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# force & motion

### Newton's Laws of Motion

Which of Newton's Laws of Motion explains why you should always wear a seatbelt while riding in a car? 1st Law
Which of Newton's Laws of Motion explains how force, mass, and acceleration are all related with this formula: f = ma 2nd Law
Which of Newton's Laws of Motion explains how every action has an equal and opposite reaction? 3rd Law
Bob pushed a box with a mass of 70 kg across the floor. The acceleration of the box was 2 m/s/s. What was the force? 140 N
The Law of Inertia is known as which of Newton's Laws? 1st Law
When we measure force, what unit do we use to label force? Newton
When an object pushes or pulls another object by touching it, what kind of force is it? Contact force
What is the force of attraction between two masses called? Gravity
A force that resists motion between two surfaces that are pressed together is called... Friction
What is the overall force acting on an object when all the forces are combined? Net force
If Sally pulled with 40 N of force to the left, and Sue pulled with 50 N of force to the right, in which direction, and with what force will the object move? 10 N, right
Will balanced forces ever change an object's speed or direction? No
Is it possible to have balanced forces on a moving object? Yes
What is needed to change an object's motion? an unbalanced force
The resistance of an object to a change in the speed or the direction of its motion is called... Inertia
Any force that keeps an object moving in a circle is... Centripetal
What is the mass of a truck if it produces a force of 10,000 N while accelerating at a rate of 5 m/s/s? 2,000 kg
What force is required to accelerate a car at a rate of 3 m/s/s if the car has a mass of 3,000 kg? 9,000 N
mass x velocity = ? momentum
Which has more momentum, a bicycle traveling at 40 km/h, or a pickup truck traveling at 40 km/h? pickup truck
What is the unit used to measure acceleration? m/s/s
What is the unit used to measure mass? kg
Do heavier objects have MORE or LESS inertia? MORE
Which of the following parts of a car will experience the most friction: headlights, radio, windshield wipers windshield wipers
Created by: janemcmillen