Speed, Mass, and KE
First Law
Second Law
Third Law
Name that law!
100
What is the equation for speed?
S = D/t
Speed = Distance / time
100
Complete the following: An object in motion stays in motion, and an object at rest stays at _________, until acted on by an unbalanced force.
Rest
100
What is the equation that defines Newton's 2nd Law?
F = ma
Force = mass x acceleration
100
Complete the definition: For every action, there is an equal and _________ reaction.
Opposite
100
A pencil resting on a table is pulled by gravity onto the table, and the table pushes with a normal force up against the pencil.
Newton's 3rd Law
200
What is the equation for kinetic energy?
KE = 1/2 * m * v2
Kinetic energy = 1/2 * mass * velocity2
200
What type of force is required for an object to move?
Unbalanced force
200
When forces are equal and opposite, a larger mass will have more or less acceleration?
Less acceleration
200
You dribble a basketball. According to Newton's 3rd Law, why does the ball bounce back up off the floor?
The floor pushes up on the ball.
200
The harder you hit a baseball, the faster it accelerates.
Newton's 2nd Law
300
When mass increases, kinetic energy ________.
Increases
300
This word describes an object's resistance to a change in motion. Newton's First Law is also called the Law of __________.
Inertia
300
Football A has a greater mass than football B. Which football will have greater acceleration when both are thrown with the same force in the same direction?
Football B
300
A baseball bat hits a baseball with a force of 100 Newtons. What is the force exerted by the ball on the bat?
100 N in the opposite direction
300
A sedan accelerates faster than a school bus.
Newton's 2nd Law
400
A sprinter travels 100 m in 16 seconds. What is their speed?
6.25 m/s
400
Which object has more inertia: a bowling ball or a tennis ball?
Bowling ball
400
A sports car and a dump truck are at a red light. If both drivers press on the gas pedal with equal force when the light turns green, which car will accelerate faster?
Sports car
400
A 18-wheeler collides with a minivan. True or false: are the forces equal in the collision?
True
However, because of the mass difference, the kinetic energy and acceleration will not be equal.
400
You push on a wall and the wall pushes back on you.
Newton's 3rd Law
500
A volleyball player spikes a 0.25 kg ball over the net at a speed of 24 m/s. What is the kinetic energy of the ball?
144 J
500
In which direction will the box move, if it moves at all?
In the direction of the unbalanced force (to the left)
500
Someone is pushing a bike up a hill with the same force as someone pushing a car up a hill. Which vehicle will experience more acceleration?
The bicycle
500
An ice skater pushes off a wall and glides backwards for a few meters and then stops.
What best describes an action-reaction force pair in this statement?
Action: The ice skater pushes off a wall
Reaction: The wall pushes back on the ice skater
500
Your body moves forward and is stopped by the seatbelt when your car stops suddenly.
Newton's 1st Law