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Chapter 12 Quiz
Forces Quiz
| Question | Answer |
|---|---|
| Any push or pull on an object | Force |
| The net force exerted on an object will produce a proportional acceleration. That is, if a force acts on something, it accelerates. | Newton’s 2nd Law of Motion. |
| What explains the relationships among mass, force and acceleration? | Newton’s 2nd Law of Motion – F(force) = m (mass) • a (acceleration) |
| The pull of gravity on an object is its __________. | Weight |
| The amount of matter in an object is its _______. | Mass |
| Mass is also a measure of the _______, or resistance to change in motion of an object. | inertia |
| The SI unit for mass is | g or kg |
| The SI unit for weight is | N - newtons |
| Is force a vector or scalar quantity | vector - it needs direction |
| What law can be stated as “to every action, there is an equal and opposite reaction”? | Newton’s 3rd Law of motion |
| The property of a moving object resulting from its mass and velocity | Momentum (p= m • v) |
| In the formula p= m • v, what does the p stand for? | Momentum |
| What is the SI unit for momentum | kgm/s |
| The Newton, the SI unit for force can also be written as the units for m x a combined. What is that? | kgm/s2 |
| What is the size of the force of the acceleration of gravity on earth (g)? | 9.8 m/s2 towards the center of the earth |
| How do we measure Mass in Science? | We measure mass in kg, using a balance. |
| How do we measure Weight in Science? | We measure weight in Newtons, using a spring scale. |
| Which one does not change and cannot be zero, mass or weight? | mass |
| Because you are getting further from the center of the earth, as you climb up a mountain, or ascend in a plane, your weight will _____ | decrease |
| What is a free body diagram? | A picture of one object showing all the forces acting on that object as vector arrows. |
| If two forces are acting in the same direction, how do you find the net force? | You add the two |
| If two forces are acting in opposite directions on the same object, how do you find the net force? | You subtract them |
| What devise do we use to measure forces | spring scale |
| Define net force | The sum of all the forces acting on an object |
| Define inertia | An objects resistance to change in motion |
| Problem solving: What is the force required to move a 5,000 kg car with an acceleration of 4 m/s2? | F = m x a! 20,000 kgm/s2 or 20,000 N |
| What is the acceleration of a 4,000 kg car pushed with a force of 12,000 N? | F = m x a! Solve for a. 3 m/s2 |
| What is the weight of a 4,000 kg car? | Remember W = m x g. 39,200 N or 39,200 kgm/s2 |
| What is the momentum of a 110-kg professional fullback running across the line at 9.2 m/s. | p = m x v. p is momentum and v is speed or velocity. 1012 kgm/s |
| Draw a free body diagram for a jet flying in the air | It should have thrust pointing forward, gravity down, drag backwards, and lift upwards |
Created by:
tbrandt
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