Forces & Movement Review

1. What two things define an object's velocity?

• weight

• acceleration

• direction

• speed

2. The normal force is also known as the ____ force.

• speed

• gravitational

• support

• friction

3. According to Newton’s third law of motion, what happens when you push against a wall?

• The wall pushes back at you with twice as much force as you push against it.

• The wall pushes back at you with the same amount of force.

• The wall does not resist at all.

• The wall pushes back at you with half as much force as you push against it.

4. What force causes the passengers in a car to move forward when the car comes to a sudden stop?

• gravity

• inertia

• centripetal force

• friction

5. Which of the following can change the velocity of a car?

• changing the oil

• changing direction

• filling the car's gas tank

• turning the key in the ignition

6. A force that pushes a small mass will have ____ effect on the acceleration than that same force pushing on a large mass.

• a smaller

• a greater

• the same

7. You push on an object with an applied force. What is the "reaction" force to your push?

• the object being pulled by Earth

• the object moving forward

• the object pushing back on you

• the object being lifted up

8. What is the force called that slows or prevents movement of objects in contact with each other?

• inertia

• momentum

• friction

• gravity

9. Why is it easier to play soccer on a grassy field than on an ice hockey rink?

• because there is less friction between the grassy field and your feet and the ball

• because there is more friction between the grassy field and your feet and the ball

10. If a bicycle that is traveling at 5 mph speeds up to 10 mph in 5 seconds, what is the bicycle’s acceleration?

• 1 mph/s

• 0 mph/s

• 5 mph/s

• 3 mph/s