Force and Motion

What slows down the motion of an object or keeps it from starting?

• mass
• friction
• gravity
• magnetism

What does force allow a ball player to do?

• To swing a baseball bat and hit a ball in a same direction
• To swing a baseball bat and drop a ball in a new direction
• To swing a baseball raquet and hit a ball in a new direction
• To swing a baseball bat and hit a ball in a new direction

What is the effect of increasing the mass of an object on its acceleration, assuming the force applied is constant?

• Acceleration decreases

• Acceleration increases

• Acceleration becomes zero

• Acceleration remains the same

What is the difference between mass and weight?

• mass is how much matter is in an object, and weight is the gravitational pull on that object
• mass and weight are the same
• weight affects how much mass is in an object
• weight is determined by how many atoms make up an object

A ball is rolled on four different types of materials.  Which material will cause the least amount of friction between it and the ball?

• Tile Floor
• Carpet
• Grass
• Cement Sidewalk 

What pulls a ball back to earth?

• Gas
• Gravity
• Friction
• Molecules

How is gravity affected by mass?

• the larger the mass of the object, the greater the gravity
• small objects have no gravity
• gravity is not affected by mass of objects, whether large or small

If these boys are pulling with the same amount of force.  What will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

A train that travels 100 kilometers in 4 hours is traveling at what average speed? Remember: Speed= distance/time

• 50 km/h
• 100 km/h
• 400 km/h
• 25 km/h

Why does a crumpled piece of paper land before a flat sheet of paper? 

• Gravity exerts more force on the crumpled paper. 
• There is more air resistance on the flat paper. 
• The crumpled paper is heavier
• The flat paper is lighter.