Force and Motion

When an object is at rest, what is its speed?

• 2m/s²

• 1m/s²

• 3m/s²

• 0m/s²

Newton's first law of motion states that an object will stay at rest unless a(an) ____________________ acts on it.

• unbalanced force

• variable speed

• balanced force

• strong force

An 80kg long jumper in flight accelerates at a rate 10/s^{2 . What is the force of the long jumper?}

• 900n

• 80n

• 800n

• 0.5n

When forces are balanced, the total force_________?

• is greater than the sum of of the forces

• is equal to the two forces combined

• is negative

• is zero

A person in a head-on collision who is not wearing a seat belt continues to move forward at the original speed of the car because of________?

• friction

• gravity

• inertia

• weight

Force is measured in what units?

• kilograms

• Newton

• degrees

• m/s2

A force is exerted on a box and an equal and opposite force is exerted by the box. What explains this?

• conservation of energy

• Newton's second law of motion

• Newton's first law of motion

• Newton's third law of motion

How much force is required to accelerate to 25 kg mass at 3m/s²

• 100 N

• 25N

• 0.04N

• 75N

Given a force of 48n and an acceleration of 8m/s² , what is the mass?

• 6 kg

• 384 kg

• 8 kg

• 10 kg

If the force used to push a shopping cart increases, the cart's acceleration will

• decrease

• increase

• remain the same