Forces and Motion Worksheet (Questions 7-10)

A force is measured in which unit?

• Newton

• Joule

• Watt

• Pascal

Newton's first law of motion states that:

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

• Force is equal to mass times acceleration.

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

• Energy cannot be created or destroyed.

Newton's second law of motion states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. What is the correct formula for this law?

• F = m × a

• F = m / a

• F = a / m

• F = m + a

Newton's third law of motion states that:

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

• An object at rest stays at rest unless acted upon by a force.

• Force equals mass times acceleration.

• Objects in motion stay in motion unless acted upon by a force.

The difference between balanced and unbalanced forces is:

• Balanced forces do not change the motion of an object, while unbalanced forces do.

• Balanced forces always act in the same direction, while unbalanced forces act in opposite directions.

• Balanced forces only act on moving objects, while unbalanced forces act on stationary objects.

• Balanced forces increase the speed of an object, while unbalanced forces decrease it.

Friction affects the motion of an object by:

• Increasing its speed

• Decreasing its speed

• Having no effect on its speed

• Making it move in circles

What is inertia, and how does it relate to mass?

• Inertia is the tendency of an object to resist changes in its motion, and it increases with mass.

• Inertia is the force that moves objects, and it decreases with mass.

• Inertia is the energy stored in an object, and it is unrelated to mass.

• Inertia is the speed of an object, and it is constant for all masses.

Gravitational forces affect objects on Earth versus in space in which of the following ways?

• Objects on Earth experience stronger gravitational forces than in space.

• Objects in space experience stronger gravitational forces than on Earth.

• Gravitational forces are the same on Earth and in space.

• There is no gravitational force in space.

The different types of friction are:

• Static, sliding, rolling, and fluid friction

• Magnetic, electric, and gravitational friction

• Thermal, chemical, and nuclear friction

• Rotational, translational, and vibrational friction

Understanding forces and motion can improve safety in sports or vehicles by:

• Reducing the risk of injuries through better equipment and techniques

• Making activities more difficult

• Increasing the speed of vehicles without concern for safety

• Ignoring the effects of friction and impact