Exploring Forces and Motion

What is the unit of force in the metric system?

• Kilogram

• Newton

• Metre

• Joule

Which of the following is an example of a contact force?

• Gravity

• Magnetic force

• Friction

• Electrostatic force

What does Newton's First Law of Motion state?

• Force equals mass multiplied by acceleration

• An object at rest or in uniform motion will remain so unless acted upon by an unbalanced force

• For every action, there is an equal and opposite reaction

• The greater the mass, the greater the force needed to move it

• 10 N

• 9.8 N

• 98 N

• 980 N

In a force diagram, what does an arrow represent?

• The speed of an object

• The mass of an object

• The direction and magnitude of a force

• The temperature of an object

Which of the following best describes balanced forces acting on an object?

• The object accelerates in the direction of the larger force

• The net force is zero and the object does not change its motion

• The object always remains stationary

• The forces act in the same direction and add together

A book is sitting on a table. Which pair of forces represents balanced forces acting on the book?

• The weight of the book downward and the friction from the table

• The weight of the book downward and the normal force from the table upward

• The applied force pushing the book and the weight of the book

• The magnetic force and the gravitational force

Two students are pulling a rope in opposite directions. Student A pulls with a force of 40 N to the left, and Student B pulls with a force of 55 N to the right. What is the net force and in which direction does the rope move?

• 95 N to the right

• 15 N to the left

• 15 N to the right

• 95 N to the left

Why does a ball rolling along a flat surface eventually come to a stop?

• Gravity pulls the ball downward and stops it

• The normal force reduces the speed of the ball

• Friction between the ball and the surface acts against the direction of motion

• The ball runs out of energy stored inside it