the scientific definition of force?

• The ability to perform work

• A push or a pull on an object

• The speed at which an object moves

• The weight of an object

According to the text, when does your foot exert a force on a soccer ball?

• Only when the ball is moving

• Only when the ball is stationary

• While the ball is touching the foot

• After the ball has left the foot

According to Newton's third law of motion, what happens when a swimmer pushes against the pool wall?

• The wall does not exert any force on the swimmer.

• The wall pushes back on the swimmer with a force weaker than that exerted by the swimmer.

• The wall pushes back on the swimmer with an equal and opposite force.

• The wall moves in reaction to the swimmer's push.

What does Newton's third law of motion imply about the forces when two objects interact?

• The forces are exerted in the same direction.

• Each object affects the motion of both objects involved.

• The forces are equal in magnitude but opposite in direction.

• One object always exerts a stronger force.

What does the experiment with pendulums demonstrate about the forces they exert on each other?

• The forces are unequal in strength and direction

• The forces are equal in strength but different in direction

• The forces cause the pendulums to move in the same direction

• The forces cancel each other out, causing no movement

What was the significance of Newton using pendulums of different sizes and materials in his experiments?

• To show that the size of the force depends on the weight of the pendulum

• To prove that different materials affect the strength of the forces

• To demonstrate that the size of the force on one pendulum is always the same as on the other

• To illustrate that larger pendulums move faster than smaller ones

What is the result of the forces exerted by the skateboarder's foot and the ground?

• A) The skateboard moves backward.

• B) The skateboard does not move.

• C) The skateboard moves forward.

• D) The skateboarder falls off.

What effect do the forces have during a spacewalk when the astronaut pushes on the spacecraft?

• A) The spacecraft moves towards the astronaut.

• B) The astronaut and the spacecraft move away from each other.

• C) The spacecraft remains stationary.

• D) The astronaut pulls the spacecraft closer.

Which force opposes motion between two surfaces that are touching?

• Net force

• Balanced force

• Unbalanced force

• Friction

Why do mushers want to finish the race with as many dogs as possible?

• To care for the dogs better

• To increase the force on the sled

• To finish the race faster

• To keep the dogs from getting sick