Forces and Motion Quiz True or False

1. Deceleration results from: -> Applying a force opposite the direction of motion
2. According to Newton’s Third Law, for every action there’s an opposite and equal reaction. As we punch air, why don’t we feel anything? -> Air has little mass, its weight isn’t affected by gravity.
3. We simultaneously throw one ball horizontally while dropping another from the same height. Which lands first? -> They land at the same time.
4. Which of the following can be said regarding an object in circular motion? -> The bigger the circle, the faster the speed to keep the same acceleration.
5. Which variable is the same for both x- and y- components when dealing with projectile motion? -> Time
6. At which angle must a cannonball be launched for its x- and y-components of initial velocity to be equal? -> 0°
7. If the radius of the Earth suddenly tripled, but mass stayed the same, what could be said about Earth’s gravitational acceleration at its surface? -> It would depend on the position of the Moon.
8. You drop an apple from a 5 meter high balcony. What is the apple’s final velocity? ->
9. If the Earth’s gravitational acceleration tripled, what would be the answer to the above question? -> –17.2 m/s
10. At maximum height, a cannonball has: -> No y-component of velocity

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