Force and Motion

A student places a ball on the ground and kicks it hard. The ball moves along the ground. Which statement is true?

• The kick decreases the weight of the ball

• The kick applies force, which changes the direction of the ball.

• The kick decreased the force of gravity acting on the ball.

• The kick removes friction between the ball and the ground.

Which ball would create more force upon impact?

• a fast moving ball

• a slow moving ball

• a ball at rest

• none of the above

A force is described as . . .

• a push only

• a pull only

• a push or a pull

• none of the above

What unit do scientists use to measure force?

• Newton

• Grams

• Meters

• Meter per second per second

Which force always pulls downward on objects?

• Support force

• Friction force

• Gravity

• Air resistance

Test paper is sitting at rest on your desk. Which of the following statements best describes this situation?

• There are no forces acting on your paper.

• Your paper pushes on the desk only.

• The desk pushes on your paper only.

• The forces acting on the paper are balanced.

What forces are acting on a dropped book that falls to the floor?

• Gravity only

• Gravity and air resistance

• Air resistance

• Friction only

A change to an object's motion is caused by . . .

• Balanced forces

• Unbalanced forces

• Acceleration

• Velocity

This game of tug of war is an example of _________ forces. 

• unbalanced
• balanced
• potential
• net zero

The girls in this picture represent ________ forces. 

• kinetic
• balanced
• unbalanced
• chemical