Forces & Motion Forces & Motion QuestionsQuestions

Reviewing the Unit Reviewing the Unit

Which of the following has the most Which of the following has the most momentum?momentum?

a)a)A 20-kilogram ball at restA 20-kilogram ball at rest

b)b)A 5-kilogram ball rolling at 4 A 5-kilogram ball rolling at 4 meters per secondmeters per second

c)c)A 10-kilogram ball rolling at 2 A 10-kilogram ball rolling at 2 meters per secondmeters per second

d)d)A 10-kilogram rolling at 4 meters A 10-kilogram rolling at 4 meters per secondper second

Cindy is at the park. She throws a paper Cindy is at the park. She throws a paper airplane northward. There is a strong airplane northward. There is a strong wind blowing from West to East. What wind blowing from West to East. What will most likely happen?will most likely happen?

a)a)The paper airplane will turn southward.The paper airplane will turn southward.

b)b)The paper airplane will turn westward.The paper airplane will turn westward.

c)c)The paper airplane will turn eastward.The paper airplane will turn eastward.

d)d)The paper airplane will not turn.The paper airplane will not turn.

The amount of momentum an object The amount of momentum an object has depends on its _________.has depends on its _________.

a)a)mass and velocitymass and velocity

b)b)shape and velocityshape and velocity

c)c)mass and weightmass and weight

d)d)size and shapesize and shape

On a highway, a tractor trailer must keep a On a highway, a tractor trailer must keep a long distance from the vehicle it is long distance from the vehicle it is following. A small car traveling at the same following. A small car traveling at the same speed does not have to keep such a long speed does not have to keep such a long distance from the vehicle it is following. distance from the vehicle it is following. Why is this true?Why is this true?

a)a)The tractor trailer has less mass than the The tractor trailer has less mass than the car, thus it is easier to stop.car, thus it is easier to stop.

b)b)The tractor trailer has more mass than the The tractor trailer has more mass than the car, thus it is harder to stop.car, thus it is harder to stop.

c)c)The tractor trailer has less momentum than The tractor trailer has less momentum than the car, thus it is harder to stopthe car, thus it is harder to stop

d)d)The tractor trailer has less mass than the The tractor trailer has less mass than the car, thus it is harder to stop.car, thus it is harder to stop.

The tendency of a resting object to The tendency of a resting object to stay at rest and a moving object stay at rest and a moving object to stay in motion is called:to stay in motion is called:

a)a)inertiainertia

b)b)forceforce

c)c)accelerationacceleration

d)d)gravitygravity

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

a)a)The wax increased the force of friction on the The wax increased the force of friction on the slide.slide.

b)b)The wax decreased the force of friction on the The wax decreased the force of friction on the slide.slide.

c)c)The wax decreased the force of gravity on the The wax decreased the force of gravity on the slide.slide.

d)d)The wax increased the force of gravity on the The wax increased the force of gravity on the slide.slide.

Gary balanced his pencil on the back of Gary balanced his pencil on the back of his chair. Which of the following is his chair. Which of the following is true?true?

a)a)The pencil must fall off the chair The pencil must fall off the chair eventually, due to gravity.eventually, due to gravity.

b)b)If no outside force is applied to the If no outside force is applied to the pencil or the chair, then the pencil will pencil or the chair, then the pencil will fall down.fall down.

c)c)If the pencil falls off the chair, this If the pencil falls off the chair, this means an outside force was applied.means an outside force was applied.

d)d)The pencil must be magnetically The pencil must be magnetically attracted to the chair.attracted to the chair.

Jim wants to measure the speed of a Jim wants to measure the speed of a ball rolling down a wooden board for ball rolling down a wooden board for his science project. However, the ball his science project. However, the ball rolls too fast for him to measure rolls too fast for him to measure precisely. Which of the following precisely. Which of the following procedures would have he greatest procedures would have he greatest effect in slowing down the ball so that effect in slowing down the ball so that Jim can measure the speed better?Jim can measure the speed better?

a)a)decreasing the slope of the boarddecreasing the slope of the board

b)b)raising the slope of the boardraising the slope of the board

c)c)putting wax on the board’s surfaceputting wax on the board’s surface

d)d)sanding the surface of the boardsanding the surface of the board

Which of the following will go faster?Which of the following will go faster?

a)a)a ball rolling down a hill at a 60-a ball rolling down a hill at a 60-degree angledegree angle

b)b)a ball sitting on ground levela ball sitting on ground level

c)c)a ball rolling down a hill at a 30-a ball rolling down a hill at a 30-degree angledegree angle

d)d)a ball falling from a building the a ball falling from a building the same heigh as the hillsame heigh as the hill

You construct hills of the same slope You construct hills of the same slope from several materials and slide a from several materials and slide a brick down each of them. Upon brick down each of them. Upon which one will the brick slide which one will the brick slide slowest?slowest?

a)a)a hill made of glassa hill made of glass

b)b)a hill made of waxed metala hill made of waxed metal

c)c)a hill made of concretea hill made of concrete

d)d)a hill made of waxed wooda hill made of waxed wood