Forces & Motion Questions

1. Forces & Motion Questions Reviewing the Unit

2. Which of the following has the most momentum? • A 20-kilogram ball at rest • A 5-kilogram ball rolling at 4 meters per second • A 10-kilogram ball rolling at 2 meters per second • A 10-kilogram rolling at 4 meters per second

3. Cindy is at the park. She throws a paper airplane northward. There is a strong wind blowing from West to East. What will most likely happen? • The paper airplane will turn southward. • The paper airplane will turn westward. • The paper airplane will turn eastward. • The paper airplane will not turn.

4. The amount of momentum an object has depends on its _________. • mass and velocity • shape and velocity • mass and weight • size and shape

5. On a highway, a tractor trailer must keep a long distance from the vehicle it is following. A small car traveling at the same speed does not have to keep such a long distance from the vehicle it is following. Why is this true? • The tractor trailer has less mass than the car, thus it is easier to stop. • The tractor trailer has more mass than the car, thus it is harder to stop. • The tractor trailer has less momentum than the car, thus it is harder to stop • The tractor trailer has less mass than the car, thus it is harder to stop.

6. The tendency of a resting object to stay at rest and a moving object to stay in motion is called: • inertia • force • acceleration • gravity

7. Jane complains to her dad that she seems to move slower down her playground slide than she did several weeks ago. Her dad applies some car wax to the metal surface of the slide and Jane can now move faster down the slide. How can you best explain this observation? • The wax increased the force of friction on the slide. • The wax decreased the force of friction on the slide. • The wax decreased the force of gravity on the slide. • The wax increased the force of gravity on the slide.

8. Gary balanced his pencil on the back of his chair. Which of the following is true? • The pencil must fall off the chair eventually, due to gravity. • If no outside force is applied to the pencil or the chair, then the pencil will fall down. • If the pencil falls off the chair, this means an outside force was applied. • The pencil must be magnetically attracted to the chair.

9. Jim wants to measure the speed of a ball rolling down a wooden board for his science project. However, the ball rolls too fast for him to measure precisely. Which of the following procedures would have he greatest effect in slowing down the ball so that Jim can measure the speed better? • decreasing the slope of the board • raising the slope of the board • putting wax on the board’s surface • sanding the surface of the board

10. Which of the following will go faster? • a ball rolling down a hill at a 60-degree angle • a ball sitting on ground level • a ball rolling down a hill at a 30-degree angle • a ball falling from a building the same heigh as the hill

11. You construct hills of the same slope from several materials and slide a brick down each of them. Upon which one will the brick slide slowest? • a hill made of glass • a hill made of waxed metal • a hill made of concrete • a hill made of waxed wood