Forces Unit Mastery

______________ is when an object bends or changes shape.

• Injury
• Deformation
• Collision
• Force

All solid objects deform when pushed on in a collision and when other contact forces are applied to them.

• True
• False

Force is measured in ____________

• Pounds (lb)
• Centimeters (cm)
• Grams (g)
• Newtons (N)

Which variable has the greatest effect on an object’s kinetic energy? (Hint: What is Kinetic Energy?)

• The object’s shape
• The object’s speed
• The object’s mass
• The object's material

What does friction do to moving objects?

• It causes the object to cool down
• It causes the object to speed up
• It causes the object to slow down
• It has no effect on the object

What is true about the forces and the motion on the box below?

• The forces are balanced and the box will accelerate to the left
• The forces are unbalanced and the box will accelerate to the left
• The forces are unbalanced and the box will accelerate to the right
• The forces are unbalanced and the box will move at a constant speed to the right

The amount force that a baseball bat exerts on a ball is 50 newtons. What is the amount the force that the ball exerts on the bat?

• 5N
• 10N
• 25N
• 50N

If you apply the same force to a basketball and a bowling ball, why does the basketball accelerate more?

• The basketball has less mass than the bowling ball.
• The basketball has more gravity than the bowling ball.
• The basketball has more mass than the bowling ball.
• The force acts differently on each object because of their shape.

A swimmer pushes backward against the water with their arms. What is the reaction force?

• The water pulls the swimmer down.
• The water pushes the swimmer forward.
• The swimmer moves backward.
• There is no reaction force.

When 20,000 N of force is applied to this material, it’s deformation is approximately:

• 0.00 cm
• 0.05 cm
• 0.08 cm
• 0.10 cm